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A Pacent team member confirms your goals and schedules a visit at a time that works for you.
PACENT DESIGN X BUILD · SEATTLE & EASTSIDE
Seattle ADU
Contractor &
DADU Builder
Design, permits and construction for your backyard cottage, attached ADU or garage conversion, handled by one team from first sketch to move-in.
★★★★★ 5.0 on HouzzBBB A+ AccreditedLicensed & Insured
5.0 ★on Houzz
Best of Houzz2026 award
BBB A+Accredited business
4.9 ★on Google · 24 reviews
WA Lic.
#PACENC*791NQLicensed & insured GC
#PACENC*791NQLicensed & insured GC
What happens after you reach out
Book My Free Site Visit
Free on-site visit
We walk the property with you and look at placement, access, utilities and the rules that apply to your lot.
A clear plan and a property-specific estimate
You get recommended next steps and pricing based on your actual property. No pressure to sign.
RECENT ADU PROJECT
800 sq ft DADU in Burien, designed and built by Pacent
800sq ft3bedrooms2full bathsA–Zdesign-build
A move-in-ready backyard home built for full-time living. Pacent handled space planning, interior design, permit support, material selections and construction.
See the full projectWhat homeowners say
about working with Pacent
Which type of ADU fits your property?
Backyard cottage (DADU)
A separate backyard home with its own entrance. The most privacy for family or tenants. Built custom or from Seattle’s pre-approved DADU plans.
Check if this fits my lotAttached ADU
A self-contained unit added to or within your home. Family stays close, and everyone keeps their own space.
Check if this fits my lotGarage conversion
Turn an existing garage into a legal, livable unit.
Check if this fits my lotBasement ADU
Convert unused basement space into a private unit with its own entrance and kitchen.
Check if this fits my lotPopular usesAging parentsAdult childrenGuestsRental incomeHome office or studioAging in place
Eligibility depends on zoning and site conditions and is confirmed during your visit.
What we look at during your free site visit
You’ll leave the visit knowing what’s realistic for your lot and what the next step is.
- Zoning & lot rules
- Setbacks & buildable area
- Lot coverage & height
- Existing structures
- Trees & slope
- Utilities & sewer
- Construction access
- Drainage & critical areas
See our work in motion
One team from
design to move-in
Pacent designs, permits and builds your ADU in-house, so you’re not coordinating a separate designer and contractor.
With Pacent
- One point of contact from design to completion
- Design and construction on one timeline
- In-house interior designer for layouts and finishes
- Permit coordination handled for you
- Licensed & insured WA general contractor
Hiring separately
- Multiple companies to coordinate
- Designs that may not match the construction budget
- You manage the hand-offs
What shapes the cost of an ADU in Seattle?
Every lot is different, so we don’t quote from a price list. After your free site visit, you’ll receive a property-specific estimate before anything is signed.
Get My Property-Specific Estimate
The factors that move the budget most
- 1ADU type and size
- 2Site conditions: slope, soil, trees and access
- 3Utility and sewer connections
- 4Design complexity and finish level
- 5Permit and engineering requirements
ADU questions,
answered
Still have questions? Call (425) 749-8107 or email us.
Seattle ADU permit guidanceHow much does it cost to build an ADU in Seattle?
It depends on the ADU type, size, site conditions, utilities and finish level. After a free site visit, Pacent provides a property-specific estimate before anything is signed.
Is the site visit really free?
Yes. The initial site visit is free and carries no obligation. We use it to understand your goals and review the property conditions that shape feasibility, design and cost.
What areas do you serve?
Pacent serves Seattle, Bellevue and surrounding Eastside communities. Contact us with your address or ZIP code and we will confirm availability for your property.
Can you build from Seattle’s pre-approved DADU plans?
Yes, when a pre-approved plan fits the property and project goals. We can also develop a custom design when the lot, layout or homeowner priorities call for a different solution.
Do you offer a warranty?
Warranty coverage is reviewed with the construction agreement. Pacent also coordinates final inspections, project closeout and a detailed walkthrough before completion.
What is the difference between an ADU and a DADU?
An ADU is a secondary home attached to or located within the primary residence. A DADU is a detached backyard home on the same property.
YOUR PROJECT STARTS HERE
Start with a free visit to your Seattle property
Tell us what you are planning. We’ll review your goals, visit the property and help identify a realistic next step.
- One integrated design-build team
- Property-specific guidance
- Free, no-pressure initial visit
