Home Addition Drawings · Kenmore, WA
Permit-Ready Home Addition
Drawings for Kenmore, WA
Expand your home with a permitted room addition, second story, or family room extension. We deliver complete, code-compliant drawing sets for Kenmore's building department — 14-day money-back guarantee.
14-day money-back guarantee · permit-ready delivery
Local Intelligence
What Kenmore Homeowners Need to Know Before Submitting
Size & Zoning Rules
Any new square footage added to your Kenmore home counts against the same zoning envelope that governs ADU size, meaning large additions may affect your ability to add a future ADU. Kenmore's current ADU size cap is 1,500 sq ft — generous enough to accommodate most project types.
Kenmore does not impose an owner-occupancy requirement, so you can rent both the main home and any ADU or conversion as investment units.
If the addition creates a second unit or is later converted to a rental, Kenmore's ADU market supports approximately $1,987/month for a 2-bedroom unit.
Permit Process & Fees
Addition permit packages submitted to Development Services must include a site plan, floor plans, all four elevations, an electrical plan, and energy compliance documentation — plus stamped structural drawings are always required for any load-bearing elements, second-story work, or new foundation.
Visit Development Services ↗Construction Cost Context
Kenmore's home addition construction costs run $200–$420 per square foot — a wide range driven by labor markets, local code complexity, and finish level. Our drawings are priced at a fraction of what a full-service architect would charge to produce the same permit set.
⚠ Common Pitfall in Kenmore
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.
Expert Verdict — Marcus Reid, Licensed Designer
"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."
Market Context
Kenmore has a median home value of $900,000. Comparable renovation projects in this market typically add 25% to resale value.
Neighborhoods in Kenmore with the strongest home addition and resale value potential 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.
Permit Process
Permit applications are reviewed by the Development Services.
Kenmore falls within Seismic Design Category D, which affects structural requirements for any new addition tying into the existing structure.
Local Financing Resources
Local Home Addition Lenders in Kenmore
These lenders offer HELOC, construction, and renovation loans for home addition 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 Home Addition Contractors in Kenmore
We draw the plans. These contractors build the addition. 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.
Free — No Obligation
What Will Kenmore Let You Add?
Setbacks, lot coverage, and height limits decide your addition before a single line is drawn. Send us the address and we’ll tell you what’s actually approvable — free, before you commit to a design.
- ✓Maximum footprint your lot and setbacks allow
- ✓Lot-coverage and height limits in Kenmore
- ✓Whether your addition triggers structural or energy upgrades
- ✓Realistic plan-check timeline for your project
- ✓A straight answer within 48 hours
Review My Project — 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.
Drawing Package Details
What's Included in Your Kenmore Home Addition Package
What You Get
What's in Your Kenmore Home Addition Package
One-time fee, no retainer, no hourly billing — your exact scope and price confirmed on a free call.
- ✓Site plan
- ✓Floor plans (existing + proposed)
- ✓All 4 elevations
- ✓Electrical plan
- ✓Title 24 energy compliance
- ✓PDF + DWG delivery
- ✓10 business day turnaround
- ✓Everything in Starter
- ✓Stamped structural drawings
- ✓Foundation plan
- ✓Roof framing plan
- ✓Window & door schedules
- ✓1 round of revisions
- ✓Everything in Standard
- ✓3D rendering
- ✓Cross-section details
- ✓Material specifications
- ✓HOA submission package
- ✓2 rounds of revisions
- ✓Priority 5-day turnaround
After You Order
Your Addition Drawings in 3 Steps
Submit Your Project Details
Share your property address, existing floor plan (if available), and the addition scope. We assign your project coordinator within 4 business hours.
We Draft Your Drawings
Our team designs your complete addition drawing set — engineered for Kenmore's building department requirements and WA CBC code. Delivered in 10 business days.
Submit to Your Building Dept
Download your complete package and submit to Development Services. We support plan check corrections at no extra charge.
Common Questions
Kenmore Home Addition FAQs
Do I need a permit for a home addition in Kenmore? +
Yes — any structural addition to your home in Kenmore requires a building permit. This applies to room additions, second-story additions, sunrooms, and attached garages. You'll need permit-ready drawings before the building department will accept your application. Our packages are formatted specifically for Kenmore's submittal requirements.
How much does a home addition cost in Kenmore? +
Home additions in Kenmore typically cost between $150–$400 per square foot depending on the scope, finishes, and structural complexity. A 600 sq ft addition ranges from $90,000 to $240,000. Second-story additions cost more than ground-floor extensions due to structural requirements. Contact us to discuss drawing package options for your project.
What drawings are required to permit a home addition in Kenmore? +
Kenmore's building department requires: a site plan showing the addition's footprint and setbacks, floor plans for all affected levels, all four exterior elevations, an electrical plan, and energy compliance (Title 24 in California). Structural plans stamped by a licensed engineer are required for any load-bearing elements — included in our Premium package.
How long does the permit process take for a home addition in Kenmore? +
Plan check in Kenmore typically takes 8 weeks for home additions. Additions with structural components may require additional review. Complete, code-compliant drawings significantly reduce correction cycles — each cycle adds 3–6 weeks. Our drawings are engineered to pass on the first submittal.
What setbacks apply to home additions in Kenmore? +
Kenmore enforces minimum setbacks from property lines for all additions: typically 4–5 ft side setbacks and 5 ft rear setbacks, though these vary by zoning district and lot size. Your addition must stay within the buildable envelope. Our site plan documents existing and proposed setbacks and flags any zoning variances required.
Do I need structural drawings for a home addition in Kenmore? +
Yes, for most additions. Any load-bearing walls, new foundations, second-story construction, or roof structure changes require stamped structural drawings from a licensed engineer. California's CBC (California Building Code) and seismic requirements make structural plans mandatory for most addition types. Our Standard and Premium packages include stamped structural drawings.
How much do home addition drawings cost in Kenmore? +
Our permit-ready home addition drawing packages for Kenmore include everything your building department requires — floor plans, elevations, structural, and energy compliance. Every package is engineered for WA code compliance and formatted for Kenmore's building department. 14-day money-back guarantee.
Will a home addition increase my home's value in Kenmore? +
In Kenmore, where median home values are approximately $900,000, a permitted home addition adds square footage that appraisers value as part of the home's gross living area. Return on investment varies by addition type — master suite additions, family room expansions, and additional bedrooms typically recoup 50–75% of project cost in appraised value in WA markets.
Can I add a second story to my home in Kenmore? +
Second-story additions are permitted in most Kenmore residential zones, subject to height limits and design review requirements. California generally requires ministerial permit approval, but some cities impose design compatibility or neighborhood compatibility review for second stories. Our drawings cover all levels including foundation upgrades, shear walls, and roof framing required for vertical additions.
Also Available in Kenmore
Adding an ADU instead? See our ADU design service.
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.