Issaquah, Washington Building Permit Guide

In Issaquah, Community Planning and Development (CPD) issues building, mechanical, plumbing and fire permits, while electrical permits are reviewed, issued and inspected by the state Department of Labor and Industries (L&I). Most applications are filed on MyBuildingPermit.com, and paper or over-the-counter applications are emailed to CPD. Plan review is 65% of the building permit fee, and the City’s target for a first review of a house is 4 weeks.

CPD and its Permit Center are at 130 E Sunset Way (mailing address P.O. Box 1307, Issaquah, WA 98027); call 425-837-3100 or email CPD@issaquahwa.gov, or book a virtual appointment with a building plans examiner, an engineer or a planner. Issaquah had 39,423 residents in the Census estimate for 2025.

Not every Issaquah address is in the city: Klahanie is part of the City of Sammamish and Mirrormont is unincorporated King County, so those permits go to Sammamish and King County.

What requires a building permit in Issaquah?

Issaquah adopts the state’s 2021 codes through its Construction Administrative Code in IMC 16.04.010, last amended in 2026, and that code’s section 105.2 is the City’s own exemption list. None of the exemptions applies in an area of flood hazard or a City critical area unless the work is entirely within or on the outside of an existing legal building, and exempt work must still meet the land use rules.

The City’s web pages use shorter, stricter wording than the adopted code: they give a 6-foot fence limit and measure a low deck within five or six feet of its edge, while IMC 16.04.010 says 7 feet and 36 inches. The single-family re-roof permit costs $111.45, plus a $5.57 technology surcharge and the $6.50 state building code fee.

What the city decides and what the state holds

The building codes themselves are the state’s. Issaquah sets its own administrative amendments, exemption list and fee tables, the flood hazard rules for the mapped floodplain (IMC 16.36), its Shoreline Master Program, zoning and fence limits, impact fees and construction hours. It leaves electrical permits entirely to L&I but still requires every contractor working in the city, electricians included, to hold an Issaquah business license.

Washington has a mandatory statewide building code under chapter 19.27 RCW that every city and county enforces and may make stricter; electrical permits come from the Department of Labor and Industries unless the city runs its own program or Tacoma Power serves the site. Building codes in Washington

Issaquah building department: who handles permitting

CPD’s Permit Center takes building, land use, site work, landscape, sign, tree and fire permit applications and runs inspections for City permits. Fire inspections are requested separately, by email to Inspections@esf-r.org. Pre-construction meetings are often required, especially for large projects.

Permit types

Residential permits

Single-family and duplex application packets cover ADUs, detached ADUs, decks and fences, full demolition, new construction and additions, re-roofs, remodels and solar panels. A deck application is one PDF with a site plan (setbacks, structure sizes and impervious surface calculations if the deck size changes) and deck plans at 1/4 inch to the foot with framing, stairs, handrails, guardrails and footings; MyBuildingPermit’s deck, stairs, guards and handrails tip sheets can stand in for custom details. For a new house on a vacant lot in the City’s water service area, the City’s fee guide adds a $617.03 land use review fee, mechanical and plumbing permits at 8% of the building permit fee each, refundable erosion control ($2,000) and street use ($1,200) deposits, and water, sewer and storm connection charges.

Building or remodeling a home here? Alliance handles residential permit applications, so the crew isn't waiting on the counter.

Commercial permits

Commercial and multifamily packets cover new construction and additions, tenant improvements, demolition, landscaping, solar, underground storage tank removal and wireless facilities. Tenant improvements pay the same valuation-based building fee and 65% plan review, with mechanical and plumbing permits priced on their own valuation and reviewed at 65% when plan review is needed. New commercial, multifamily and townhome projects must meet the City’s general requirements before a temporary certificate of occupancy is granted.

For tenant improvements and new commercial builds, Alliance handles commercial building permits through issuance. More on this: commercial building permits explained.

What comes before the building permit

Land use approvals such as site development permits, plats, shoreline exemptions or permits and SEPA review come first where they apply; a shoreline exemption has a 3-week first-review target and a substantial development permit 5 weeks. In the 100-year floodplain, a flood hazard permit needs an application, a covenant not to sue, an engineer’s certification and, for habitable buildings, an elevation certificate: new homes in Zone AE must have the lowest habitable floor and flood-prone utilities at least one foot above the base flood elevation, basements and other enclosed spaces below grade are not allowed, and fill may not reduce flood storage. Nothing may be built in the floodway apart from bridges, utilities and similar exceptions. Work on an existing building depends on its age: a building from before May 1980 must be brought to flood standards once improvements exceed 50% of its value, while for later buildings every improvement must meet them. A few areas are mapped Zone AO (shallow flooding of one or two feet), where the standards differ and fill is allowed. Projects larger than a single-family lot may need a hydraulic flood study to prove there is no loss of floodplain conveyance.

Issaquah permit costs and fees

The building permit fee is set by Table A in IMC 16.04.010, as amended by Ordinance 3138 (adopted March 30, 2026, effective April 7) and Ordinance 3145 (adopted July 20, effective July 28, 2026); the City’s posted fee chart, dated November 20, 2025, still shows the older, lower figures. The fee guides for new houses and remodels are dated January 1, 2026; most fees are set when the permit is issued, and a plan review deposit equal to the plan review fee is paid at application and credited later. New construction is valued from the ICC building valuation table. The state fee appears in the City’s guides as a “State Surcharge” of $6.50 for a new house (plus $2.00 for each additional dwelling unit) and $25 (plus $2.00 per added unit) on the tenant improvement guide.

Worked example. A remodel valued at $60,000 is in the $50,001 to $100,000 band: $919.23 plus 10 × $9.69 ($96.90) is a building permit fee of $1,016.13, and plan review at 65% adds $660.48, for $1,676.61 before the 6% technology surcharge, the state surcharge and any mechanical, plumbing or L&I electrical permit.

Impact fees, effective January 1, 2026, are due when the building permit is issued. For a home they are charged per square foot of floor area within a minimum and maximum: traffic $4.43 (from $3,750.97 to $15,505), parks $4.66 (from $3,945.72 to $16,310) and fire $1.65 (from $1,397.09 to $5,775). The Issaquah School District’s school impact fee is not imposed on single-family homes. Development agreement areas such as the Issaquah Highlands may have different rates.

Trade permits and who may pull them

Mechanical and plumbing permits are the City’s: for a new house each is 8% of the building permit fee, and for remodels they are priced by fixture or valuation; a water heater replacement can go on either permit. Electrical permits are not issued by Issaquah at all; L&I reviews, issues and inspects them, many online, and its nearest office is in Bellevue.

How to apply for an Issaquah building permit

Review, corrections and what causes delay

The City’s target review times (April 2026) for a single-family house, duplex or townhouse of up to four units are 4 weeks for the first round, 3 for the second and 1 for each after that; tenant improvements are 3, 2 and 1 weeks; commercial and larger multifamily projects 6, 4 and 2 weeks; and deferred submittals and revisions 2 weeks. A new house’s plan review fee covers two rounds before hourly fees begin.

Inspections in Issaquah

All inspections except fire are booked at inspection.mybuildingpermit.com: choose Issaquah, enter the permit number and pick a type and one of the next five available days, with an optional morning or afternoon preference. Requests are due by 6 a.m. on the day of the inspection; backflow and water quality inspections need a request by 3 p.m. the business day before and happen only on Tuesdays and Thursdays; fire inspections need 48 hours and are requested by email. Cancellations can be made online until 6 a.m., and by phone after that.

The permit and approved plans must be on site. Every other inspection on a permit must be approved before the final; a project that needs a certificate of occupancy asks for it in person at the Permit Center with the completed permit card, and in a flood zone the surveyor’s elevation certificate must be accepted first. Construction hours are 7 a.m. to 6 p.m. on weekdays; work outside them needs an expanded work hours permit.

Issaquah permit search and official resources

MyBuildingPermit’s status search covers current and past Issaquah permits, with descriptions, plan reviews, inspections, correction notices and fees, and the daily inspection list shows estimated arrival times. Issaquah participates in the National Flood Insurance Program; FEMA’s status book lists August 19, 2020 as its current map date.

• Issaquah Permit Center
• Permit process overview
• Do I need a permit?
• Decks and fences
• Construction permit fees
• Building permit fee chart (PDF)
• New single-family fee schedule (PDF)
• Tenant improvement and remodel fee schedule (PDF)
• Impact and mitigation fee schedule (PDF)
• Target review times (PDF)
• Schedule an inspection
• Flood hazard permits
• Electrical permits (L&I)
• Building codes adopted in Issaquah
• IMC 16.04.010: Construction Administrative Code, exemptions and fee tables
• Single-family re-roof permits

Issaquah building permit FAQ

Who issues building permits in Issaquah?

The City’s Community Planning and Development department, 130 E Sunset Way, for land inside the city limits. Electrical permits come from L&I.

I live in Klahanie or Mirrormont. Does Issaquah issue my permit?

No. Klahanie is in the City of Sammamish and Mirrormont is unincorporated King County.

Do I need a permit for a fence?

The adopted code exempts fences up to 7 feet that meet land use and street standards, outside flood and critical areas; the City’s web page still says 6 feet, and front-setback fences in the SF-D zone are limited to 4 feet.

Do I need a permit to re-roof?

Not for an in-kind re-roof that leaves the sheathing alone or an overlay up to two layers. Sheathing work, skylights, a pitch change, moved rooftop units or roofing over 10 psf need a permit, which costs $111.45 plus surcharges.

How much does a building permit cost?

A $60,000 remodel pays a $1,016.13 building permit fee and $660.48 plan review, plus the 6% technology surcharge, the state surcharge and trade permits.

When do I have to book an inspection?

By 6 a.m. on the day, on MyBuildingPermit; fire inspections need 48 hours’ notice by email.

Can I build in the floodplain?

Outside the floodway, yes, with a flood hazard permit: new homes in Zone AE must have the lowest habitable floor at least one foot above the base flood elevation.

Simplify Issaquah permitting with Alliance Permitting

Alliance Permitting is a permit documentation and submission company in Washington. We prepare your paperwork, file it correctly and coordinate with the permitting authority through issuance. We are not a contractor and we do not perform licensed plan review or inspections; that work stays with your licensed team and the jurisdiction.

This guide is provided by Alliance Permitting for general information about Issaquah permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.