Whole house remodel contractor quote in Seattle: define the scope before you compare

Three quotes for a whole house remodel can only be compared if all three price the same defined scope on the same existing house. Until there are drawings, each contractor is pricing a guess about your project, so the numbers differ for reasons that have little to do with the contractors. In Seattle the city adds a second variable: in its section on quick permits, SDCI’s Tip 316 says that reconfiguring spaces or replacing wall surfaces in more than 60 percent of the existing house is likely a substantial alteration, and the residential code then asks for certain upgrades throughout the house. My first basic feasibility check is free and usually takes about a day. I design and administer construction and do not build.

Who this page is for

This page is for an owner collecting contractor quotes for a whole home remodel in Seattle, or holding quotes that do not agree. I design the remodel and administer construction. I do not build, and this page names no builder and recommends none. Eastside cities each set their own tests, and my page on whole house remodels in Seattle and on the Eastside compares them; the worked example here is Seattle only. The sources for this page were read on 9 November 2026: SDCI Tip 316 (updated October 29, 2026), chapter 1 of the 2021 Seattle Residential Code, SDCI’s permit page, Washington Department of Labor and Industries (L&I) pages and publication F625-084-000 (08-2026), and the RCW. Seattle’s land use code on Municode was not read. Confirm each point with SDCI; this is general information, not legal advice.

Why three whole house remodel quotes do not compare

L&I’s Hire Smart page tells homeowners to interview several registered contractors, get bids in writing and evaluate scope of work, warranties, references, completion dates and price, and warns that focusing only on price “may get you a less than desirable result.” Its publication F625-084-000 (08-2026) says to get three written bids. The same page puts the starting point on the owner: if you know what you want done and can clearly explain it, you are less likely to run into problems. For a whole house remodel, a clear explanation is a drawing. Without one, each contractor fills the gaps differently, and the gaps can be large.

Where two quotes can differ	What it looks like	What to ask
Scope	One quote includes the primary suite and the other leaves it out, or one moves a wall and the other keeps it.	Which rooms, walls and systems does the number cover?
Existing conditions	One assumes the framing and wiring behind the walls are sound and the other allows for surprises.	What does the number assume about the house as it is?
Code upgrades	One carries the upgrades the city requires in the untouched parts of the house and the other does not.	Does it assume the city treats the work as a substantial alteration?
Allowances	Fixtures, cabinets and finishes are carried as a lump sum in one quote and itemized in another.	Can I see every allowance as a list?
Permits and fees	One includes permit fees and the other leaves them to you.	Are city permit fees in or out? L&I says to verify that permit fees, taxes and other costs are included.

Add those up and three quotes describe three projects. My page on choosing a general contractor covers the hiring side.

What a quote can be built on

A quote can only be as specific as what it prices. L&I lists the specific work to be performed among the points a contract should cover, alongside price, payment terms, permit fees where they apply, materials, suppliers and subcontractors, warranties and change orders. The specific work is hard to write without drawings that show it.

The city asks for the same thing from the other side. For its quick permit route, SDCI’s Tip 316 says a floor plan must show “the already existing structure and proposed work” with the exact square footage of work, and lists the existing structural information it wants: direction and size of framing, span, spacing, and the location and size of openings. It also says to label the plans to show which rooms will have new drywall or plaster. Those are scope statements, and they are the same facts a contractor needs. My page on existing conditions and as-built drawings covers how the existing house gets documented.

Structure is the next item. For the same quick route, Tip 316 says that if you remove a shear wall or add a window or door in an exterior wall, you must show that the structure can still resist wind and earthquake loads, and SDCI may ask for plans stamped by a civil or structural engineer. A quote that assumed an open plan without that question answered has priced something that may change. See when a remodel needs a structural engineer.

Then there are the materials inside the walls. The Puget Sound Clean Air Agency’s homeowner renovation page says to check for asbestos before you start any renovation, and that an AHERA-certified building inspector must do the survey except where you live in and own the single family house. EPA’s lead renovation rule requires anyone paid to perform work that disturbs painted surfaces in homes built before 1978 to be certified, with their employees trained in lead-safe work practices. Each is a reason a quote for an older house carries assumptions. Confirm with the agency that its rules cover your address.

Gut renovation in Seattle: what the city counts as a major remodel

Neither Tip 316 nor chapter 1 of the 2021 Seattle Residential Code uses the words gut renovation. The code’s term is substantial alteration. Section R107.5.1.1 says substantial alterations or repairs may mean, “as determined by the building official,” remodeling or additions that substantially extend the useful physical and/or economic life of the building or a significant portion of it. A house so classed has to meet the code’s rules for emergency escape openings (R310), means of egress (R311), smoke and heat alarms (R314), carbon monoxide alarms (R315) and dwelling unit separation (R302.2 through R302.4), plus the seismic provisions of R107.5.1.2. For that last item the building official may approve strengthening foundations and cripple walls instead.

The code gives no number. Tip 316 does: “If you are reconfiguring spaces or replacing wall surfaces in more than 60 percent of the existing house, your project is likely a substantial alteration.” The Tip adds that these projects require upgrades throughout the structure, including in areas where you are not making changes. The 60 percent sentence sits in the Tip’s list of what can qualify for a quick subject-to-field-inspection permit, and the Tip does not say how SDCI measures the percentage, so the arithmetic below is my illustration, and SDCI should be asked how it will count your house. SDCI’s residential code page says Seattle has adopted the 2021 International Residential Code with local amendments, and its code adoption page says the adoption and implementation of the 2024 Seattle Codes is anticipated no sooner than May of 2027.

Take a hypothetical house, not a real address: a 2,000 square foot single family house with a kitchen of 200 square feet, living and dining of 500, a family room of 300, entry and halls of 200, a primary suite of 350, two bedrooms of 150 each, a hall bath of 70 and a laundry of 80. That sums to 200 + 500 + 300 + 200 + 350 + 150 + 150 + 70 + 80 = 2,000. The 60 percent line is 0.60 x 2,000 = 1,200 square feet. Three contractors are each told “open it up and redo the main living areas” and each reads it differently.

Quote	Area it assumes	Arithmetic	Share of the house
Quote 1: kitchen, living and dining, family room	Reconfigured or resurfaced	200 + 500 + 300 = 1,000, then 1,000 / 2,000	50.0 percent, under the line by 1,200 to 1,000 = 200 square feet
Quote 2: Quote 1 plus entry and halls	Reconfigured or resurfaced	1,000 + 200 = 1,200, then 1,200 / 2,000	60.0 percent, which is not more than 60
Quote 3: Quote 1 plus the primary suite	Reconfigured or resurfaced	1,000 + 350 = 1,350, then 1,350 / 2,000	67.5 percent, over the line by 1,350 to 1,200 = 150 square feet

Quote 2 sits exactly on the line, and the Tip says “more than.” Add a 10 square foot closet to that scope and it is 1,210 / 2,000 = 60.5 percent. Quote 3 is likely a substantial alteration on the Tip’s wording, and Quote 1 sits under the Tip’s line, though the building official decides in either case. The gap between them is 1,350 to 1,000 = 350 square feet, the primary suite, but the code consequence can be larger than that room: the upgrades in R107.5.1 apply to the whole building. A number built on the 50 percent scope may leave out work that the city asks for on a 67.5 percent scope. Side by side the numbers look like two prices for one remodel. They are two remodels.

The permit route follows scope too. SDCI’s permit page says a large or complicated project needs a regular building permit, and Tip 316 excludes second story additions and lowering a basement floor from the quick route. Where a whole house remodel also adds a floor, see second story addition and whole house remodel. For how Seattle’s PACT initiative relates to remodel permits, see my PACT page.

Whole house remodel cost: why this page gives no figure

I give no whole house remodel cost figure on this page. A figure needs a size, a scope and a set of drawings behind it, and the worked example above shows why. My whole house remodel cost guide is the place for budget, and planning a million dollar remodel goes further into a large one. If you are weighing a remodel against replacing the house, see gut renovation versus rebuild and remodel or tear down.

What to ask each contractor who quotes

Whether or not you hire an architect, these questions turn a number into something you can compare.

• Is the contractor registered? Check the registration on L&I’s Verify tool before you sign. Under RCW 18.27.114, for residential work of four or fewer units priced at $1,000 or more a contractor must give you a disclosure statement before starting work.
• What is the number based on? Drawings, a walk through or a square footage, and which rooms and walls it covers.
• What does it assume about the house as it is? Framing, wiring, plumbing and anything behind the walls, including the asbestos and lead points above.
• Does it assume a substantial alteration? Ask whether the number includes the whole house upgrades if the city classes the work that way.
• What is in the allowances, and what is left out? Ask for fixtures, cabinets and finishes as a list, and for the exclusions in writing.
• What are the dates, products and warranties? L&I says to compare start and end dates, the products to be used and the warranties offered.

The order that works

Step	What happens	How long
1. Feasibility check	You send me the address and what you want to change.	The first basic check is free and usually takes about a day. An in depth analysis is $1,500 and takes 2 to 3 weeks.
2. Design to permit submission	The remodel is designed and drawn as a permit set.	Typically 2 to 4 months.
3. Permit review	The city reviews and sends corrections.	SDCI says it tries to finish its initial review of complex permits in eight weeks, and of simple ones in two to three.
4. Price	Builders you choose price the same drawings by bid or by negotiation.	Ask each builder for a written schedule.
5. Construction	The builder builds and I administer construction.	Set by the builder’s schedule.

The sequence is the point: the drawings fix the scope on paper, and builders then price one set of documents. If you are buying a house to remodel, read whole house remodel feasibility before you buy. For phases and timing, see how long a whole house remodel takes in Seattle.

How it works with me

First comes the free basic feasibility check, usually about a day. If you want more, an in depth analysis is $1,500, takes 2 to 3 weeks and goes further. If you go ahead, the fee for design and permit is fixed and agreed before design starts, and design to permit submission typically takes 2 to 4 months. After the permit, I administer construction. I do not build, I name no builders and I give no construction prices.

Hiring me is your choice. RCW 18.08.410(5) says the state’s architect licensing chapter does not prevent any person from doing design work, including preparing construction contract documents and administering the construction contract, for a residential building of up to and including four dwelling units. That statute does not settle what the city or an engineer may ask for on a given project. I have been an architect since 1996, and I am a member of the AIA (since 1992) and NCARB (since 1996).

Questions

How do I compare whole house remodel contractor quotes in Seattle?

Start by making sure every quote prices the same scope on the same drawings. L&I advises getting three written bids and comparing scope of work, warranties, references, completion dates and price. If the quotes were given without drawings, each contractor filled the gaps differently and the numbers do not compare. Put the scope on paper first.

Why are my whole home remodel quotes so different?

Most often because they describe different projects: different rooms, different assumptions about what is behind the walls, different allowances, and different views on whether the city will treat the work as a substantial alteration, which in Seattle brings upgrades throughout the house.

What does a contractor need to give a real whole house remodel quote?

A defined scope shown on drawings. L&I lists the specific work to be performed among the points a contract should include. SDCI’s Tip 316 asks for a floor plan showing the existing structure and the proposed work, existing framing information, and labels on the rooms that get new drywall or plaster. Those same facts let a contractor price the job.

Is a gut renovation in Seattle a substantial alteration?

The building official decides (SRC R107.5.1.1). The code uses the term substantial alteration, not gut renovation. SDCI’s Tip 316 says reconfiguring spaces or replacing wall surfaces in more than 60 percent of the existing house is likely a substantial alteration, and the Tip does not say how it measures that; the sentence sits in its section on quick permits. On a hypothetical 2,000 square foot house the line is 0.60 x 2,000 = 1,200 square feet. Ask SDCI how it will count your house.

How much does a whole house remodel cost?

I give no figure on this page, because a number belongs to a defined scope and a set of drawings. The same house can be priced as two different projects depending on what is touched. My whole house remodel cost guide and my page on a million dollar remodel are the places to plan a budget, and a builder’s price on complete drawings is the number to rely on.

Should I hire an architect before I collect contractor quotes?

It is your choice. RCW 18.08.410(5) says the state’s architect licensing chapter does not prevent any person from doing design work for a residential building of up to four dwelling units, though that does not settle what the city or an engineer may ask for. The case for going first is that the drawings give every contractor the same scope to price, and a quote can then be compared. I design the remodel and administer construction, and I do not build.

How do I check that a Seattle contractor is registered?

Use L&I’s Verify a Contractor, Tradesperson or Business tool. L&I says it shows whether a business has an active contractor registration and an active, paid-to-date workers’ compensation account for any employees, and that you can check for safety violations and lawsuits against the contractor’s surety bond. For residential work of $1,000 or more, RCW 18.27.114 requires the contractor to give you a disclosure statement before starting work.

What does the free feasibility check cost, and what comes after it?

The first basic feasibility check is free and usually takes about a day. An in depth analysis is $1,500, takes 2 to 3 weeks and goes further. If you go ahead, the fee for design and permit is fixed and agreed before design starts, and design to permit submission typically takes 2 to 4 months.