ADU Design in Seattle, WA
Seattle's construction market is driven by tech-campus expansion, port and maritime industry, and a wave of multifamily and mixed-use infill. The city sits in the Cascadia subduction zone and enforces one of the strictest energy codes in the country.
Best price · Quotes back fast · PE stamps backed by Apex Grid Engineering
ADU plans, start to permit
Site plan, floor plans, elevations, structural design, and energy compliance — the complete drawing set your city needs to approve an accessory dwelling unit.
Designed for ADU rules
Many states now streamline ADU approvals with state-level rules on size, setbacks, and fees. We design to the current rules in your jurisdiction so nothing gets kicked back.
Fast and affordable
ADUs are small projects — they shouldn't carry big-firm fees or timelines. Lean process, best price, quotes back fast.
Project types
- Tech office campuses and tenant improvements
- Mid-rise and high-rise multifamily
- Life-science and research labs
- Waterfront and maritime industrial
- Hospital and healthcare expansions
- Mass-timber mixed-use
Everything else your project needs
MEP Engineering in Seattle
Mechanical, electrical & plumbing design — permit-ready drawings, best price.
Structural Engineering in Seattle
Structural design, analysis & PE stamping — permit-ready drawings, best price.
Civil Engineering in Seattle
Site civil & land development — permit-ready drawings, best price.
PE Stamping in Seattle
Licensed PE stamps on your plans — fast turnaround, best price.
Pool Engineering in Seattle
Pool structural, systems & permits — engineered for plan check approval.
Engineering Cost Guide in Seattle
Straight answers on what engineering really costs.