Which cities is the Kolmo permit lookup verified for?

Ten cities: Seattle, Bellevue, Kirkland, Redmond, Sammamish, Issaquah, Renton, Kent, Federal Way, and Mercer Island. For these, every fee, threshold, and timeline is sourced from the city directly with the exact quote, URL, and the date Kolmo sourced it; an automated scanner monitors the source pages daily for drift. Outside these ten cities address lookup still works and we render the parcel and Washington-state baseline code, but per-city specifics are flagged as unverified.

Does the lookup cover unincorporated King, Pierce, or Snohomish County?

Address lookup works and parcels resolve to the county building department, but unincorporated coverage is currently baseline-only — Washington-state IRC, IBC, and WSEC plus state critical-area rules. Per-county fee and code deviations have not been verified to the same standard as the ten verified cities.

Will this replace calling the permit center?

For most homeowner projects — decks, kitchens, bathrooms, ADUs, fences, siding, windows, flooring, roofing, HVAC, electrical, plumbing — the published answer matches what the permit center will say, and the homeowner can submit with a pre-filled application packet. For variances, conditional uses, or unusual scope, calling the city planner is still recommended.

Where does the address go after submission?

The address is geocoded via Google Maps to identify the correct county, then queried against public county GIS endpoints. Parcel data is cached for 30 days. The address is not contacted, sold, or shared with third parties.

Who built this — and why?

Built by Kolmo Construction, a licensed Seattle-area general contractor. The team works with permit code daily and built this to fix the public web's poor coverage of homeowner permit questions. The lookup is free; if a homeowner wants a contractor for the project, Kolmo is one option.

HVAC permits in City of Mercer Island: fees, timeline & requirements (2026)

Everything you need to know about pulling a HVAC / mechanical permit in City of Mercer Island, Washington — when one is required, what it costs, how long review takes, what documents are required, and which inspections you can expect. Cited to Apply via MyBuildingPermit.com..

Permit required?

Yes — see threshold below

Permit fee

Mechanical permit + electrical permit (if new circuit) + plumbing permit (if condensate to drain).

Review timeline

—

When does a HVAC / mechanical need a permit in City of Mercer Island?

WAC 51-52 (2021 IMC) and WAC 51-56 (2021 UPC) require mechanical permit for any equipment install, replacement, or relocation. WSEC R403 requires sizing per Manual J/S/D for new equipment.

Required submittals

equipment specs (model #, capacity)
Manual J/S/D for new system
gas piping diagram if applicable
electrical permit cross-reference

Inspection sequence

rough-in / gas pressure test
final

Contractor specialties needed

general

Notes & caveats

From multi-jurisdiction tip sheet (Mercer Island column shows √ for): Furnaces, air conditioners, and heat pumps; Fireplaces, wood-burning stoves, and inserts; Gas piping; Water heater installation. Exempt: portable spas/saunas that plug in (no electrical work).

HVAC permit fee estimate in City of Mercer Island

Worked example for a $14,000 HVAC / mechanical project (mechanical permit). Your actual fee scales with project valuation.

Building permit fee	$175
Plan review	$113.75
WA state surcharge	$4.5
Estimated total	$293.25

Multi-appliance mechanical (HVAC system + ducts): ~$175 Computed from the City of Mercer Island fee bracket schedule · source ↗. Impact/utility fees may apply separately.

How to apply

1. Confirm your parcel's zoning & overlays. Run an address lookup for your City of Mercer Island HVAC / mechanical — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline/ECA/historic overlays.
2. Assemble submittals (4).
3. Submit through the city portal: Apply via MyBuildingPermit.com. ↗
4. Track review (typical: —). Respond to reviewer comments promptly.
5. Pay issuance fees (Mechanical permit + electrical permit (if new circuit) + plumbing permit (if condensate to drain).) and pick up the permit. Inspection card travels with the job.

Compare this against other cities

Side-by-side HVAC / mechanical requirements across all 10 verified Seattle-area cities.

All City of Mercer Island permits

Every project type — ADU, addition, kitchen, bath, deck, fence, and more — for City of Mercer Island.

HVAC permits in City of Mercer Island — FAQ

When does a HVAC / mechanical need a permit in City of Mercer Island?

WAC 51-52 (2021 IMC) and WAC 51-56 (2021 UPC) require mechanical permit for any equipment install, replacement, or relocation. WSEC R403 requires sizing per Manual J/S/D for new equipment.

How much does a HVAC / mechanical permit cost in City of Mercer Island?

For a $14,000 HVAC / mechanical project, the estimated City of Mercer Island permit fee is about $293.25 — building fee $175 + plan review $113.75 + surcharges. Fees scale with project valuation per the city schedule.

City of Mercer Island resourcesPermit portal ↗Fee schedule ↗