Accessory Dwelling Units (ADUs) in Boise & the Treasure Valley
More space. More income. More value.
Accessory Dwelling Units (ADUs) are one of the smartest investments an Idaho homeowner can make. TH Builds designs and builds detached ADUs, garage conversions, and in-law suites that generate rental income, add property value, and give your family flexible space.
Call or Text: 208-996-8812What to Expect
An Accessory Dwelling Unit (ADU) is a secondary living space on your property—and in today's Idaho market, it's one of the highest-ROI projects you can pursue. TH Builds handles the full process: zoning research, permit applications, design, construction, and final inspection. Whether you want a detached backyard cottage, a garage-to-apartment conversion, or a finished basement suite, we build ADUs that look and function like full custom homes—not afterthoughts. Our investor clients typically see rental income that covers the cost of the project within 5-7 years.
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How We Work Together
Every project follows a proven process that keeps you informed and in control from day one.
Zoning & Feasibility
We research your city's ADU ordinances, setback requirements, and utility hookup rules so you know exactly what's possible before spending a dollar.
Design & Permits
We develop a design that maximizes your space and meets all code requirements, then handle all permit submittals and agency coordination.
Full Construction
Foundation, framing, all mechanical systems, insulation, interior finishes, appliances—we build your ADU to the same standard as a primary residence.
Certificate of Occupancy
We see the project through final inspection and certificate of occupancy so your unit is legally rentable the day we hand you the keys.
Full-Service Accessory Dwelling Units (ADUs)
We handle every aspect of your accessory dwelling units (adus) project so you have a single point of contact from design through completion.
Customer feedback about TH Builds · Google review excerpt
“The quality of work was excellent and the attention to detail really shows.”
Common Questions
Are ADUs legal in Boise and the Treasure Valley?
Yes. Boise, Meridian, Eagle, Nampa, and most Treasure Valley cities now allow ADUs on single-family lots. Rules vary by city—we research your specific parcel before anything else.
How much does an ADU cost?
A detached ADU typically runs $180,000–$350,000+ depending on size, complexity, and finishes. A garage conversion is often $80,000–$160,000. We provide detailed estimates before committing.
What's the rental income potential?
In the Boise market, well-built ADUs typically rent for $1,200–$2,500/month for long-term tenants, and significantly more for short-term rentals in desirable areas.
Ready to Start Your Accessory Dwelling Units (ADUs) Project?
Contact TH Builds for a free, no-obligation consultation. We'll visit your home, listen to your vision, and provide a detailed estimate.