ADU Construction in Kenmore
Professional adu construction services in Kenmore and surrounding areas • Licensed & Insured • Free estimates
TopVolk Construction builds DADUs and attached ADUs in Kenmore, WA — owner-led by Vladislav Volkov, WA Licensed Contractor, 100+ projects completed since 2017.
Last updated June 2026
Kenmore ADU Construction — Add a Rental Unit to Your Lot
Statewide ADU reform under WA HB 1337 (2024) now lets most Kenmore single-family lots support up to two ADUs — detached, attached, or basement conversions — and TopVolk Construction has been building them across King County since 2017. Kenmore's stock of 1960s and 1970s ranch homes on 7,000–10,000 sq ft lots near the Burke-Gilman Trail corridor is well-suited for a rear-yard DADU: the lot depth is usually there, side and rear setbacks are workable, and City of Kenmore permit review typically moves faster than Seattle SDCI. Units near Log Boom Park and along Juanita Drive NE are renting for $1,600–$2,200 per month, given proximity to Bothell and Kirkland tech employment. Rental yield math here is hard to ignore. For mechanical, a Mitsubishi mini-split handles heating and cooling in a 600–800 sq ft unit without running new ductwork through an existing house. Vladislav Volkov handles every project directly — no sales staff, no project manager middleman. Call (206) 591-1096 to schedule a free on-site consultation.
Most of Kenmore falls in zip code 98028, with the eastern edge bordering Bothell's 98011 corridor along the Sammamish River Trail. The housing stock divides clearly by era: post-war ramblers and split-levels built from 1955 to 1975 dominate the hillside neighborhoods above Lake Washington, while the flatter parcels near NE 181st Street and 68th Avenue NE have seen more 1980s and 1990s infill construction. Older homes in the 98028 core often have post-and-pier or shallow perimeter foundations, which limits what's feasible for a basement conversion ADU — you may need to upgrade the crawlspace with a vapor barrier and DriCore subfloor before any finished living space is viable. Kenmore's ~37 inches of annual rainfall, concentrated from October through May, puts real demands on exterior envelope details: Hardie cement-board siding and proper flashing at rim joists matter here more than in a drier climate. City of Kenmore handles its own building permits through its Community Development department — separate from King County DPER — with plan review typically running 4–8 weeks for a standard DADU application.
Common ADU Construction Concerns in Kenmore
Setback and Lot Coverage Limits Catching Homeowners Off Guard
WA HB 1337 changed a lot statewide, but it didn't eliminate setbacks or lot coverage limits. City of Kenmore requires a minimum 5-foot side and 5-foot rear setback for a DADU, and lot coverage caps — typically 40–45% of the parcel — can restrict what's buildable when the existing house already occupies a large footprint. FAR (Floor Area Ratio) calculations also apply: the ADU's square footage counts toward the total allowable. On the 1960s rambler lots near NE 145th Street, a detached garage conversion sometimes sidesteps these constraints because it works within an existing footprint rather than adding new lot coverage. Vladislav measures the lot and all existing structures on the first site visit and flags any constraint before plan work begins. That catches problems before they become expensive permit denials. Typical buildable DADU footprint in Kenmore runs 500–800 sq ft given these limits.
Water and Sewer Connection Decisions for a Kenmore DADU
Most Kenmore parcels are served by Northshore Utility District for water and King County Metro for sewer. Adding a DADU triggers a decision: shared utility connection off the main house lateral, or a separate meter and service tap. Shared connections cost less upfront — typically $3,000–$6,000 for rough-in plumbing inside the ADU using Uponor PEX-A supply lines — while a separate utility tap runs $8,000–$15,000 or more depending on distance to the main and any road-cut permit requirements from the city. Owner-occupied rental scenarios often favor shared connections for simplicity. Separate connections make more sense if you're planning to eventually sell the ADU unit independently, which WA HB 1337 now permits. We schedule the King County Metro sewer inspection as part of the permit package — timeline from rough-in inspection to utility sign-off typically runs 3–5 weeks.
City of Kenmore Permit Process: What the Timeline Actually Looks Like
Kenmore runs its own permit center — not King County DPER, not Seattle SDCI. The city's Community Development department reviews all ADU applications, and a new DADU requires a full building permit package: site plan, floor plans, structural drawings, and a Washington State Energy Code (2021 edition) compliance worksheet. Plan review for a straightforward DADU runs 4–8 weeks. Projects on slopes, near critical areas, or with structural complexity can push to 10–12 weeks. Kenmore doesn't have a formal pre-approved ADU plan program. TopVolk prepares the full permit package — site plan, framing details, energy compliance documentation — as part of every project. Vladislav coordinates directly with the city's plan reviewer when correction comments come back, which cuts revision cycles by weeks. Budget 4–6 months total from permit submittal to final inspection on a ground-up DADU. We are a WA Licensed Contractor active in all King County permit jurisdictions.
ADU Construction Costs in Kenmore: What Actually Moves the Number
Ground-up DADU construction in Kenmore typically runs $180–$280 per sq ft, so a 600 sq ft unit lands between $108,000 and $168,000 before permit fees, utility connections, and site work. Basement or crawlspace conversions come in lower — $65,000–$110,000 for a complete, code-compliant unit — but foundation conditions on those 1960s homes often add scope: vapor barrier, DriCore subfloor, and structural reinforcement can push the number by $10,000–$20,000. Finish level matters more than most homeowners expect. Bosch appliances, quartz countertops, and large-format porcelain tile add $15,000–$30,000 over builder-grade spec. TopVolk quotes are line-item, not ballpark ranges — you see exactly what the MEP rough-in, R-49 ceiling insulation, drywall, and finish work each cost. Deadline penalties are written into the contract. At $1,800/month in rent, a $130,000 DADU pencils out to a 16.6% gross annual return on construction cost.
Moisture Control and Envelope Details That Determine Long-Term Durability
North-facing DADU walls in Kenmore develop moss and surface mildew within 2–3 years without proper exterior detailing. Hardie cement-board siding handles the region's ~37 annual inches of rainfall far better than untreated cedar or standard LP SmartSide on exposed elevations. Ground-contact sill plates need pressure-treated (PT) lumber. Flashing at any ledger board connection is non-negotiable. A continuous air barrier at the sheathing layer matters for both moisture control and energy code compliance. Inside wet areas, Schluter Kerdi membrane in the shower and RedGard on wet-wall tile backers prevent the moisture intrusion that's almost guaranteed to cause structural damage within 5–7 years in PNW conditions if skipped. For mechanical, Mitsubishi mini-split heat pumps handle dehumidification in Kenmore's long shoulder seasons better than gas furnaces paired with a separate dehumidifier. Proper detailing at the time of rough-in costs a fraction of what remediation costs five years later.
Frequently Asked Questions
How fast can you get to Kenmore for ADU construction?▼
Kenmore is a straightforward drive — SR-522 connects directly, and the typical run from our base is 25–40 minutes depending on traffic. King County is a core service area, so Kenmore projects aren't delayed by distance or a travel premium. For an initial site visit, we're typically available within 1–2 weeks of first contact. Construction start depends on where you are in the City of Kenmore permit process — plan on 4–8 weeks of city review before a shovel goes in the ground on a new DADU. Call (206) 591-1096 to schedule a free on-site walkthrough with Vladislav directly.
What does ADU construction in Kenmore cost per project?▼
A ground-up DADU in Kenmore runs $108,000–$168,000 for a 600 sq ft unit at $180–$280 per sq ft, depending on finish level and site conditions. Attached ADU or basement conversions land lower at $65,000–$110,000 complete, though crawlspace conditions on older homes regularly add scope. Permit fees, Northshore Utility District connection costs, and structural engineering run separate — typically $8,000–$20,000 additional. TopVolk provides a line-item written quote at no charge after a site visit, not a vague estimate range. Call (206) 591-1096 to get exact pricing tied to your specific lot and existing structure.
What permits does an ADU require in Kenmore, WA?▼
All ADU permits in Kenmore go through the City of Kenmore Community Development department — not King County DPER. A new DADU requires a full building permit with site plan, floor plans, structural drawings, and a Washington State Energy Code compliance worksheet. Utility connections involve separate review from Northshore Utility District (water) and King County Metro (sewer), each with their own fees. Standard plan review runs 4–8 weeks. TopVolk prepares the complete permit package on every project — structural plans, energy compliance docs, site plan — and Vladislav manages the review cycle directly with city staff. We are a WA Licensed Contractor covering all permit jurisdictions across King County.
Should I build a detached ADU or convert my basement in Kenmore?▼
Basement conversions cost less — $65,000–$110,000 versus $108,000–$168,000 for a ground-up DADU — but the 1960s and 1970s homes common in the 98028 zip often have shallow crawlspaces rather than full basements, which limits that path. A detached ADU gives tenants more privacy and eliminates shared-wall noise issues, which matters for longer-term rentals near the Burke-Gilman Trail corridor. Under WA HB 1337, you can combine one attached and one detached ADU on the same lot, so a phased approach over several years is also viable. The right call depends on your lot, foundation conditions, and rental strategy. Vladislav walks through the tradeoffs on the first site visit — call (206) 591-1096 to set that up.
What warranty do you provide on ADU construction in Kenmore?▼
TopVolk provides a workmanship warranty covering structural and finish work, confirmed through a blue tape walkthrough and formal punch list before final payment is released. Manufacturer warranties pass through directly: Mitsubishi mini-splits carry 5–12 year compressor warranties when registered, Schluter Kerdi membrane is backed by a lifetime warranty, and Hardie siding carries a 30-year limited warranty against defects. What's not covered: tenant damage, deferred maintenance, or modifications made after project completion. Kenmore's wet winters make installation quality the deciding factor in whether those manufacturer warranties hold up — proper vapor barriers, flashing, and PT lumber at ground contact are what separate a durable ADU from one that needs remediation inside a decade.
Do you serve areas near Kenmore for ADU construction?▼
Yes — Kenmore sits centrally within our King County coverage area. TopVolk builds ADUs in Bothell, Kirkland, Shoreline, Lake Forest Park, Woodinville, and Redmond, and we also cover Snohomish County cities like Mill Creek, Lynnwood, and Edmonds for larger projects. No travel premium applies for Kenmore or neighboring cities — all King County projects run on the same schedule queue. Projects typically start 3–6 weeks after permit issuance. To check current availability and get a site visit scheduled, call (206) 591-1096. Vladislav handles scheduling directly.
Ready to start your ADU Construction in Kenmore?
Free on-site consultation with Vladislav. Line-item pricing — no vague ranges.
ADU Construction Services in Kenmore
ADU design
Permit processing
Foundation work
Complete construction
Why Choose TopVolk Construction LLC in Kenmore?
Licensed & Insured
Fully licensed contractor with comprehensive insurance coverage for your peace of mind.
Local Service
Serving Kenmore and surrounding areas with fast response times and local expertise.
Direct Communication
Work directly with Vladislav - no middlemen, clear expectations, honest recommendations.
Quality Guaranteed
100+ projects completed since 2017. Full responsibility with penalties for missed deadlines.
15% OFF All Labor
Book your renovation this week and save on labor costs.
Materials priced separately at cost.
We Also Serve Nearby Cities
What Our Kenmore Customers Say
Vlad and his team did an amazing job! They built our deck in just 3 days—no issues at all. Communication was easy, and Vlad helped us choose right deck planks. Installation was quick and flawless. Highly recommend!
Really happy with the service! Vlad was easy to communicate with and helped us to find the best garage door opener. The installation was quick and he did a perfect job. A few months later, I had a question and he came by the same day - even on a weekend. That kind of follow-up is rare these days!
Vlad replaced a bathroom exhaust fan and gave me a reasonable quote up front with no hidden fees. While replacing the fan, he discovered a plumbing vent issue causing mold. He fixed the pipe and treated the mold at a reasonable cost. I really appreciate his honesty!
Outstanding work done by Vlad and team for our home cabinet/living room interior work. Very professional and reasonable charges. Love the service.
We hired TopVolk for a full kitchen remodel and couldn't be happier. From the initial consultation to final walkthrough, Vlad was professional and attentive to every detail. The result exceeded our expectations!
Excellent bathroom renovation! Vlad completed the project on time and on budget. His attention to detail and craftsmanship is outstanding. We'll definitely hire him again for future projects.