Short answer: I design whole house remodels in Issaquah for a fixed fee, about $10,000 to $200,000 depending on the project budget and location, and the first feasibility check is free and takes about a day. Before you pay for drawings, your architect should say which Issaquah rules will decide the job: whether the house is legally nonconforming and where your scope sits against the city’s 75 percent line, whether the lot has a steep slope, big trees or the lake shoreline, and, in the Highlands, an architectural committee that signs off before the city sees the plans.

This page is for an Issaquah owner with a remodel budget of $750,000 or more who is comparing architects, including in Issaquah Highlands, Talus and on the Lake Sammamish shoreline. Piper Cole designs and administers construction on your behalf. It does not build, so the builder you hire answers to you and to the drawings. The rules come from Title 18 of the Issaquah Municipal Code (IMC) as adopted in the city’s ordinances, and from the city’s own permit pages and PDFs, read on 15 October 2026. The city’s online code site was not readable to me, so I cite the adopted ordinances, not the live code. Confirm with the city. My Issaquah zoning and permit guide has the rest of the zoning rules, and my Issaquah page says where I work.

What Issaquah’s code does to a remodel

Many Issaquah houses were built under older rules and now sit inside a setback. That is legal, and the code calls it nonconforming. Issaquah sets no wall count and no flat dollar line. It sets a review track by cost against the county’s value of your building, and approval tests that apply on either track.

Sources: Ordinance 3013 (IMC 18.204 and 18.214, effective June 1, 2023), from the city’s document center. Chapter 18.214 is cited as adopted. The city’s online code was not readable to me, so I could not check its current text. I searched for a later ordinance amending 18.214 and found none, but I cannot rule one out. In the Highlands and Talus, IMC 18.214.140 exempts certain nonconformities, including density and floor area, created by the 2023 Form and Intensity chapter for plats approved before it, so ask whether it covers your house.

At a $750,000 scope, the 75 percent line is reached when the assessed improvement value is $1,000,000 or less ($750,000 divided by 0.75). The improvement value is the building part of the county’s assessment, not the land. The code says “remodel or alteration costs,” and I do not assume your whole budget counts. That is an illustration, not a ruling. My threshold comparison sets Issaquah beside other Eastside cities.

SF-E, SF-S and SF-SL: the numbers a remodel meets

The table lists no floor area ratio for these zones. The envelope is the yards, the height and a cap on hard surface (IMC Table 18.404.090(A), restated in 2025 by Ordinance 3088).

Impervious surface counts the footprint plus driveway, patios, decks, porches and pools, so an addition and a new terrace draw from one budget. On a 9,600 square foot SF-S lot the cap is 3,840 square feet (9,600 x 0.40). Height is measured from average grade, taken from spot elevations every 10 feet around the footprint (IMC 18.404.040 and 18.404.050). Highlands and Talus have their own tables.

Slopes, trees, the lake and the Highlands

Slopes and soils. Slopes of 40 percent or more carry a 50 foot buffer from the top and toe. A critical areas study can cut it to 10 feet, but an occupied building must stay 25 feet from the top or toe, plus a 15 foot building setback from the buffer edge (IMC 18.802.130 and 18.802.450). Ground disturbance on slopes of 15 percent or more with 10 feet of rise falls under the forested hillside chapter, which generally caps cuts, fills and retaining walls at 10 feet (18.810.090 and .100). The city’s Soils Report Requirements handout (September 2023) requires a soils report for structures needing a building permit, with exceptions such as single story room additions the Building Official approves in advance. Ask whether your scope needs one.

Trees. The tree code changed effective October 14, 2025 (Ordinance 3114). A significant tree is 6 inches or more at breast height (8 for alder and cottonwood). Redevelopment that expands the footprint or impervious area must keep 35 percent of the total diameter of significant trees in the developable area, and construction stays 5 feet outside a protected tree’s drip line. See my guide to building around big trees.

Lake Sammamish. Shoreline jurisdiction reaches 200 feet landward of the ordinary high water mark. The program sets a 35 foot buffer and a 15 foot building setback. An existing legal house may be expanded without a variance if the work stays landward of both, and new impervious area above 500 square feet in five years requires equal buffer planting. The council adopted Ecology’s edits as Ordinance 3089 on April 21, 2025, and Ecology’s final approval letter is dated May 12, 2025, with an effective date 14 days later. The program also says nonconforming development in shoreline jurisdiction is subject to it in addition to IMC 18.214. See my shoreline exemption guide.

Design review. I found no city design review step for a detached house in SF-E, SF-S or SF-SL. The Highlands differ. IMC 18.706.030 says that before any permit submittal the owner must show Architectural Review Committee (ARC) approval where the ARC has purview, and the city’s packet asks for the ARC stamp on the site plan and elevations. IMC 18.708 applies Talus standards to all Talus properties, and I could not tell how they apply to a remodel. The association’s guidelines were blocked to my reader, so ask it how long its review takes and plan that round first.

How long Issaquah review takes, in the city’s own numbers

The city publishes target review times in weeks, last updated April 2026. The clock starts when permit fees are paid, and fees are invoiced after the submittal is deemed sufficient.

Source: City of Issaquah, Target Review Timelines, last updated April 2026. The handout does not split remodels from new houses, and the city links it from its new construction and addition page. Three rounds on the building row come to 8 weeks (4 + 3 + 1), before the days you spend answering. I found no report of how long completed residential permits actually took, so I plan on the targets plus a revision round or two. The whole calendar is in how long a whole house remodel takes.

Applications go through MyBuildingPermit.com. The city’s remodel permit covers interior remodels, and an addition goes through its new construction and addition permit. For that permit a pre-submittal meeting may be required, and the city’s packet (August 2023) lists a geotechnical report and review letter, a stormwater report, stamped structural calculations and an energy code worksheet. Its packets say that if an architect or engineer prepares the plans, every sheet and calculation must be stamped.

What the city charges. Fees are set by the city and sit outside my fee. For an interior remodel, the city points to its Tenant Improvement Fee Schedule (updated January 1, 2026), which lists a building permit fee read from a valuation chart (updated November 20, 2025) and a plan check fee of 65 percent of it. Here is that part at a $750,000 valuation.

Mechanical and plumbing permit fees, fire fees, a technology surcharge, a state surcharge and any outside or hourly review fees come on top, and electrical permits come from the state. The Tenant Improvement schedule lists impact fees only for a change of occupancy. The surcharge figures conflict. The city’s remodel page lists 5 percent and $6.50, the Tenant Improvement schedule lists 6 percent and $25, and the new single family schedule lists 6 percent and $6.50. I do not know which applies to your project, so I give no total, and the city should say. The chart’s lines also do not chain exactly: the $100,001 to $500,000 line reaches $4,617.06 at $500,000, while the next starts at $4,496.87. The city’s pages do not say how a remodel’s valuation is set, so ask for an estimate on your scope in writing. My Seattle, Bellevue and Kirkland fee guides show how I work a schedule, though each city’s table is its own.

What changes the cost and the schedule

Planning ranges from Piper Cole, before design fees, permits, sales tax and contingency. They are not quotes. At those ranges, $750,000 of construction renovates roughly 1,364 to 2,500 sq ft ($750,000 divided by $550, and by $300). The million dollar remodel guide shows where the money goes. On an Issaquah house, a nonconforming wall, a hillside, trees, the shoreline buffer and the Highlands committee round can each add scope or time. Opening walls may also bring a structural engineer; see when a remodel needs one.

What to ask any architect before you sign

1. Is my house nonconforming, and how will you show it was legal when built? The answer should name IMC 18.214 and the records you will pull.
2. Where does my scope sit against the 75 percent line? A good answer uses the assessed improvement value for my parcel and says which costs the city counts.
3. Do I need a soils report, a critical areas study or a tree permit? Ask what each adds in time and consultants.
4. Am I in the Highlands, Talus or the shoreline area? That decides who reviews first.
5. Is the fee fixed, and is it set before drawings start? Ask whether it is fixed or a percentage of construction cost, and what happens if the budget moves.
6. What sits outside the fee? A surveyor, structural, geotechnical and civil engineers, an arborist and the city’s permit fees are the usual items.
7. How many correction rounds did your last Issaquah jobs take?
8. Do you administer construction, and do you build? I administer for you and do not build, so the person judging the work is not doing it.

How the work runs, in order

I have worked as an architect since 1996, I am an AIA member since 1992 and an NCARB member since 1996, and I take on 20 to 30 projects a year. I have won three Masonry Excellence Awards, for commercial projects. The Carr residence was featured in Above The Lake and Lux magazines. My office is in Kirkland, and the remodels I take on start at $750,000.

Questions