2025 ADU Investment Cheat Sheet
Note: Final price depends on site conditions (slope, utilities) and finishes.
Does Your Lot Qualify?
Backyard Cottages & Investment Suites
What is Your Goal?
Passive Income & ROI
Maximize the new 'Two Units Per Lot' allowance. Build a high-yield rental DADU that pays your mortgage. We specialize in durable, tenant-proof finishes and separate utility metering.
Aging in Place & Dignity
Keep mom and dad close, but independent. We build single-story, accessible "Granny Flats" with universal design (curbless showers, wide doors) right in your garden.
2025 Project Estimates
*Estimates vary based on site conditions (slopes, utility variance), finish level, and jurisdiction. Book a Feasibility Study for an exact quote.
We Speak "Code" So You Don't Have To.
The HB 1337 Unlocked
Washington State now allows two ADUs per lot in urban growth areas. We know how to design site plans across the Puget Sound that maximize this density, whether it is two detached units or a combination of attached and detached, without triggering expensive variances.
Navigating Local Jurisdictions
From the hills of Bellevue to the residential zones of Tacoma, every building department has unique quirks. We have the experience to navigate permits across 20+ local jurisdictions.
The "Condo" Opportunity
Did you know you can now legally sell your DADU separately? In many Puget Sound jurisdictions, 'condo-ization' allows homeowners to turn a backyard cottage into a sellable asset while keeping their primary residence independent. We assist with the Unit Lot Subdivision process from start to finish.
The Custom Stick-Built Cottage
Built on-site to match your main home's architecture perfectly. Our DADUs offer 50-year durability and superior structural integrity compared to modular boxes. We specialize in custom floor plans that maximize natural light and flexible living spaces.
The Garage Conversion
The fastest path to ROI. We handle the complex "Change of Use" permits required to turn your cold, underutilized garage into a warm, legal, income-generating apartment or a high-end home office.
The Accessible Multi-Gen Suite
A "Forever Home" in your backyard. We design with Universal Design principles featuring zero-step entries, 3-foot wide doorways, and reinforced medical-grade backing for luxury hardware. Ideal for aging parents or family members needing a safe, independent space.
Frequently Asked Questions
- Often, yes. King County typically requires septic capacity for 150 gallons per day per bedroom. We handle the engineering tests to confirm your system's limits.
- It varies by city. Auburn and Kent are currently faster than Seattle. We typically see 3-5 months for permits, and 4-6 months for construction.
- Yes. While we specialize in custom stick-built for longevity, we can install high-quality prefab units if speed is your primary goal.