ADU & DADU Construction in Seattle, WA
Professional adu & dadu construction services for homeowners in Seattle and throughout King County. Licensed General Contractor serving Seattle & the Puget Sound.
ADU & DADU Construction Services in Seattle
Seattle is the Pacific Northwest’s largest city, known for its tech-forward community, progressive sustainability values, and diverse housing stock. The rainy, mild climate makes Passive House construction especially valuable—airtight building envelopes eliminate drafts and moisture problems while slashing heating costs by up to 90%.
Love Construction provides premium adu & dadu construction services throughout Seattle and King County. Our boutique design-build approach ensures every project receives personalized attention and expert craftsmanship.
What We Offer in Seattle
- Detached ADUs (DADUs) and backyard cottages up to 1,000 sq ft
- Attached ADUs including basement conversions and garage conversions
- Passive House performance with ultra-low energy costs
- Full kitchens, bathrooms, and living spaces designed for independent living
- Aging-in-place design with accessible features and single-floor layouts
- Rental-ready finishes with separate entrances and utilities
Zip Codes We Serve in Seattle
98101, 98102, 98103, 98104, 98105, 98106, 98107, 98108, 98109, 98112, 98115, 98116, 98117, 98118, 98119, 98121, 98122, 98125, 98126, 98133, 98134, 98136, 98144, 98146, 98154, 98164, 98174, 98177, 98178, 98195, 98199
Why Choose Love Construction for ADU & DADU Construction in Seattle?
- Generate rental income of $1,500-$2,500+/month in the Seattle market
- House aging parents or adult children close by with privacy and independence
- Near-zero energy costs with Passive House construction
- Increase property value by $150,000-$300,000+ in Seattle
- Take advantage of Seattle’s progressive ADU zoning allowances
- 5-year warranty on labor with Built Green certified construction
- Licensed WA Contractor (LOVECC*802N4 · Love Construction LLC)
ADU & DADU Construction FAQ for Seattle Homeowners
What is a DADU vs. an ADU?
An ADU (Accessory Dwelling Unit) is a smaller, self-contained living unit on a property with a primary home. A DADU (Detached Accessory Dwelling Unit) is a freestanding structure—a backyard cottage. Seattle allows both types on most single-family lots.
How much does an ADU cost to build in Seattle?
ADU costs in Seattle typically range from $200,000-$400,000 for a DADU, depending on size and finishes. Attached ADUs can range from $100,000-$250,000. Our Passive House ADUs cost slightly more upfront but have near-zero energy costs.
What are Seattle’s ADU rules?
Seattle allows both an attached ADU and a detached ADU (DADU) on most single-family lots—meaning up to three dwelling units on one property. DADUs can be up to 1,000 sq ft. We handle all zoning research and permitting.
Can a Passive House ADU really have near-zero energy costs?
Yes. A well-built Passive House ADU in Seattle’s mild climate can have total heating and cooling costs under $20/month. Many of our ADU clients add a small solar array to achieve true Net Zero.
Do you serve all of Seattle?
Yes! We provide adu & dadu construction services throughout Seattle and all of King County. We serve zip codes 98101, 98102, 98103, 98104, 98105, 98106, 98107, 98108, 98109, 98112, 98115, 98116, 98117, 98118, 98119, 98121, 98122, 98125, 98126, 98133, 98134, 98136, 98144, 98146, 98154, 98164, 98174, 98177, 98178, 98195, 98199 and surrounding areas.
ADU & DADU Construction in Nearby Areas
Get a Free ADU & DADU Construction Quote in Seattle
Contact Love Construction today. We serve Seattle and all of King County.