Seattle Pre-Approved DADUs

Eight city-approved plans. One team from dirt to keys.

Every plan here has already cleared SDCI code review, so your permit moves in weeks instead of months. Pick a design, then price it for your lot in the estimator below.

One-Story Studio pre-approved Seattle DADU
Pre-ApprovedFast-Track Permit

One-Story Studio

SDCI Plan ID: Pre-Approved SetDesign: Haas Development / Urban Cottage

Vaulted 288 sq ft starter with a full kitchen and bath. Built to scale up to one or two bedrooms later.

Sq Ft288
Bed / BathStudio / 1
Permit2–4 wks
Est. Seattle turnkey$92K – $109KFlat lot · Builder Standard
One-Story One-Bedroom pre-approved Seattle DADU
Pre-ApprovedFast-Track Permit

One-Story One-Bedroom

SDCI Plan ID: Pre-Approved SetDesign: Haas Development / Urban Cottage

A private bedroom and clerestory light under a modern shed roof. The bedroom can shift to suit tricky lots.

Sq Ft432
Bed / Bath1 / 1
Permit2–4 wks
Est. Seattle turnkey$138K – $164KFlat lot · Builder Standard
Cedar Cottage pre-approved Seattle DADU by CAST Architecture
Pre-ApprovedFast-Track Permit

Cedar Cottage

SDCI Plan ID: Pre-Approved SetDesign: CAST Architecture

Single-level living with flush thresholds and a covered porch. A two-bedroom version is available.

Sq Ft467–636
Bed / Bath1–2 / 1
Permit2–4 wks
Est. Seattle turnkey$149K – $177KFlat lot · Builder Standard
Seattle DADU pre-approved plan by Artisans Group
Pre-ApprovedFast-Track Permit

Seattle DADU

SDCI Plan ID: Pre-Approved SetDesign: Artisans Group

An accessible one-bedroom planned around aging in place and energy efficiency, styled to blend with any block.

Sq Ft600
Bed / Bath1 / 1
Permit2–4 wks
Est. Seattle turnkey$192K – $228KFlat lot · Builder Standard
MOA Family ADU pre-approved plan by Mobile Office Architects
Pre-ApprovedFast-Track Permit

MOA Family ADU

SDCI Plan ID: Pre-Approved SetDesign: Mobile Office Architects

Two bedrooms over two levels, with built-in seating and storage that make 850 sq ft live like a family home.

Sq Ft850
Bed / Bath2 / 1
Permit2–4 wks
Est. Seattle turnkey$272K – $323KFlat lot · Builder Standard
The Family pre-approved Seattle DADU by Ahouse Studio
Pre-ApprovedFast-Track Permit

The Family

SDCI Plan ID: Pre-Approved SetDesign: Ahouse Studio

A flexible two-story layout that grows to three bedrooms and fits lots as narrow as 30 ft.

Sq Ft808–964
Bed / Bath2–3 / 2
Permit2–4 wks
Est. Seattle turnkey$259K – $307KFlat lot · Builder Standard
Two-Story pre-approved Seattle DADU
Pre-ApprovedFast-Track Permit

Two-Story

SDCI Plan ID: Pre-Approved SetDesign: Haas Development / Urban Cottage

A full-size home on a 16 × 32 ft footprint. Bedrooms upstairs, open living below, and a low flat-roof profile.

Sq Ft1,000
Bed / Bath2 / 1.5
Permit2–4 wks
Est. Seattle turnkey$320K – $380KFlat lot · Builder Standard
Schooner pre-approved Seattle DADU by Fivedot Architects
Pre-ApprovedFast-Track Permit

Schooner

SDCI Plan ID: Pre-Approved SetDesign: Fivedot Architects

A clean two-story form sized for a family of four. Mirrors, rotates and adapts to sloped sites.

Sq Ft1,000
Bed / Bath2 / 2
Permit2–4 wks
Est. Seattle turnkey$320K – $380KFlat lot · Builder Standard
Construction Analytics

Turnkey cost engine

Pick a plan or a size, then set slope and finish. Pricing, budget split, rent and permit timing update instantly from GenPro's Seattle build data.

Plan loadedOne-Story StudioOne-Story One-BedroomCedar CottageSeattle DADUMOA Family ADUThe FamilyTwo-StorySchoonerCustom buildCustom buildCustom buildCustom buildCustom buildCustom buildCustom buildCustom build
2883004004324675006007008008088509001,000 sq ft
Pre-approved plan

or set a custom size

sq ftDADU max 1,000 sq ft
Site slope

Steep ECA lots need a geotechnical report and SDCI critical-area review, and usually a pin pile foundation. We scope this during the feasibility visit.

Finish level

Budget breakdown

  • Site Prep / Civil Utilities
  • Framing & Structural
  • Interior MEP & Finishes
  • SDCI Permitting / Engineering
Total turnkey price range
Est. monthly rental income   gross yield ·
Permit timeline comparison
Pre-approved plan2–4 weeks + ECA review
Custom design6–9 months + ECA review

Save ~5–9 months of permit time with a pre-approved plan.

Planning estimates only, not a bid. Final pricing follows a site visit, survey and lot review. Rental income uses Seattle citywide average rents by bedroom count (Rentometer, June 2026) with a new-construction range applied.