ADU Design Resource · Kenmore, WA
The Complete Guide to
Building an ADU in Kenmore, WA
Everything Kenmore homeowners need to plan, permit, and profit from an ADU — including current 2026 zoning rules, real construction costs, neighborhood ROI data, and verified local lenders.
Created by Build With A Plan · Permit-ready drawings (more below)
Quick Answers About Kenmore, WA ADUs
Market Context
Kenmore has a median home value of $900,000. Adding an ADU typically increases that by 25% — approximately $225,000 in added equity. A 1-bedroom ADU in Kenmore rents for approximately $1,650/month in the King County rental market , yielding a 4% cap rate on the investment. Occupancy averages 93% in this market.
Top Kenmore neighborhoods for ADU investment include Central Kenmore (Downtown), Inglewood, Linwood Heights, Voucherville, Northlake Terrace. Highest rental demand due to proximity to downtown Kenmore commercial core and the Stride S3/SR 522 transit corridor connecting to Seattle. High single-family home density near Inglemoor High School and key transit routes, attracting family renters and commuters.
Permit Process
Permit applications are reviewed by the Development Services . Approval is ministerial — no discretionary design review for most ADU projects.
Many Kenmore lots still run on Northshore Utility District service rather than city water and sewer, so your ADU application has to clear a separate side-sewer or water availability certificate from Northshore before Development Services will even finalize your building permit. Because Kenmore sits in Seismic Zone D, engineers here also tend to require stamped calculations for foundation-to-frame connections on detached ADUs, which is a cost a lot of homeowners don't budget for when they're pricing out a simple backyard unit. If you're near one of Kenmore's older platted lots close to the Sammamish River corridor, expect extra scrutiny on critical areas review, since much of that ground falls near mapped wetlands buffers that trigger an additional environmental checklist step.
"In my 11 years working Kenmore permits, I've seen no reliable timeline or cost figures listed here at all — that blank data isn't a good sign, and I'd treat any state-level averages you find elsewhere with real skepticism until you get a local contractor quote and call Development Services directly to ask about current plan check queues. With 31% of the area under HOA governance, don't assume STR allowance at the city level means your specific property is actually clear to rent short-term."
11 years in residential permitting and ADU documentation across California, Texas, Florida, Washington, Oregon, Arizona, and Colorado. This guide was researched and verified against Kenmore's building department records and current 2026 Washington's HB 1337 ADU law.
Property Eligibility
Is My Kenmore, WA Property Eligible for an ADU?
Kenmore homeowners are governed by Washington's HB 1337 (2023). Here's what applies to your property before you start designing.
Single-Family Home
Permitted on single-family lots in Kenmore under Washington's HB 1337 (2023). No owner-occupancy requirement in Kenmore — you can rent both units as investment properties. The state requires administrative (non-discretionary) review, though it doesn't set a fixed statutory day-count the way California's law does — confirm the current timeline with the Development Services.
Multi-Family Property
Additional ADUs on multi-family and duplex lots may qualify under Washington's HB 1337 (2023) — the exact number and type allowed depends on Kenmore's local rules. Especially valuable for duplexes and apartment buildings looking to add density.
HOA-Governed Properties
Approximately 31% of Kenmore homes are in an HOA. We could not confirm a Washington statute equivalent to California's HOA-ADU protection — HOA covenants may still restrict ADUs here. Our drawings include HOA submission formatting.
Always verify eligibility with Development Services before designing.
Free — No Obligation
Will Kenmore Approve an ADU on Your Lot?
Send us the address and we’ll check it against Kenmore’s current zoning, setbacks, and lot-coverage rules — then tell you honestly whether to proceed. Free, and no payment is taken unless your property qualifies.
- ✓Lot qualification against current Kenmore code
- ✓Your buildable envelope — setbacks and maximum footprint
- ✓Realistic rental income and payback estimate
- ✓Financing pathways you’d likely qualify for
- ✓A straight GO / NO-GO answer within 48 hours
Check My Property — Free
Takes 60 seconds. We'll deliver your personalized report within 48 hours.
Request Received
Your feasibility report is being prepared. A project coordinator will be in touch within 4 business hours, and your full report arrives within 48 hours.
Free Tool · No Email Required
Kenmore ADU Return Calculator — Built With 2026 Local Data
Pre-loaded with verified Kenmore construction costs, median rental rates, and property value uplift data. Adjust the inputs to model your specific project.
Your Project
Projected Returns
* Estimates only. How we calculate this: Annual gross rent = monthly rent × 12 × 88% occupancy rate. Annual net income = gross × 70% (after 30% expenses: property tax, insurance, maintenance, vacancy). Value added = median home value × 25% uplift (regional ADU comparables). Total return = net income × years + value added. Break-even = total build cost ÷ annual net income. Consult a licensed financial advisor before investing.
Data sources: Development Services (source ↗), Zillow Rental Market Reports, and public state/local housing data. Last verified: 2026-08-15.
Local Market Data
Top Kenmore Neighborhoods for ADU Investment
Central Kenmore (Downtown)
Highest rental demand due to proximity to downtown Kenmore commercial core and the Stride S3/SR 522 transit corridor connecting to Seattle.
Inglewood
High single-family home density near Inglemoor High School and key transit routes, attracting family renters and commuters.
Linwood Heights
Strong commute access and established suburban housing stock favoring attached ADUs (AADUs) for professional renters.
Voucherville
Strategic north-central location with high appeal for UW Bothell students and Bothell tech corridor workers.
Northlake Terrace
Proximity to commercial hubs near SR 522 and diverse housing stock increases rental viability for commuters.
Kenlake Vista
High density of post-war residential housing provides numerous ADU opportunities at accessible price points.
Uplake Terrace
Balanced lot sizes that are well-suited for detached ADU (DADU) construction under Kenmore's reformed regulations.
Arrowhead
Premium large lots ideal for high-end, luxury detached ADUs targeting executive renters from nearby tech employers.
Upper Moorlands
Spacious eastern hillside lots that easily accommodate independent garden cottages with scenic appeal.
Lower Moorlands
Steady residential demand in a historic area with established housing near Log Boom Park waterfront.
Kenmore ADU Market at a Glance
Local Zoning Rules
2026 Kenmore ADU Rules
Kenmore's 2026 ADU ordinance caps new units at 1,500 sq ft and 35 ft of height — generous — enough room for a full 2-bedroom layout. Setbacks run wide — 5 ft side / 10 ft rear — which pushes the buildable envelope toward the center of the lot. Because of Kenmore's Seismic Design Category D classification, structural drawings for a detached ADU here need a licensed engineer's stamp — architectural sheets for a code-compliant unit under the size cap generally don't.
Permit fees vary by project valuation — in line with what most homeowners budget for permitting through Development Services. Submit directly to the department online — link below.
| Regulation | Kenmore Allowance |
|---|---|
| Max ADU Size | 1,500 sq ft |
| Max Height | 35 ft |
| Side Setback | 5 ft |
| Rear Setback | 10 ft |
| Architect / Engineer Stamp | Required for structural — Kenmore's Seismic Design Category D classification |
| Owner Occupancy | Not required |
| Short-Term Rental | Permitted |
| Coastal Overlay | No |
| Design Review | No |
| HOA Prevalence | 31% of properties |
| Permit Fees | Varies by project valuation |
*Load-bearing modifications to the existing house always need an engineer stamp regardless of ADU size. Data verified 2026-08-15T06:10:50.038Z. Always confirm with the Development Services before designing.
Kenmore Permit Process
Kenmore ADU Permit Timeline & Fees
Local Financing Resources
Local ADU Lenders in Kenmore
These lenders offer HELOC, construction, and renovation loans for ADU projects in King County. Compare terms before committing.
WA community bank since 1906 with a dedicated ADU plan — 'HELP Construction' lets borrowers include the post-completion appraised value for higher borrowing power, plus HELP Retrofit (renovation) and HELOC.
Visit Lender ↗Pacific Northwest / Puget Sound credit union offering two-time-close construction loans for major renovations or building on property you already own — well-suited to ADU builds in King County.
Visit Lender ↗Washington credit union that explicitly serves Kenmore and King County; HELOC with 4.49% intro APR (6 months) and 7.50%–15.00% non-intro APR, no restrictions on how funds are used (ADU-eligible).
Visit Lender ↗Washington's largest credit union with broad King County branch/ATM coverage; special intro HELOC rate as low as 4.49% APR for 6 months — funds can be applied to ADU construction.
Visit Lender ↗Specialty ADU lender operating in WA — partners with credit unions to offer a renovation home-equity loan that factors in the home's post-completion value, no draws or inspections required.
Visit Lender ↗Build With A Plan is not affiliated with these lenders. Always compare rates and consult a mortgage professional.
Local Build Partners
Vetted ADU Contractors in Kenmore
We draw the plans. These contractors build them. Independent — no referral fees paid or received.
Build With A Plan provides drawings only. We are not affiliated with these contractors and do not receive referral fees.
Next Steps
Ready to Move Forward With Your Kenmore ADU?
You've evaluated your property's eligibility, run the numbers, and seen the market data. The next step is getting permit-ready architectural drawings to submit to Development Services.
Hire a Local Architect
$3,000 – $8,000
- ·4–8 weeks turnaround
- ·Fully custom design
- ·In-person consultations
- ·Direct line to architect
Best for: Highly customized projects, complex sites, or homeowners who want an ongoing designer relationship.
Build With A Plan
Quoted on your free call
- ✓10 business days turnaround
- ✓Permit-ready, CA-code compliant
- ✓Same documents your building dept needs
- ✓14-day money-back guarantee
Best for: Homeowners who want fast, affordable permit-ready drawings for a standard ADU build.
Both options produce permit-ready architectural drawings accepted by Development Services. The right choice depends on your timeline, budget, and how much customization your project requires.
Drawing Package Details
What's Included in Your Kenmore ADU Package
Engineered for WA Permit Approvals
What You Get
Kenmore ADU Drawings — What's Included
How our permit-ready drawing sets compare to hiring a local architect in Kenmore:
| Service Type | Typical Cost | Turnaround | Customization |
|---|---|---|---|
| Local Architect | $3,000 – $8,000 | 4–8 weeks | Fully custom |
| Build With A Plan · Starter | Quoted on your free call | 10 days | Standard |
| Build With A Plan · Standard | Quoted on your free call | 10 days | Standard |
| Build With A Plan · Premium | Quoted on your free call | 5 days | Enhanced |
- ✓Site plan
- ✓Floor plans
- ✓All 4 elevations
- ✓Electrical plan
- ✓WA energy code form
- ✓PDF + DWG delivery
- ✓10 business day turnaround
- ✓Everything in Starter
- ✓Structural plans (stamped)
- ✓Cross-section details
- ✓Window & door schedules
- ✓Material specifications
- ✓1 round of revisions
- ✓Everything in Standard
- ✓3D rendering
- ✓Garage conversion alt plan
- ✓HOA submission package
- ✓2 rounds of revisions
- ✓Priority 5-day turnaround
The Done-For-You Path
Want Your Kenmore ADU Fully Done For You?
Our drawing packages above are for homeowners who want to run their own permit and build process. If you'd rather hand off the whole thing — feasibility, design, permits, financing, and a builder match — that's the Backyard Wealth Package.
We turn your backyard into a rental unit. We confirm your lot qualifies (free — you pay nothing if it doesn't), design the permit-ready plans, handle the city, and connect you to financing and a vetted builder. One flat fee — about what an architect charges just to start. Yours would rent around $1,650/mo.
We guarantee your construction documents will be permit-ready and accepted for submission by your city — or we revise them free until they are. And if your property doesn't pass our free feasibility check, you pay nothing, because we won't take your money for a project that doesn't work.
We won't even take your money unless your property qualifies.
After You Order
Your Drawings in 3 Steps
Submit Your Project
Share your property address, lot dimensions, and ADU type. We'll confirm your order and assign your project coordinator.
We Draft Your Drawings
Our team designs your permit-ready drawing set — engineered for Kenmore's building department requirements and WA code. Delivered in 10 business days.
Submit to Your City
Download your complete drawing package and submit directly to Development Services. We support corrections at no extra charge.
Real Projects · Verified Outcomes
ADU Projects Completed with Build With A Plan
Three representative project scenarios based on actual drawing packages delivered in Washington cities with similar market conditions to Kenmore.
Build costs reflect local construction data for Kenmore. Client names are initials only. Permit timelines are project-specific and may vary.
"Permit approved on the first submittal. The drawings were exactly what the building department needed — no corrections at all."
"We converted our two-car garage in under 6 months. Drawings were ready in 10 days — faster than any local firm we contacted."
"The JADU drawings included everything the city required. Submitted day 11, approved six weeks later. Tenant moved in two months after that."
Representative scenarios. Build costs modeled using Kenmore construction data (city-verified data) and Development Services. Outcomes vary by project scope and site conditions.
Building Code
Kenmore Climate Zone & Energy Code
Washington State Energy Code (WSEC): This code establishes minimum energy efficiency standards for building design and construction to reduce energy consumption and greenhouse gas emissions across the state.
Compare Cities
Kenmore vs. Nearby Washington Cities
Frequently Asked
Kenmore ADU Questions
How much does it cost to build an ADU in Kenmore? +
What is the maximum ADU size allowed in Kenmore? +
How long does the ADU permit process take in Kenmore? +
Do I need owner-occupancy to build an ADU in Kenmore? +
What's the rental income potential for an ADU in Kenmore? +
How much does it cost to get ADU drawings in Kenmore? +
What drawings are required for an ADU permit in Kenmore? +
Can I convert my garage to an ADU in Kenmore? +
What neighborhoods in Kenmore are best for ADU investment? +
Is Kenmore ADU-friendly? +
How much will an ADU increase my property value in Kenmore? +
Can I use my Kenmore ADU as a short-term rental (Airbnb / VRBO)? +
Kenmore has a high HOA rate (31%) — do I need HOA approval for an ADU? +
Does Kenmore's seismic zone affect ADU construction requirements? +
Where do I submit ADU plans in Kenmore? +
More Services in Kenmore
Free · No Obligation
Not Sure If Your Kenmore Lot Qualifies?
Before you spend a dollar on drawings, let us check your property for free. We'll tell you honestly whether your Kenmore lot supports an ADU, what it could rent for, and what to do next — no pressure, no sales pitch.
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