ADU & DADU Construction in Issaquah, WA
Professional adu & dadu construction services for homeowners in Issaquah and throughout King County. Licensed General Contractor serving Seattle & the Puget Sound.
ADU & DADU Construction Services in Issaquah
Issaquah sits at the base of the Cascade foothills, offering outdoor recreation and suburban convenience. The environmentally conscious community values sustainable building, making Passive House construction a natural fit. Cooler winters and wetter conditions make high-performance building envelopes essential.
Love Construction provides premium adu & dadu construction services throughout Issaquah and King County. Our boutique design-build approach ensures every project receives personalized attention and expert craftsmanship.
What We Offer in Issaquah
- 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 Issaquah
98027, 98029
Why Choose Love Construction for ADU & DADU Construction in Issaquah?
- 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 Issaquah 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 Issaquah?
Yes! We provide adu & dadu construction services throughout Issaquah and all of King County. We serve zip codes 98027, 98029 and surrounding areas.
ADU & DADU Construction in Nearby Areas
Get a Free ADU & DADU Construction Quote in Issaquah
Contact Love Construction today. We serve Issaquah and all of King County.