CENTRAL DISTRICT · DADU
DETACHED ADU Builder in Central District, Seattle
A detached accessory dwelling unit (DADU) is a fully independent residence on your existing single-family lot. We design and build DADUs that meet rental code, hold long-term value, and look like they belong — not like a kit dropped in the yard. Every project starts with a feasibility study and ends with a turn-key handover.
Build timeline
6–8 months
Typical sqft
400–1,000 sqft
Seattle cost
$140K – $400K
Typical lot
4,500 sf
What detached adu looks like on a Central District lot
Central District lots commonly fall under NR2, NR3, LR1, LR2, LR3. Dominant architectural style: Craftsman / modern infill. Very high — central location
- ✓Stamped architectural set
- ✓Structural + MEP engineering
- ✓Permit submittal & city liaison
- ✓Foundation, framing, weather envelope
- ✓Finish carpentry, cabinetry, fixtures
- ✓Final inspection + warranty package
Other services in Central District
Every Golden State service, localized to Central District
DETACHED ADU in nearby neighborhoods
DETACHED ADU across Seattle
Central District DADU feasibility — $1,500
Lot analysis, Seattle zoning verification, and a fixed price for your Central District project.
Book Central District feasibilityFrequently asked
Can I build an ADU in Central District, Seattle?
Yes — every residential-zoned lot in Central District qualifies for at least one ADU under RCW 36.70A.681 and Seattle's implementing code. Variables in Central District specifically: (1) lot size and shape — Central District has a mix of original platted lots and post-1960 subdivisions, which changes setback geometry; (2) tree retention — mature Central District trees over a measured DBH may require an exceptional-tree review; (3) historic overlay — pockets of Central District are in a conservation overlay that adds design review. We pre-check all three at feasibility.
What does an ADU cost in Central District?
Central District ADU all-in cost tracks Seattle citywide medians: $300–$400/sqft for a turn-key 1-bedroom DADU. Central District-specific variables include alley access (lowers crane and material handling cost ~$4–9K), older sewer mains (occasionally require side-sewer repair adding $6–18K), and tree-protection fencing. We have built in Central District every year since 2017 and our bid accuracy on Central District lots is within ±8% of contract on 90% of jobs.
Go deeper: Read the Five hidden ADU costs that wreck Puget Sound budgets guide
What rent will a Central District ADU generate?
2026 Central District 1-bedroom DADU rents land in the band typical for the surrounding Seattle submarket, generally $2,050–$3,150/mo long-term with a 5–10% premium for true detached privacy over attached units. Mid-term furnished rates run 15–25% higher when within walking distance of transit or a hospital corridor. Our Central District rental comps update quarterly from on-market and recently-leased pulls.
How long does a Central District ADU project take end-to-end?
Signed feasibility to keys in hand for Central District projects: 9–14 months — 6–8 weeks design, 10–16 weeks Seattle permit, 18–26 weeks construction. Central District lots with alley access tend to finish at the fast end because staging and crane setup are simpler. Lots requiring driveway construction or grading run the long end. Gantt at contract, weekly updates throughout.
Go deeper: Read: Long-term vs. short-term rental ADU in Seattle
What's special about building in Central District vs other Seattle neighborhoods?
Three Central District-specific factors: (1) the typical lot age — pre-1950 Central District lots often have undersized water services (3/4") that require upsize; (2) the tree canopy — Central District's mature canopy means exceptional-tree review is more likely than in post-1990 Seattle neighborhoods; (3) the soil — Central District's position on the Puget Lowland glacial till usually supports slab-on-grade. Our Central District field experience streamlines all three.
Go deeper: Read the Seattle Design Review for ADUs: when it applies (2026) guide
Are there any HOA restrictions in Central District?
Central District is partly HOA-governed and partly fee-simple. Where HOAs apply, RCW 64.38.034 (effective 2024) blocks outright ADU bans, but ARBs can impose design covenants (siding material, roof pitch, façade articulation). We submit design concepts to ARBs in parallel with permit submittal, adding 4–8 weeks. Most Central District HOAs approve when the DADU echoes the primary house's siding and roof material.
What permits and reviews trigger for Central District ADUs?
Standard Seattle ADU permit + side-sewer + addressing + water capacity. Central District-specific: tree-protection plan if any tree ≥24" DBH is within the construction zone; critical-areas screening if Central District portion borders a mapped stream, wetland, or steep slope; drainage review if new impervious exceeds threshold (more likely on small Central District lots). We pre-screen all three before submittal.
Go deeper: Read the King County side sewer permits for ADUs: cost & timeline (2026) guide
Can I do a basement ADU in a Central District house?
Often yes — Central District's housing stock includes many pre-1970 homes with full basements ranging 6'-2" to 8'-0" ceiling height. Basements ≥7'-0" with achievable egress windows convert cleanly at $145–$220K. Lower ceilings (<7'-0") require underpinning to lower the slab — adds $35–$65K plus permit complexity. We measure ceiling and check IRC R310 egress feasibility during initial site visit.
Does Central District's zoning allow two ADUs?
Depends on the underlying zone — Seattle's middle-housing implementation under HB 1110/1337 allows two ADUs on most residential lots in Central District (DADU + AADU, two AADUs, or stacked DADU). The combined cap is typically 2,000 sqft. Some Central District subareas with critical-area overlays restrict to one ADU. We confirm zone designation and count at feasibility against your specific address.
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