Seattle Remodel Permit Checklist: Building, Electrical, Plumbing and Mechanical Permits by Project Type

 

 

Permitting a remodel in Seattle is easier to understand when the project is separated into scopes.

A homeowner may say, “We are remodeling the kitchen,” but the City does not treat “kitchen remodel” as one universal permit type. The project may involve a construction permit for structural or building work, an electrical permit for new or altered wiring, a plumbing permit for moved fixtures, a mechanical permit for ventilation or HVAC work, and sometimes additional approvals for side-sewer or other site work.

That is why permit planning should happen while the design is being developed.

Waiting until construction is ready to start can reveal that drawings, engineering, or trade permits are still missing.

Seattle Department of Construction and Inspections states that most projects require permits, while certain minor repairs and alterations may be exempt. Whether an exemption applies depends on the actual work, not simply the room being remodeled.

This checklist provides a practical way to identify the likely permit path. It is not a substitute for SDCI or Public Health review of a specific property.

 

Start With the Construction Permit

A construction permit covers the building portion of many additions and alterations.

Common examples that can trigger building-permit review include:

– removing or changing load-bearing walls;

– adding square footage;

– changing structural beams, posts, floors, or roof framing;

– creating or altering significant wall openings;

– changing stairs;

– converting portions of a building to a different use;

– and other building alterations that fall outside permit-exempt work.

Seattle has more than one review path. Some smaller qualifying projects may be eligible for a Subject-to-Field-Inspection permit, which uses a simplified process for certain types of work. Larger or more complex projects require fuller plan review.

Do not assume that “small remodel” automatically means SFI.

The scope and eligibility criteria determine the review path.

If a wall may be structural, review When Does a Home Remodel Need a Structural Engineer? before the floor plan is finalized.

Kitchen Remodel Permit Checklist

A kitchen project can range from finish replacement to structural reconstruction.

A limited project may involve replacing cabinets, countertops, flooring, and appliances in essentially the same layout.

A larger project may include:

– removing walls;

– enlarging exterior openings;

– relocating the sink;

– adding a pot filler;

– changing gas piping;

– installing a larger range hood;

– adding circuits;

– moving lighting;

– upgrading the electrical panel;

– or adding new windows and doors.

The larger project can involve several separate permits.

A structural opening should be evaluated before demolition. See Removing a Load-Bearing Wall: Cost, Engineering, Permits and Process for the construction sequence.

Bathroom Remodel Permit Checklist

Bathroom remodeling frequently touches plumbing, electrical, ventilation, and waterproofed assemblies.

Moving or changing plumbing fixtures can require plumbing permitting.

New wiring, circuits, heated floors, lighting, receptacles, or other electrical changes can require an electrical permit.

Exhaust-fan or duct changes may involve mechanical permitting.

Structural changes can add a construction permit.

United Signature already has a detailed guide to Permit Requirements for Major Bathroom Renovations that should be used together with this broader Seattle checklist.

Electrical Permits

Seattle states that an electrical permit is required when electrical wiring is installed, altered, extended, or connected to electrical equipment.

That makes electrical permitting relevant to many remodels, even when no walls are being structurally changed.

Examples can include:

– new lighting circuits;

– relocated receptacles;

– new appliance circuits;

– panel changes;

– service upgrades;

– EV charging;

– electric heating equipment;

– and substantial rewiring.

Electrical work has its own inspection sequence. SDCI notes that most electrical permits require cover, service, and final inspections as applicable to the work.

The important construction lesson is that rough electrical inspection happens before concealed wiring is covered.

Plumbing and Gas Permits

Within Seattle, plumbing and gas piping permits are administered by Public Health – Seattle & King County.

Public Health states that a permit is required when installing, relocating, or changing a plumbing or gas piping system.

Typical remodeling examples include:

– moving a sink;

– adding a bathroom;

– relocating a shower or bathtub;

– changing drain or vent routing;

– adding plumbing for a wet bar;

– repiping;

– or modifying gas piping.

A homeowner should not assume that a building permit automatically includes plumbing or gas authorization.

The trade permit is a separate part of the project.

Mechanical Permits

Mechanical permits cover equipment and systems such as heating, ventilation, and air conditioning.

Remodeling examples can include:

– installing or replacing certain HVAC equipment;

– relocating ductwork;

– adding mechanical ventilation;

– changing exhaust systems;

– and other regulated mechanical work.

Kitchen range hoods deserve special attention because a high-capacity hood can affect duct design and make-up-air requirements depending on the system and applicable code.

Bathroom exhaust work also needs proper exterior termination and ducting.

A mechanical permit should be identified during design so duct routes do not conflict with framing, cabinetry, or structural beams.

Side-Sewer Permits

Some projects also affect the building’s drainage or side-sewer system.

Seattle Public Utilities issues side-sewer permits for work involving sanitary side sewers and drainage systems within its jurisdiction.

This is particularly relevant to:

– additions;

– DADUs;

– major site drainage changes;

– sewer repairs;

– and projects connecting new plumbing to exterior sewer infrastructure.

A standard interior remodel may not need side-sewer work.

A new addition containing a bathroom may.

Home Addition Permit Checklist

A Seattle home addition should be treated as a multi-discipline project.

Likely scope can include:

– construction permit;

– structural engineering;

– electrical permit;

– plumbing permit if fixtures are added or moved;

– mechanical permit;

– side-sewer or drainage work when applicable;

– and required inspections.

The budgeting implications are discussed in How Much Does a Home Addition Cost in Seattle?.

Addition design should not be completed without checking the permitting and site constraints that control the project.

 

Basement Remodel Permit Checklist

Basement projects are highly dependent on intended use.

A recreation room differs from a new bedroom.

A bedroom differs from an ADU.

A bathroom adds plumbing and ventilation.

Structural changes to foundation openings or posts add another layer.

Before assuming an unfinished basement can simply be “finished,” review How to Finish a Basement in Seattle: Moisture, Insulation, Egress and Permits.

Permits are only one part of basement feasibility. Ceiling conditions, egress, moisture, utilities, and legal use all matter.

Whole-House Remodel Permit Checklist

A whole-house project can involve nearly every permit category.

Typical planning should identify:

– building alterations;

– structural calculations;

– electrical service and wiring;

– plumbing;

– HVAC and ventilation;

– additions;

– window or door changes;

– site drainage;

– sewer work;

– and inspections.

The advantage of planning these together is coordination.

One approved structural beam may affect duct routing. A relocated kitchen may affect sewer and electrical scope. A new bathroom may affect ventilation and framing.

The permits are separate, but the design should not be.

What Work Usually Does Not Need a Construction Permit?

Seattle lists certain permit exemptions for minor work, but exemptions have limits and exceptions.

Examples of work that may not require a construction permit can include certain painting, finish replacement, minor repair, and similar nonstructural work.

However, electrical, plumbing, gas, or mechanical changes can still require their own trade permits even when the building work itself is exempt.

Environmentally critical areas and unusual site conditions can also change what applies.

The safest rule is simple:

Never decide permit status from the project title alone.

Check the actual scope.

When Should Permits Be Applied For?

After enough design exists to describe the work accurately, but before construction that requires approval begins.

Structural plans should coordinate with the architectural layout.

Plumbing fixtures should be located.

Major mechanical routes should be understood.

Electrical loads and equipment should be known.

Starting permit applications with an unstable design can lead to revisions later.

Starting construction before required permits are issued can lead to enforcement.

Inspections Are Part of the Permit

Obtaining a permit is not the end of the process.

Seattle requires inspections at appropriate construction stages.

For building work, inspections can include foundation, framing, insulation, and final stages depending on scope.

Electrical, mechanical, plumbing, and gas work have their own inspections.

SDCI’s residential inspection guidance notes that the building final occurs after construction is complete and related permits have received their required final approvals.

This is why drywall should not cover work that still needs a rough inspection.

A good contractor builds the inspection sequence into the construction schedule.

How to Organize Permits for a Remodel

Create a permit matrix before construction.

Use columns for:

– scope;

– responsible designer;

– permit authority;

– application status;

– approval status;

– required inspections;

– corrections;

– and final approval.

For example:

Structural wall removal — SDCI construction permit.

New circuits — SDCI electrical permit.

Moved shower and toilet — Public Health plumbing permit.

New exhaust duct — mechanical permit.

Exterior sewer alteration — SPU side-sewer permit where applicable.

This prevents the common mistake of treating one permit number as proof that every trade is authorized.

FAQ

Do I need a permit for a kitchen remodel in Seattle?

It depends on scope. Structural, electrical, plumbing, gas, and mechanical work can require permits even when some finish replacement does not.

Who issues plumbing permits in Seattle?

Plumbing and gas piping permits in Seattle are administered by Public Health – Seattle & King County.

Do I need a permit to remove a load-bearing wall?

Yes. Structural work involving load-bearing supports requires construction permitting and may require engineering.

Does a building permit include electrical work?

No. Electrical work uses its own permit process.

Can a small remodel use a Subject-to-Field-Inspection permit?

Some qualifying smaller projects can. Eligibility depends on the specific scope and SDCI criteria.

Do I need final inspections?

Yes, permits need the required inspections and final approval to be properly completed.