ADU & DADU builder in Issaquah.
Hillside lots between Cougar, Squak and Tiger Mountain, where slopes, creeks and tree cover shape where a backyard home can sit — sited, permitted and built by one team. DIGS is a design-build ADU contractor: we design, permit and build custom ADUs, DADUs (backyard cottages) and homes across Issaquah and the surrounding Greater Seattle area — owner-led from the first call through final inspection.
What to know about an ADU in Issaquah.
Issaquah sits at the south end of Lake Sammamish between Cougar, Squak and Tiger Mountain, so steep slopes, Issaquah Creek and its tributaries, and heavy tree cover often decide where a DADU can go. Master-planned neighborhoods such as Issaquah Highlands and Talus also have their own covenants, so we check those alongside city code before drawing anything.
HOA rules and ADUs in Washington →- Permits
- City of Issaquah, applied for through MyBuildingPermit.com
- Power
- Puget Sound Energy
- County
- King County
- Where we build
- Issaquah Highlands · Talus · Olde Town · Squak Mountain · Montreux · South Cove
Every trade your Issaquah build needs — one team.
ADU & DADU Construction
Experts in constructing Attached and Detached Accessory Dwelling Units for versatile living spaces.
Site Development
Land preparation for construction, including grading, excavation, and utility installation.
Excavation
Digging and removing earth or rocks to prepare the construction site.
Groundwork
Initial preparation of land, including excavation and foundational activities.
Concrete & Foundations
Building strong foundations with high-quality concrete for durable construction projects.
Civil Work
Construction activities related to infrastructure, such as roads, bridges, and utilities.
A local builder who knows Issaquah.
Headquartered in Monroe, WA 98272, DIGS has spent 37+ years building across King and Snohomish County. We know the local zoning, critical-area rules, setbacks and how Issaquah reviews and permits — so your project never stalls at an unfamiliar counter.
Experienced Team
37+ years of local building, with deep familiarity with Seattle, King and Snohomish County code.
Customizable Designs
Ready-made plans you can adapt — or a fully custom design drawn to your lot and lifestyle.
Clear, Honest Pricing
Line-item estimates, no hidden fees, and no scope changes without your sign-off in writing.
Honest Communication
Real-time project visibility and a builder who is always reachable by phone, email or text.
ADU & DADU guides for Issaquah homeowners
- ADU Rules on the Eastside: Bellevue, Kirkland and Redmond →
- Can You Build an ADU on a Septic System? →
- Two ADUs or a Fourplex? What You Can Build on a Seattle Lot →
- Washington’s ADU Laws: What Changed and What It Means for You →
- Can You Sell a DADU Separately in Washington? →
- Can I Build an ADU on My Lot? →
- How Much Does It Cost to Build a DADU in Seattle? →
- Does Building an ADU Raise Your Property Taxes? →
- ADU vs. Home Addition: Which Is Right for You? →
- What Does an ADU General Contractor Actually Do? →
- Tiny House vs. ADU in Washington: What You Can Actually Put in Your Backyard →
Also building ADUs & DADUs near Issaquah
Seattle, WA · Bellevue, WA · Redmond, WA · Kirkland, WA · Sammamish, WA · Bothell, WA · Kenmore, WA · Woodinville, WA · Shoreline, WA · Lynnwood, WA · Everett, WA · Snohomish, WA · Monroe, WA · Lake Stevens, WA · Mukilteo, WA
Building an ADU in Issaquah — the basics.
Who issues the ADU or DADU permit in Issaquah, WA?
For an address inside Issaquah city limits, the City of Issaquah's permit office reviews and issues the permit under the city's own ADU code. Unincorporated parcels nearby go through King County instead, under different rules, size limits and fees — so the jurisdiction line is the first thing a feasibility study confirms.
How much does a DADU cost to build in Issaquah?
A fully permitted, professionally built detached ADU in Issaquah and the surrounding Greater Seattle area typically runs $375,000 to $600,000+ all-in — design, permitting, site work and construction. Where a specific lot lands in that range is decided by site conditions: slope, soils, utility distances and tree or critical-area constraints.
What should I know before building an ADU in Issaquah?
Issaquah sits at the south end of Lake Sammamish between Cougar, Squak and Tiger Mountain, so steep slopes, Issaquah Creek and its tributaries, and heavy tree cover often decide where a DADU can go. Master-planned neighborhoods such as Issaquah Highlands and Talus also have their own covenants, so we check those alongside city code before drawing anything.
Does DIGS build ADUs and DADUs in Issaquah?
Yes. DIGS Construction and ADU Builder is headquartered in Monroe, WA and has built across King and Snohomish County since 1989, including Issaquah. Owner Eric Dexter leads every project personally from the first call through final inspection, and quotes are all-in with site work included.
More answers in the ADU & DADU FAQ, or estimate a Issaquah project with the ADU cost calculator.
“Eric and his team did a fantastic job clearing out some land to make it usable and prepping areas just how we needed them. The results look great.”
Building in Issaquah? Let's talk.
Tell us about your lot and your goals. Eric follows up personally — the same person from the first call through final inspection. No pressure, no obligation.
- Owner-led — 37+ years, 100+ homes built
- Clear, line-item pricing · no hidden fees
- Serving Seattle, King & Snohomish County