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COST_SPEC / SHORELINE

Shoreline ADU Cost: What Homeowners Should Budget For

Real Shoreline, WA pricing for detached and attached ADUs across six lot-size bands. Numbers reflect current bids and recent projects, not internet averages.

Last verified 2026-05-15 · Page in progress — not yet indexed

COST_TABLE / PLANNING ESTIMATES

We're verifying Shoreline's cost data this quarter. Contact us for a current estimate on your specific lot.

Numbers above are planning estimates from current bids and recent Golden State ADU projects on Puget Sound lots — they are not city-published fees. Verify current Shoreline permit and utility fees against the official sources linked below before committing a budget.

FAQ / SHORELINE COST

Shoreline ADU pricing questions

  • What does a typical detached ADU cost in Shoreline?

    Shoreline all-in detached ADU pricing varies by lot size and site complexity. Send your address for a same-week range.

    Go deeper: Shoreline ADU cost breakdown

  • What's included in the Shoreline construction line?

    Construction in Shoreline is priced separately from design, permits, and site work so each line is visible.

    Go deeper: Shoreline ADU overview

NAV_GRAPH / Local data

Shoreline resources

CITY_DOSSIER / SHORELINE· 47.7557°N 122.3415°W

Built in Shoreline — what we know that the spec sheet won't tell you.

A live dossier from our field PMs: the permit counter, the soils, the bylaw that just changed, and the streets where ADUs are already cash-flowing.

Map · King CountyOpen ↗
Shoreline
Drive-time from yard · ≈ 16 min via I-5© OpenStreetMap contributors
Population58,608
Median lot7,100 sq ft
ADU permits / yr54 (2024)
Build cost band$330–360 / sq ft
Right now in Shoreline
Air quality · US AQI
Source · Google Maps PlatformAffects pour windows + finish schedule
LIVE_INTEL / SHORELINE · 6 SIGNALS
Pour-feasibility · todayLoading
—
/ 100 · Awaiting feed
  • Weather feed loading
Derived live · Shoreline weather + AQI
Sun rhythm · ShorelineDaylight
5:25 AM
9:06 PM
15h 41m daylight
Golden hour · 8:19 PM
98% of June peak
NOAA solar formulas · computed
Moon · cure-week planner—
—
Loading

We track lunar weeks for slab pours — clear nights drop ambient temperature faster, which slows surface curing. Schedule wet slabs midweek under waxing light.

Conway approx · computed
Seismic · 24h within 60 miLoading
USGS earthquake.usgs.gov
On-site clock · Shoreline—
—:—
— · Pacific

Loading. Our standard crew window is 7:00–17:00 weekdays — noise ordinances in most Puget Sound cities allow exterior power tools only inside that band.

America/Los_Angeles · live
Build-rules pulseWithin window
7:00–17:00
Power-tool window · Mon–Fri
—
ADU permits YTD pace
——

Sunday exterior work is restricted in most Puget Sound jurisdictions. We sequence interior trades around it.

Shoreline municipal code · annualized
SPEC_02 / CITY_INTEL

Environmental & locational intelligence

03 / SOLAR_POTENTIAL

Rooftop solar at this address

04 / POLLEN_FORECAST

Tree · Grass · Weed (3-day)

05 / WALK_SCORE

0.5-mile amenity density

06 / NWS_ALERTS

Active NWS weather alerts

LOCATIONAL_INTEL / SHORELINE
Drive times from ShorelineLoading

Calculating live drive times to four metro anchors…

Real commute time matters for ADU rent comps — and for our crews. We keep installs within a 60-minute radius of our Puget Sound yard.

Data provenance

Drive times pulled live from the Google Routes API (traffic-aware matrix). Each request is timestamped so you can see exactly when the numbers were last refreshed — no stale brochure data.

Google Routes API · traffic-aware
Street view · ShorelineLive imagery
Recent Google Street View imagery centered near Shoreline

Lot context matters as much as zoning. We pre-screen access, slope, and tree canopy from imagery before scheduling the site visit.

Google Street View · proxied
Tidal window · ShorelineLoading

Waterfront lots: shoreline excavation and barge access windows depend on these. We schedule pours away from extreme low tides when the soils dry unevenly.

NOAA · — mi away
Recent permits · ShorelineLoading

Open-data signal of nearby construction velocity — useful for ADU comps and for anticipating examiner workload.

data.seattle.gov · ~3 mi radius
Permit counter · Shoreline
Shoreline Planning & Community Development
17500 Midvale Ave N, Shoreline 98133
Mon–Fri 8a–5p · pre-app required for DADUs
(206) 801-2500Department site ↗
Local zoning quirk

“Light-rail station-area overlays allow taller DADUs (up to 30 ft) within ½ mile of 145th St & 185th St stations.”

Sourced from Golden State ADU field PMs · WA Lic. GOLDESA747LZ
Best build window
Late April → October

Bar shows pour-friendly months · dot marks the current month.

  • Seismic
    SDC D · stable till uplands
  • Soil
    Vashon till predominant
  • Climate
    ≈38″ rain · mild, lake-moderated
  • Topography
    Mostly flat or gentle slope
  • HOA prevalence
    ≈ 14%
Neighborhoods we build inSee all ↗
Transit signal
1 Line Lynnwood Link — 145th & 185th stations open

Station-area lots earn the largest rent premium in this market.

School signal
Shoreline School District

Rental yield estimate: $2,500–3,100 / mo — station-area premium

Local incentive

Station-area overlay reduces parking minimums to zero

Hidden gem

“DADUs within 800 ft of a Link station are pre-leasing on framing.”

Build cost · Shoreline vs Puget Sound
+$20 vs regional median
$250 / sqftShoreline ≈ $345$425 / sqft
Other cities we hold a permit history in
COST_SHORELINE / FULL

Get a full Shoreline ADU cost breakdown — line by line, not a range.

Shoreline's permit fees, soils and design review costs swing 20%+ between blocks. We'll send the breakdown for your specific address, not a citywide average.

  • Shoreline permit + impact fees included
  • Allowance schedule for finishes attached
  • Free 1-pager, no sales call required
Replies within 1 business day
WA Lic. GOLDESA747LZBuilding since 2012
Direct line · Golden State ADU(425) 642-4142

We reply within 1 business day. No spam, ever.

◇ No sales script · No spam · Your details stay with our team