A successful bathroom begins with circulation, water control, ventilation, lighting, and storage—not a finish palette.

Bathroom planning is a chain of connected decisions. A change to the layout can affect plumbing, electrical work, waterproofing, cabinetry, tile, glass, ventilation, and the construction sequence.

Quick Answer: How Should You Plan a Mercer Island Bathroom?

A well-planned bathroom should be designed in this order:

1. Identify who will use the room.
2. Define what is wrong with the existing bathroom.
3. Solve the layout before selecting finishes.
4. Decide which plumbing fixtures truly need to move.
5. Separate wet, transitional and dry zones.
6. Plan the shower waterproofing system before choosing tile.
7. Size and locate mechanical ventilation properly.
8. Coordinate vanity, mirrors, lighting and electrical locations.
9. Design storage around daily routines.
10. Select tile and materials for water exposure, grip and maintenance—not appearance alone.
11. Add luxury features only after the basic room works.
12. Confirm Mercer Island permit and trade requirements before construction.

The most common planning mistake is starting here:

marble → faucet finish → tile color → freestanding tub

when the project should start here:

users → movement → water → ventilation → structure → storage

A luxurious bathroom that is awkward to use, difficult to dry or difficult to maintain is not well designed.

Mercer Island Bathroom Planning Checklist

Before approving the design, answer these questions.

1. Start With the People, Not the Fixtures

A bathroom used by one person has different priorities from a primary bathroom used simultaneously by two people. Before drawing the room, identify the users. Ask:

• Who gets ready first?
• Does someone shower while another uses the vanity?
• How much countertop space is needed?
• Is privacy important around the toilet?
• Does one person need more storage?
• Is makeup or grooming lighting important?
• Is mobility likely to change in the future?

The current NKBA planning framework emphasizes activity centers and the tasks performed within them rather than treating kitchens and bathrooms as collections of fixtures. (NKBA)

Planning Principle

Design around activities before designing around objects. A double vanity is not automatically better than a large single vanity. A freestanding tub is not automatically better than additional shower or storage space. Every feature should earn its footprint.

2. Write Down What the Existing Bathroom Gets Wrong

Do not begin the project with:

“We want a luxury bathroom.”

That describes an aesthetic ambition, not a functional problem. Instead list the specific frustrations. For example:

• shower feels cramped;
• vanity storage is poor;
• toilet has no privacy;
• door swing is awkward;
• towels have nowhere logical to go;
• bathroom stays humid too long;
• lighting creates shadows;
• tub is never used;
• shower has no practical storage;
• grout requires too much maintenance;
• cold floor is uncomfortable;
• two users interfere with each other.

Once the problems are explicit, the design can solve them intentionally.

3. Solve the Layout Before Selecting Tile

Layout decisions affect nearly everything that follows: layout ↓ plumbing ↓ electrical ↓ lighting ↓ waterproofing ↓ cabinetry ↓ tile ↓ glass ↓ accessories Changing a layout after fixtures and finishes have been ordered creates avoidable compromises. The updated NKBA planning guidelines specifically address clear floor space, passageways, fixtures, cabinetry, storage, lighting, building systems and accessibility as coordinated planning issues. (NKBA)

4. Evaluate the Bathroom as Activity Zones

A useful bathroom can be divided conceptually into activity zones.

Vanity Zone

Used for:

• handwashing;
• shaving;
• makeup;
• hair;
• medications;
• daily grooming.

It needs:

• countertop space;
• accessible storage;
• mirror;
• task lighting;
• electrical access.

Shower / Bath Zone

Used for:

• bathing;
• drying;
• storing shower products;
• towels.

It needs:

• water containment;
• waterproofing;
• drainage;
• ventilation;
• safe footing.

Toilet Zone

Needs:

• comfortable access;
• privacy where desired;
• easy cleaning.

Storage Zone

Needs space for:

• towels;
• toiletries;
• backup supplies;
• cleaning items;
• personal-care appliances.

Design Test

Walk mentally through the bathroom from the moment you enter until you leave. Where does each activity happen? What do you reach for? Where does it live? That exposes layout problems far earlier than a finish board does.

5. Keep Plumbing Locations Unless Moving Them Solves a Real Problem

Moving plumbing can be justified. It just should not happen automatically. Before relocating a:

• toilet;
• shower;
• bathtub;
• vanity;

ask:

What specific functional problem does this move solve?

Good answers include:

• creating a significantly larger shower;
• separating the toilet from the vanity;
• eliminating a poor door conflict;
• creating better accessibility;
• improving circulation.

A weak answer is:

“It looks nicer on the rendering.”

Planning Principle

Every major fixture relocation should buy a meaningful improvement in function.

6. Check the Structure Before Designing Around a Perfect Rendering

A floor plan can look effortless on paper. The existing house may contain:

• floor framing;
• beams;
• plumbing stacks;
• supply lines;
• electrical;
• HVAC;
• exterior walls;
• windows;

that affect how easily that plan can be built. That does not mean the layout cannot change. It means design and construction feasibility need to develop together. Mercer Island distinguishes non-structural interior remodeling from structural interior remodeling involving elements such as beams, posts or lateral-resistance systems. (Mercer Island, Washington)

Better Planning Question

What is behind, below and above the fixture we want to move?

7. Decide Early: Do You Actually Need a Bathtub?

A bathtub uses substantial floor area. Do not include one automatically because:

“Luxury bathrooms are supposed to have tubs.”

Ask:

• Does anyone actually take baths?
• Is another tub available elsewhere in the house?
• Would a larger shower be used more often?
• Would additional storage be more valuable?
• Does the tub improve or compromise circulation?

A tub may absolutely belong in the plan. But it should be included because it serves the household—not because it appears on a luxury-bathroom checklist.

8. Plan the Shower Around How It Will Be Used

A luxury shower is not simply a large rectangle covered in expensive tile. Consider:

• entry location;
• door or glass panel;
• water spray;
• showerhead position;
• handheld location;
• controls;
• bench;
• niche;
• towel access;
• drain;
• lighting;
• ventilation;
• cleaning access.

One Often-Missed Detail

Can the user turn the shower on without standing directly beneath cold water? Small operational details often determine whether an expensive bathroom feels genuinely customized.

9. Curbless Showers Need to Be Planned Early

A curbless shower can provide:

• visual continuity;
• easier access;
• cleaner circulation;
• stronger long-term accessibility.

But eliminating the curb changes the relationship between:

• shower floor;
• bathroom floor;
• drain;
• waterproofing;
• framing.

This is therefore not merely a glass-door decision made late in construction. The NKBA’s current guidelines place greater emphasis on accessibility, floor surfaces, backing, waterproofing and integrated planning. (NKBA)

Planning Principle

If curbless access matters, decide it during layout and floor-system planning, not after tile installation begins.

10. Separate Wet, Transitional and Dry Areas

Not every bathroom surface receives the same amount of water. Think in three zones.

Wet Zone

Examples:

• shower floor;
• shower walls;
• tub/shower surround.

Priorities:

• waterproofing;
• drainage;
• compatible substrate;
• appropriate tile system.

Transitional Zone

Examples:

• floor immediately outside shower;
• tub approach;
• vanity backsplash.

Priorities:

• moisture tolerance;
• cleaning;
• slip resistance;
• durable transitions.

Dry Zone

Examples:

• upper painted walls;
• cabinetry areas away from direct water.

Priorities:

• humidity resistance;
• durability;
• appearance.

Why This Helps

It prevents homeowners from treating every material as though it needs the same performance characteristics.

11. Tile Is Not the Waterproofing System

This is one of the most important bathroom-planning principles. The Tile Council of North America specifically notes that grout joints are not waterproof and that wet areas such as showers rely on the installation method and substrate to protect adjoining construction from water. (Tile Council of North America) TCNA also publishes standards and recognized methods for waterproof membranes and tiled shower assemblies. (Tile Council of North America)

Direct Answer

The tile is the finish. The waterproofing system protects the building. Do not approve a shower specification that tells you only:

porcelain tile + grout color

You also need to understand the assembly beneath it.

12. Ask What Waterproofing System Is Being Used

A shower specification should identify enough information to understand:

• shower base;
• wall substrate;
• membrane;
• drain;
• corners;
• niches;
• benches;
• penetrations;
• transitions.

There are different recognized shower-construction methods. The important point for the homeowner is that the components should work as one compatible water-management system, not as unrelated products assembled casually. TCNA provides current standards covering bonded waterproof membranes and shower assemblies. (Tile Council of North America)

Better Question

Instead of:

“Is the shower waterproof?”

ask:

“What is the complete waterproofing method from the drain to the walls, niches, curb or curbless transition?”

13. Waterproofing Details Become Harder Around Luxury Features

Every interruption deserves planning. Examples:

• recessed niche;
• shower bench;
• linear drain;
• multiple body sprays;
• wall-mounted controls;
• steam equipment;
• large glass panels.

Luxury often creates more interfaces, not fewer. The design should therefore become more technically coordinated as features are added.

Luxury Rule

The more complicated the shower becomes, the more important the hidden details become.

14. Ventilation Is a Design Feature, Not an Afterthought

Bathrooms generate concentrated moisture. Washington’s current residential code requires local exhaust systems in bathrooms and toilet rooms. The current minimum exhaust capacities are 50 cfm for intermittent operation or 20 cfm for continuous operation, with controls that can include manual controls, timers, humidity sensors or occupancy/similar automatic controls. (Washington State Legislature) That is the minimum-code conversation. The design conversation should go further. Ask:

• Where is the fan?
• How long is the duct route?
• Where does it terminate?
• How noisy is the fan?
• Will users actually operate it?
• Would humidity-sensing or timer control help?
• Is the room unusually large or compartmentalized?

Important Distinction

A large bathroom does not automatically become well ventilated because someone installed an expensive fan. The entire exhaust path matters.

15. Fan Location Matters

Moisture is generated most intensely around:

• showers;
• tubs;
• enclosed bathing zones.

A fan located far from the primary moisture source may not perform as effectively as a thoughtfully coordinated layout. For bathrooms divided into separate compartments, ventilation planning becomes even more important.

Planning Question

Where is moisture generated, and how does it get from there to the exhaust point?

That is more useful than choosing the fan grille by appearance.

16. Quiet Ventilation Is More Likely to Be Used

A technically adequate fan that homeowners avoid because it is loud is not a great user experience. When comparing fans, look beyond airflow. Consider:

• sound rating;
• controls;
• duct configuration;
• accessibility for future cleaning.

Luxury bathroom design should include quiet building systems, not just premium visible materials.

17. Do Not Rely on a Window Instead of Planning Mechanical Ventilation

Washington’s residential code routes bathroom ventilation requirements through the mechanical local-exhaust provisions rather than treating an operable window as the basic substitute. (Washington State Legislature) A window can still improve:

• daylight;
• view;
• natural air movement.

But it is not a reason to ignore mechanical moisture control.

18. Lighting Should Be Designed in Layers

A single ceiling fixture rarely handles every bathroom task well. Think in layers.

General Lighting

Provides overall illumination.

Vanity / Task Lighting

Supports:

• shaving;
• makeup;
• skincare;
• grooming.

Shower Lighting

Provides safe, usable illumination in the bathing zone.

Accent / Ambient Lighting

May include:

• wall washers;
• decorative pendants;
• under-vanity lighting;
• niche lighting;
• indirect lighting.

NKBA’s updated guidelines specifically expand lighting and lighting-control planning as part of bathroom building-systems coordination. (NKBA)

19. Coordinate the Vanity Before Finalizing Lighting

The dependency chain should be: vanity → sink → faucet → mirror → lighting → electrical locations Not: electrician roughs in boxes → homeowner later chooses mirror This is especially important with:

• oversized mirrors;
• LED mirrors;
• medicine cabinets;
• wall-mounted faucets;
• sconces.

A few inches can determine whether the finished composition looks intentional.

20. Plan Electrical Needs Before Ordering the Vanity

Think about everything that may need power:

• hair dryer;
• electric toothbrush;
• shaver;
• illuminated mirror;
• bidet seat;
• heated flooring;
• towel warmer;
• smart controls.

Do not try to find electrical locations after millwork has already been fabricated.

CHC Project Insight

The most expensive bathroom decisions are often the ones hidden behind finished surfaces. A fixture that needs power, plumbing, blocking or drainage should be selected early enough for the rough work to be coordinated.

21. Storage Should Be Designed Around Activities

The goal is not:

maximum cabinet volume

The goal is:

accessible storage that keeps frequently used surfaces clear

List what needs to be stored.

Daily

• toothbrush;
• skincare;
• makeup;
• grooming equipment;
• medication.

Weekly

• towels;
• extra toiletries;
• hair appliances.

Backup

• paper products;
• cleaning supplies;
• bulk products.

Now assign each category a home.

22. Drawers Often Work Better for Daily Vanity Storage

Deep vanity cabinets can become storage caves. Drawers can make:

• small products;
• cosmetics;
• grooming equipment;
• spare supplies;

easier to access. That does not mean every cabinet should become a drawer. It means cabinet configuration should follow what will be stored.

23. Use Vertical Space Intentionally

A bathroom can contain substantial unused vertical volume. Possible solutions include:

• medicine cabinets;
• linen towers;
• recessed storage;
• tall cabinetry;
• shelving.

But more storage is not automatically better. Avoid making a bathroom feel crowded simply because there is an empty wall.

Better Rule

Add storage where people naturally reach for things.

24. Plan the Medicine Cabinet Before Framing Is Finished

Recessed medicine cabinets can interact with:

• studs;
• electrical wiring;
• plumbing;
• vent ducts;
• exterior-wall insulation.

If you want a large recessed cabinet, determine its location early. The same principle applies to shower niches.

25. Choose Bathroom Floor Tile for Feet, Water and Maintenance

Bathroom floor tile is not simply decorative. Ask:

• How does it perform when wet?
• What is the surface texture?
• How many grout joints will there be?
• Is it comfortable underfoot?
• How difficult is it to clean?
• Will heated flooring be installed?

The NKBA fifth edition expanded its interior-environment guidance to include flooring surfaces and tile slip ratings alongside material performance and accessibility. (NKBA)

Planning Principle

Do not select a bathroom floor solely because the polished showroom sample looks luxurious. A floor is something you stand on barefoot when water is present.

26. Large-Format Tile: Understand the Real Benefit

Large-format tile can create:

• fewer grout joints;
• broad visual continuity;
• cleaner-looking surfaces.

But larger tile also increases the importance of:

• substrate flatness;
• layout;
• cuts;
• transitions;
• installation workmanship.

For shower floors, drain geometry and required slope can affect whether a particular tile size is practical.

Better Question

Does this tile size work with the geometry of this specific surface?

Not simply:

“Are large tiles more luxurious?”

27. Small Tile Still Has a Place

Mosaics and smaller tile can make sense:

• on shower floors;
• around curves;
• in niches;
• as intentional accent areas.

The trade-off is usually more grout. If maintenance is a high priority, decide where that visual detail is worth the additional joints.

28. Natural Stone Requires a Different Maintenance Conversation

Natural stone can create exceptional depth and variation. But a homeowner should understand:

• material porosity;
• finish;
• cleaning requirements;
• sealing recommendations where applicable;
• sensitivity to certain cleaners;
• variation between pieces.

Do not choose natural stone because it looks expensive. Choose it because you genuinely value the material enough to accept its care requirements.

29. Porcelain Can Be a Strong Performance-First Choice

Porcelain products are available in an enormous range of appearances, including products designed to resemble:

• marble;
• limestone;
• wood;
• concrete.

The choice between porcelain and natural stone should not be framed as:

cheap vs. luxury

The more useful comparison is: appearance + maintenance + installation + performance + homeowner preference

30. Grout Color Changes the Room More Than Many Homeowners Expect

Grout can:

• disappear into the tile;
• emphasize every tile;
• turn the layout into a graphic pattern.

Before approving grout color, decide whether the design intent is:

Quiet Surface

Tile and grout are close in tone.

Graphic Surface

Grout deliberately contrasts with the tile. Also consider future cleaning expectations before choosing an extremely light grout in a heavily used floor or shower application.

31. The Best Luxury Bathroom Features Solve Problems

Luxury should improve the experience. Strong candidates can include:

• heated floors;
• curbless shower;
• larger shower;
• improved shower controls;
• handheld shower;
• bench;
• high-quality storage;
• towel warmer;
• bidet toilet;
• better lighting;
• quiet ventilation;
• custom vanity;
• thoughtfully positioned outlets.

Luxury Principle

Luxury is not the number of features. It is how effortlessly the bathroom works.

32. Heated Flooring: Plan It Before Tile

Heated floors can provide noticeable comfort in a bathroom. But the decision should be made before:

• electrical rough-in;
• floor build-up;
• tile installation.

Consider:

• heating system;
• thermostat location;
• floor assembly;
• transitions to adjacent rooms.

A heating system added after the tile plan is already fixed can complicate an otherwise simple detail.

33. Towel Warmers Need More Planning Than Their Size Suggests

A towel warmer can require coordination with:

• electrical;
• wall blocking;
• towel reach;
• door movement;
• cabinetry.

Ask:

Where will someone stand after leaving the shower, and can they reach the towel without crossing the bathroom wet?

That is the kind of detail that makes luxury functional.

34. Bidet Toilets Need Early Coordination

Depending on the selected product, a bidet toilet or seat can require:

• water supply;
• electrical power;
• specific clearances.

Do not select it after rough-in is complete. If it is part of the desired bathroom, treat it as an early planning item.

35. Steam Showers Are a Different Level of Wet-Area Planning

A steam shower is not merely:

regular shower + steam generator

It can affect:

• enclosure;
• waterproofing/vapor-management system;
• ceiling;
• glass;
• mechanical equipment;
• electrical;
• plumbing;
• controls.

If steam is being considered, introduce it at the beginning of wet-area design. Do not convert a finished conventional shower concept into a steam shower late in the project.

36. Freestanding Tubs Need Space Around Them

A freestanding tub can look excellent in a large room. But ask:

• Can you clean behind it?
• Can you clean beside it?
• Is the filler location practical?
• Can someone enter and exit safely?
• Does the tub block circulation?
• Is a large amount of floor space being sacrificed for a rarely used fixture?

Design Test

Do not evaluate the tub only from the doorway. Evaluate the bathroom while someone is actually using it.

37. Wall-Mounted Faucets Need Precision

Wall-mounted faucets can create a clean visual result. They also require early coordination of:

• rough plumbing;
• finished wall thickness;
• sink location;
• backsplash;
• mirror;
• vanity height.

A small positioning mistake can be visually obvious.

Decision Chain

sink → faucet reach → wall finish → mirror → plumbing rough-in Lock those relationships before the wall closes.

38. Linear Drains Should Follow the Shower Design

Linear drains can support certain:

• curbless designs;
• large-format tile layouts;
• contemporary aesthetics.

But drain selection should follow:

• shower geometry;
• slope strategy;
• waterproofing method;
• structural conditions.

Do not select a linear drain simply because it photographs well. It is a drainage component first.

39. Frameless Glass Still Needs Practical Planning

Before specifying shower glass, identify:

• door swing;
• fixed panels;
• hardware;
• towel location;
• nearby vanity;
• ceiling conditions;
• curb or curbless condition;
• shower spray direction.

A beautiful glass door that collides with:

• toilet;
• vanity;
• towel bar;

is a layout error, not a luxury feature.

40. Privacy Should Be Designed, Not Added Later

Primary bathrooms increasingly contain open layouts. But openness is not automatically comfortable. Consider privacy around:

• toilet;
• shower;
• windows;
• entry sightlines.

Possible solutions include:

• partial walls;
• toilet compartments;
• frosted glass;
• strategic cabinetry;
• carefully positioned doors.

Useful Question

From the bedroom or hallway:

What is the first thing someone sees when the bathroom door opens?

41. Natural Light Is Valuable, but So Is Privacy

Windows can dramatically improve a bathroom. But evaluate:

• sightlines from neighboring properties;
• landscape;
• tub/shower locations;
• glass type;
• window treatment;
• ventilation strategy.

Natural light and privacy should be solved together.

42. Plan for Nighttime Use

A bathroom can have excellent daytime lighting and still be uncomfortable at 2 a.m. Consider lower-level nighttime lighting such as:

• under-vanity illumination;
• low-level wall lighting;
• dimmable fixtures.

The goal is safe movement without activating every bright task light.

43. Universal Design Does Not Have to Look Institutional

Future-ready features can be incorporated quietly. Examples include:

• curbless access;
• more generous movement space;
• strategically placed wall blocking;
• handheld shower;
• easy-to-operate controls;
• accessible storage;
• comfortable floor surfaces.

NKBA’s fifth edition specifically incorporates broader accessible-design recommendations, mobility-aid planning, clear-floor-space concepts, wall backing and universal-design principles. (NKBA)

Planning Insight

It is easier to provide hidden wall backing during a remodel than to open a finished tiled wall later. Future flexibility can therefore be built into the room without making it look clinical.

44. Water Efficiency Can Be Luxurious Too

Performance does not require waste. EPA WaterSense resources cover water-efficient:

• toilets;
• bathroom sink faucets;
• showerheads;

along with leak reduction and other residential water-efficiency strategies. (US EPA) When choosing fixtures, compare:

• water performance;
• spray experience;
• controls;
• maintenance;
• availability of replacement components.

Better Question

Do not ask only:

“Is this a luxury fixture?”

Ask:

“Will this fixture still provide the experience we want while using water responsibly?”

45. Design Around Maintenance Tolerance

A truly customized bathroom matches the homeowner’s maintenance tolerance as well as aesthetic taste. Two homeowners can love the same inspiration photo and need different material specifications.

Low-Maintenance Priorities May Favor

• fewer grout joints;
• simpler glass;
• accessible surfaces;
• practical storage;
• materials with straightforward cleaning requirements.

Design-Driven Priorities May Accept

• natural stone;
• extensive glass;
• mosaics;
• detailed metalwork;

with the understanding that those materials may require more care. There is no correct answer. There is only an informed one.

46. Do Not Create Cleaning Traps

Look closely at:

• tiny spaces between tub and wall;
• narrow gaps beside vanities;
• inaccessible glass corners;
• floor-mounted tub fillers;
• toilets squeezed against cabinetry;
• open shelves directly beside wet zones.

Planning Principle

If you cannot reach it, you cannot clean it easily. Evaluate the bathroom in use, not just at rest.

47. Mercer Island Bathroom Permits: Check Scope Early

Mercer Island currently identifies non-structural interior remodels—including bathroom remodels—as residential building-permit project types. Structural interior remodeling is treated separately. (Mercer Island, Washington) The City’s current simple-project process calls for construction documents that clearly identify the area of work and provide enough information to demonstrate applicable code compliance. Simple residential permits are currently submitted electronically; the City’s page also notes that its former OTC reviews are not currently available. (Mercer Island, Washington)

Important

Permit scope can change when your project involves:

• structural modifications;
• additional plumbing fixtures;
• broader repiping;
• electrical work;
• mechanical ventilation work;
• changes beyond the basic interior remodel.

For example, Mercer Island’s current simple-project documentation specifically requires a water-meter sizing worksheet when additional plumbing fixtures are added or when more than one bathroom or kitchen is being repiped. (Mercer Island, Washington)

Do Not Assume

“It’s only a bathroom, so no permit planning is needed.”

Determine the actual scope first.

48. Decide What Needs to Be Known Before Demolition

Some selections can wait. Others should not.

High-Priority Pre-Demolition Decisions

1. Layout

Where do the major fixtures go?

2. Shower / Tub

What are the actual sizes and rough requirements?

3. Plumbing Fixtures

Especially:

• wall-mounted fixtures;
• shower valves;
• body sprays;
• bidet systems.

4. Electrical Features

Including:

• heated floors;
• towel warmer;
• mirrors;
• lighting;
• bidet power.

5. Waterproofing Strategy

Especially when designing:

• curbless shower;
• niches;
• benches;
• steam.

6. Vanity

Dimensions affect plumbing, electrical, mirrors and lighting.

Planning Insight

Do not begin demolition merely because the tile has been selected. The decisions behind the tile matter more.

49. Some Decisions Should Wait Until Existing Conditions Are Visible

Planning should be thorough, but remodeling still involves an existing building. Once demolition occurs, previously hidden conditions may become visible. Examples can include:

• damaged framing;
• old plumbing;
• wiring conditions;
• water damage;
• uneven substrate.

The right strategy is not pretending hidden conditions cannot exist. It is creating a process for:

1. identifying them;
2. documenting them;
3. evaluating their impact;
4. approving changes before additional work proceeds.

50. Plan the Correct Construction Sequence

A useful conceptual sequence is: scope ↓ layout ↓ permit/design coordination ↓ demolition ↓ existing-condition review ↓ framing/blocking ↓ plumbing/electrical/mechanical rough-in ↓ inspection where required ↓ wet-area preparation/waterproofing ↓ tile ↓ cabinetry/fixtures ↓ glass ↓ finish electrical/plumbing ↓ final details Exact sequencing varies by project. The important point is that finished materials should not conceal work that still needs coordination or inspection.

Luxury Bathroom Feature Decision Table

Planning by Bathroom Type

Primary Bathroom

Prioritize:

• two-person use;
• privacy;
• shower experience;
• meaningful storage;
• lighting;
• comfort;
• future accessibility.

Do not assume a tub is mandatory.

Small Full Bathroom

Prioritize:

• circulation;
• storage efficiency;
• door conflict;
• appropriate fixture scale;
• visual simplicity;
• moisture control.

In a small bathroom, every inch needs a job.

Guest Bathroom

Prioritize:

• intuitive use;
• easy maintenance;
• durable materials;
• accessible towel storage;
• uncomplicated controls.

Guests should not need instructions to operate the room.

Powder Room

Prioritize:

• vanity;
• lighting;
• mirror;
• visual character.

Because there is no shower-generated moisture, the material strategy can be different from a full bathroom.

Bathroom Material Selection Guide

12 Questions to Ask Before Approving the Bathroom Design

1. What problems does this new layout actually solve?

Every major move should have a reason.

2. Can two intended users move through the room comfortably?

Test real routines.

3. Can every drawer and door open without a collision?

Include:

• vanity drawers;
• bathroom door;
• shower door;
• toilet area.

4. Is the toilet placed where we want it visually?

Check doorway and bedroom sightlines.

5. Where do wet towels go?

This tiny detail exposes surprisingly many layout problems.

6. What waterproofing method is being specified?

The answer should involve more than grout.

7. How is bathroom exhaust being handled?

Washington requires bathroom local exhaust; current residential provisions specify at least 50 cfm intermittent or 20 cfm continuous for bathrooms/toilet rooms. (Washington State Legislature)

8. Have vanity, mirrors, lighting and outlets been coordinated?

Check the complete elevation.

9. Which materials require ongoing maintenance?

Understand them before purchasing.

10. Which “luxury” features will we actually use?

Do not sacrifice function for feature count.

11. What code/permit issues need to be resolved before construction?

Mercer Island specifically lists bathroom remodels within its residential non-structural interior-remodel permit category. (Mercer Island, Washington)

12. How does this bathroom work five or ten years from now?

Think about future users as well as today’s users.

Common Mercer Island Bathroom Planning Mistakes

Starting With Tile Instead of Layout

The finish should follow the room plan.

Moving Every Plumbing Fixture

Relocate fixtures only when function improves enough to justify it.

Making the Shower Huge but Storage Tiny

Luxury should not destroy daily function.

Installing a Tub Nobody Uses

Floor area is valuable.

Treating Tile as Waterproofing

TCNA specifically notes that grout joints are not waterproof; a proper wet-area method and substrate protect adjoining construction. (Tile Council of North America)

Choosing Tile Without Considering Wet-Floor Performance

Flooring needs to work when feet and surfaces are wet. NKBA’s current planning guidance explicitly addresses flooring surfaces and tile slip ratings. (NKBA)

Treating Ventilation as a Decorative Grille

Airflow, duct route, exhaust termination and controls matter.

Using Only One Ceiling Light

Task lighting around the vanity deserves its own plan.

Finalizing Electrical Before the Vanity and Mirror

Coordinate the entire elevation.

Forgetting Wall Blocking

Future grab bars, floating cabinetry and accessories may benefit from planned backing.

Selecting a Steam Shower Late

Steam changes the wet-area design.

Putting the Towel Warmer Where It Looks Best Instead of Where It Works Best

Design around use.

Creating Tiny Cleaning Gaps

If a surface cannot be reached, maintenance becomes harder.

Assuming Luxury Means More Materials

Restraint often produces a calmer, better-functioning room.

Beginning Construction Before Checking Permit Scope

Mercer Island currently treats bathroom remodeling as an identified residential interior-remodel project type. (Mercer Island, Washington)

Mercer Island Bathroom Planning FAQ

Bottom Line: Plan the Bathroom Behind the Tile First

A weak bathroom-planning sequence is: Pinterest → marble → faucet finish → tub → demolition A stronger sequence is: users → problems → layout → plumbing → structure → wet areas → waterproofing → ventilation → electrical/lighting → storage → materials → luxury → permits A bathroom can have:

• expensive stone;
• premium plumbing fixtures;
• custom glass;
• designer lighting;

and still be badly planned. The highest-value decisions are often invisible when the bathroom is complete:

• fixture placement;
• water management;
• ventilation;
• plumbing rough-in;
• electrical planning;
• wall backing;
• drain geometry;
• storage configuration.

A Well-Planned Mercer Island Bathroom Should Be:

easy to move through easy to dry easy to clean easy to store things in comfortable to use appropriate for future needs technically coordinated behind the finishes Then add the luxury. Not the other way around. If your planning has progressed from layout and material research into an actual construction scope, review CHC Remodeling’s bathroom remodeling services for the build side of the project.

About the CHC Remodel Team

Planning insight from residential construction, structural engineering, architecture, and interior design

CHC Remodel helps Seattle-area homeowners coordinate bathroom layouts, building systems, materials, and construction details before work begins.

Meet the CHC Remodel management team