Serving the Greater Seattle Area
ADU & DADU

A Second Home In Your Backyard

Attached in-law suites and detached backyard cottages, designed to fit your lot and built to work with your home. We handle the design, the permitting, and the build.

5.0 ★★★★★

Get Your Free Estimate

No pressure, no obligation. We'll get back to you within one business day.

Or call (206) 941-6692 · Mon-Fri 7:30am-5:00pm

✓

We'll get back to you soon!

Expect a call or text within one business day.
In a hurry? Call (206) 941-6692.

Detached accessory dwelling unit built by Porter Homes
Accessory Dwellings

ADU & DADU

Accessory and detached dwelling units designed and built to fit the property they sit on. Whether it's a rental, an in-law suite, or space for multiple generations, we make the unit work with your home instead of against it.

The permitting is where most backyard-cottage projects stall. We handle it start to finish, so you get one team accountable for the design, the paperwork and the build.

  • Attached ADUs and in-law suites
  • Detached backyard cottages (DADU)
  • Rental and multi-generational units
  • Permitting handled start to finish
Explore Your Lot →
How It Works

From Lot To Move-In Day

Design & Permit

We design the unit to fit your lot and your goals, then handle the permit-ready plans and the paperwork.

Build

Framed and finished by the same in-house crew, built to the same standard as a full custom home.

Move In

A complete, livable unit ready to rent or move into, walked through together before we hand over the keys.

Our Work

Built By The Crew

Detached backyard cottage with cedar siding Cozy modern backyard cottage interior with a kitchenette Porter Homes crew framing a backyard build
★★★★★
"They set an incredibly high bar for professionalism. They shared very detailed and accurate plans and proposals, and the project was completed on time and on budget."

Seamus B. · Google review · Basement office build-out

FAQ

ADU & DADU Questions in the Greater Seattle Area

What's the difference between an ADU and a DADU?

An ADU (accessory dwelling unit) is attached to your home, like an in-law suite or converted space. A DADU is detached: a separate backyard cottage. We design and build both.

Can I rent out my ADU?

In most Eastside cities, yes, though the rules vary by city. We walk you through what your lot and your city allow during the design and permitting phase.

How big can I build a DADU on my lot?

It depends on your city's zoning and your lot. We assess it in a free consultation and design the unit to make the most of what's allowed.

Do you handle the ADU permitting?

Yes, start to finish: the design, the paperwork and the build, with one team accountable for all of it.

Explore Your Lot

Let's Talk About Your ADU

Rental income, family close by, or both, tell us your goal for the space and we'll tell you what your lot can do. Free consultation, no pressure.

(206) 941-6692Mon-Fri · 7:30am-5:00pm

Get Your Free Consultation

No pressure. No obligation. We'll get back to you fast.

We'll get back to you within one business day.

✓

We'll get back to you soon!

Expect a call or text within one business day.
In a hurry? Call (206) 941-6692.

Service Areas

Serving Greater Seattle & The Eastside

Based in Bellevue, WA, we build for homeowners from Newcastle up to north Edmonds. Free consultations throughout our entire service area.

Bellevue, WA · Mon-Fri 7:30am-5:00pm

Bellevue (HQ) Kirkland Redmond Bothell Woodinville Kenmore Mercer Island Medina Newcastle Issaquah Sammamish Seattle Shoreline Edmonds + Surrounding Areas