ADU Design Resource · Edmonds, WA
The Complete Guide to
Building an ADU in Edmonds, WA
Everything Edmonds 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 Edmonds, WA ADUs
Market Context
Edmonds has a median home value of $530,000. Adding an ADU typically increases that by 35% — approximately $185,500 in added equity. A 1-bedroom ADU in Edmonds rents for approximately $1,693/month in the Snohomish County rental market , yielding a 5.2% cap rate on the investment. Occupancy averages 92% in this market.
Top Edmonds neighborhoods for ADU investment include Perrinville - Seaview, Westgate, Chase Lake, East Edmonds, Pine Park. Larger, treed lots and single‑family parcels make Perrinville ideal for detached ADUs. A high concentration of 1950s–60s single‑family homes near transit and services supports ADU conversions and rentals.
Permit Process
Permit applications are reviewed by the Planning and Development , with a plan check timeline of approximately 8 weeks. Permit fees in Edmonds range from $11,382 to $21,636 depending on project scope. Design review: Yes - in historic districts only
Edmonds properties within the Coastal Overlay Zone require a Coastal Development Permit (CDP) in addition to standard building permits. CDPs add 2–6 months to the permit timeline and require compliance with both local ordinances and applicable state coastal zone management standards.
Homeowners west of Highway 99 or near the bluffs often get caught off guard by the Shoreline Master Program overlay, which triggers a Coastal Development Permit review on top of the standard building permit — this alone can tack on 6-8 weeks since it runs through a separate approval track before Planning and Development will even issue the building permit. Because Edmonds sits in Seismic Zone D1, older homes with a basement or garage conversion ADU often need a structural engineer to verify the existing foundation before the city will approve attaching new framing to it, which surprises people who assumed their ADU would just piggyback on the existing structure. Also, Snohomish County's side sewer connection rules mean if your ADU adds a bedroom, Public Works may require a side sewer capacity check or upgrade — a step that's easy to miss since it's a county requirement layered on top of the city's own permit process.
"In my experience, that $300/sqft and 8-week figure are Edmonds-area estimates rather than verified local numbers, so I'd get at least two contractor quotes and call Planning and Development directly before penciling in a budget or start date; and since your lot sits in the coastal overlay, plan on the CDP review adding real weeks (sometimes months) beyond that permit timeline. — Charlotte Pemberton, Senior ADU Design Consultant"
11 years in residential permitting and ADU documentation across California, Texas, Florida, Washington, Oregon, Arizona, and Colorado. This guide was researched and verified against Edmonds's building department records and current 2026 Washington's HB 1337 ADU law.
Property Eligibility
Is My Edmonds, WA Property Eligible for an ADU?
Edmonds 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 Edmonds under Washington's HB 1337 (2023). No owner-occupancy requirement in Edmonds — 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 Planning and Development.
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 Edmonds's local rules. Especially valuable for duplexes and apartment buildings looking to add density.
HOA-Governed Properties
Approximately 15% of Edmonds 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.
Coastal Zone Properties
Properties within Edmonds's Coastal Overlay Zone require a Coastal Development Permit (CDP) in addition to standard building permits. This adds 2–6 months to the timeline. Our drawings flag coastal requirements and meet both local and applicable state coastal zone management standards.
Historic Districts
Yes - in historic districts only
Always verify eligibility with Planning and Development before designing.
Free — No Obligation
Will Edmonds Approve an ADU on Your Lot?
Send us the address and we’ll check it against Edmonds’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 Edmonds 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
Edmonds ADU Return Calculator — Built With 2026 Local Data
Pre-loaded with verified Edmonds 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 × 35% 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: Planning and Development (source ↗), Zillow Rental Market Reports, and public state/local housing data. Last verified: 2026-07-12.
Local Market Data
Top Edmonds Neighborhoods for ADU Investment
Perrinville - Seaview
Larger, treed lots and single‑family parcels make Perrinville ideal for detached ADUs.
Westgate
A high concentration of 1950s–60s single‑family homes near transit and services supports ADU conversions and rentals.
Chase Lake
Central residential neighborhood with good access to SR‑99 and local retail—strong single‑family lot opportunity for ADUs.
East Edmonds
Inland, versatile single‑family parcels with lower median values make East Edmonds cost‑effective for ADU builds.
Pine Park
Established residential area near Fifth Avenue South with single‑family density and neighborhood amenities that attract renters.
Downtown Edmonds
Strong rental demand from waterfront/ferry access, walkable shops and events increases ADU income potential despite smaller lot footprints.
Sherwood Forest
Suburban single‑family lots and family demand make Sherwood Forest well‑suited for detached ADUs.
Esperance
Lower median prices and mid‑century lots near Lake Ballinger offer affordable ADU development opportunities.
Edmonds Bowl
Scenic residential area with single‑family homes where owners may add ADUs for rental income or multigenerational use.
Talbot Park
High‑value coastal neighborhood where ADUs are attractive for ‘aging in place’ and premium short‑term or long‑term rentals.
Edmonds ADU Market at a Glance
Local Zoning Rules
2026 Edmonds ADU Rules
Edmonds's 2026 ADU ordinance caps new units at 1,200 sq ft and 24 ft of height — in the typical range most ADU floor plans are designed around. Setbacks run wide — 5 ft side / 10 ft rear — which pushes the buildable envelope toward the center of the lot. Because of Edmonds's Seismic Design Category D1 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 run $11,382–$21,636 — among the higher permit costs we track, and plan check takes about 8 weeks at Planning and Development. Submit directly to the department online — link below.
| Regulation | Edmonds Allowance |
|---|---|
| Max ADU Size | 1,200 sq ft |
| Max Height | 24 ft |
| Side Setback | 5 ft |
| Rear Setback | 10 ft |
| Architect / Engineer Stamp | Required for structural — Edmonds's Seismic Design Category D1 classification |
| Owner Occupancy | Not required |
| Short-Term Rental | Permitted |
| Coastal Overlay | Yes — CDP may be required |
| Design Review | Yes - in historic districts only |
| HOA Prevalence | 15% of properties |
| Permit Fees | $11,382–$21,636 |
*Load-bearing modifications to the existing house always need an engineer stamp regardless of ADU size. Data verified 2026-07-12T23:00:00.000Z. Always confirm with the Planning and Development before designing.
Edmonds Permit Process
Edmonds ADU Permit Timeline & Fees
ℹ Timeline and fee estimates are based on Washington state averages. Actual Edmonds data coming soon.
Local Financing Resources
Local ADU Lenders in Edmonds
These lenders offer HELOC, construction, and renovation loans for ADU projects in Snohomish County. Compare terms before committing.
Offers HELOCs up to 90% LTV with a 10-year draw period, though they do not offer separate construction loans.
Visit Lender ↗Provides mortgage and home equity products for renovations in Washington through their Edmonds branch.
Visit Lender ↗Offers HELOCs up to $500,000 with interest-only payments during a 10-year draw period and fixed-rate options.
Visit Lender ↗Explicitly lists accessory dwelling units (ADUs) as eligible for their construction and major renovation financing.
Visit Lender ↗Specialty ADU marketplace offering HELOCs and renovation loans based on after-renovation value.
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 Edmonds
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 Edmonds 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 Planning and Development.
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 Planning and Development. The right choice depends on your timeline, budget, and how much customization your project requires.
Drawing Package Details
What's Included in Your Edmonds ADU Package
Engineered for WA Permit Approvals
What You Get
Edmonds ADU Drawings — What's Included
How our permit-ready drawing sets compare to hiring a local architect in Edmonds:
| 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
- ✓Coastal Zone supplement
- ✓2 rounds of revisions
- ✓Priority 5-day turnaround
The Done-For-You Path
Want Your Edmonds 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 $1,693/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 Edmonds'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 Planning and Development. 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 Edmonds.
Build costs reflect local construction data for Edmonds. Client names are initials only. Permit timelines are project-specific and may vary.
"Drawings were ready on day 9. I submitted to the city the same week. The reviewer called them the cleanest ADU set he'd seen in months."
"Our garage conversion is now renting at $1,850/month. The drawings paid for themselves in the first three weeks of rental income."
"Our JADU was the easiest part of the whole project. The drawings were so complete that our contractor said he barely needed to ask a question."
Representative scenarios. Build costs modeled using Edmonds construction data (city-verified data) and Planning and Development. Outcomes vary by project scope and site conditions.
Building Code
Edmonds Climate Zone & Energy Code
Washington State Energy Code (WSEC) — 2021 WSEC Residential (effective March 15, 2024): a state-adopted energy code based on the 2021 IECC that sets prescriptive and performance-based energy-efficiency requirements for residential buildings (including ADUs).
Compare Cities
Edmonds vs. Nearby Washington Cities
| City | Build Cost/sqft | Permit Fees | 1BR ADU Rent | Cap Rate | Eligibility |
|---|---|---|---|---|---|
| Edmonds ← you | $300 | $11,382+ | $1,693/mo | 5.2% | Free check → |
| Everett | $375 | $3,458+ | $1,450/mo | 6% | View → |
| Marysville | $320 | $3,000+ | $1,750/mo | 5.2% | View → |
| Lynnwood | $500 | $3,000+ | $1,836/mo | 3.2% | View → |
| Lake Stevens | $300 | $7,997+ | $1,450/mo | 5.2% | View → |
Frequently Asked
Edmonds ADU Questions
How much does it cost to build an ADU in Edmonds? +
What is the maximum ADU size allowed in Edmonds? +
How long does the ADU permit process take in Edmonds? +
Do I need owner-occupancy to build an ADU in Edmonds? +
What's the rental income potential for an ADU in Edmonds? +
How much does it cost to get ADU drawings in Edmonds? +
What drawings are required for an ADU permit in Edmonds? +
Can I convert my garage to an ADU in Edmonds? +
Does Edmonds have a coastal overlay for ADUs? +
What neighborhoods in Edmonds are best for ADU investment? +
Is Edmonds ADU-friendly? +
How much will an ADU increase my property value in Edmonds? +
Can I use my Edmonds ADU as a short-term rental (Airbnb / VRBO)? +
Does Edmonds's seismic zone affect ADU construction requirements? +
Where do I submit ADU plans in Edmonds? +
More Services in Edmonds
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