Addition permits in Redmond: fees, timeline & requirements (2026)
Everything you need to know about pulling a home addition permit in Redmond, Washington — when one is required, what it costs, how long review takes, what documents are required, and which inspections you can expect. Cited to Redmond Planning and Community Development.
Free lookup, no account needed — your lot polygon, zoning, setbacks and overlays, cited to Redmond's source.
When does a home addition need a permit in Redmond?
Additions, alterations, and remodels require a building permit with a site plan. Garage conversion to living space also requires a permit. All trade (electrical/plumbing/mechanical) and fire sub-permits must be completed and passed before the Building Final.
How long a home addition permit actually takes in Redmond
33 permits issued in the last 12 months: half were issued within 97 days of application and 80% within 170 (over-the-counter and plan-reviewed together; the City's records do not separate them).
Days from application to issue, measured by Kolmo from City of Redmond residential building permits (types New, Addition, Remodel, Deck) on the City's EnerGov self-service portal.
In the source's own words
“Additions, alterations and remodel.”Source ↗verified 2026-05-29
Required submittals
- Site plan (Redmond Residential Addition Site Plan example)
- Building permit plan set (foundation, floor plan, framing, elevations, roof plan, structural)
- Landscape plan (if applicable)
Inspection sequence
- Foundation/footing
- Plumbing rough-in
- Electrical rough-in
- Mechanical rough-in
- Framing
- Insulation
- Drywall
- Final
Contractor specialties needed
General contractor · Electrician (journey-level 01 or residential 02) · Plumber · Mechanical contractor
Who can do this work in Redmond?
Kolmo Construction is a licensed Washington general contractor — KOLMOL*753JS, active through April 10, 2027, bonded and insured — working throughout Redmond and King County. Kolmo prepares the drawings and submittals, files the home addition permit with Redmond Planning and Community Development, carries the project through review and inspections, and performs the construction. Call (206) 410-5100 for a Redmond home addition quote.
Notes & caveats
2021 IRC R301 governs framing. WSEC R402.1 sets envelope requirements. New conditioned space requires Manual J HVAC sizing. Lateral load path continuity required for vertical additions.
Addition permit fee estimate in Redmond
Worked example for a $120,000 home addition project (building permit). Your actual fee scales with project valuation.
| Building permit fee | $2,208.02 |
| Plan review | $1,435.21 |
| Technology surcharge | $145.73 |
| WA state surcharge | $6.50 |
| Estimated total | $3,795.46 |
Redmond prices an addition's building permit on the value of the work: $1,285.25 for the first $50,000 plus $14.01 for each $1,000 more up to $100,000, and $1,984.02 for the first $100,000 plus $11.20 for each $1,000 more up to $500,000. Plan review is 65% of that fee, plus Planning review of a residential addition, $324.01, and the fire fee for residential construction, additions and remodels, $796.48. Electrical, mechanical and plumbing permits are separate City permits, each from a $140.71 base fee. A 4% technology surcharge applies to the total, plus the $6.50 state building code fee (2026 fee schedules). Apply through the Redmond ePermitting Service, REPS (cityofredmondwa-energovweb.tylerhost.net/
How to apply yourself
- 1. Confirm your parcel's zoning & overlays. Run an address lookup for your home addition in Redmond — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline, critical-area or historic overlays.
- 2. Assemble submittals: the 3 documents under Required submittals above.
- 3. Submit through the city portal: Redmond Planning and Community Development ↗
- 4. Track review. Respond to reviewer comments promptly.
- 5. Pay issuance fees (about $3,795 for a $120,000 project) and pick up the permit. Inspection card travels with the job.
Or have Kolmo do it
Kolmo prepares the drawings and submittals, files with Redmond Planning and Community Development, handles reviewer comments, and builds the project.
Licensed WA general contractor KOLMOL*753JS · bonded & insured
Addition permits in Redmond — FAQ
When does a home addition need a permit in Redmond?
Additions, alterations, and remodels require a building permit with a site plan. Garage conversion to living space also requires a permit. All trade (electrical/plumbing/mechanical) and fire sub-permits must be completed and passed before the Building Final.
How much does a home addition permit cost in Redmond?
For a $120,000 home addition project, the estimated Redmond permit fee is about $3,795.46 (building fee $2,208.02 + plan review $1,435.21 + surcharges) from Redmond's adopted fee schedule. Land use, fire and engineering review, intake, impact and utility fees, where they apply, are charged separately.
How long does it actually take to get a home addition permit in Redmond?
33 permits issued in the last 12 months: half were issued within 97 days of application and 80% within 170 (over-the-counter and plan-reviewed together; the City's records do not separate them). Measured by Kolmo from City of Redmond residential building permits (types New, Addition, Remodel, Deck) on the City's EnerGov self-service portal.