Portland ADU Builders
Build a custom ADU with Lamont Bros.
Types of Portland ADUs
Detached New Builds
Garage Conversions
Basement Conversions
Detached ADUs
Transform your Portland property with a custom-built detached ADU. Whether you’re creating rental income, housing family, or adding flexible space, we design freestanding structures that maximize every square foot.
Garage ADU
Convert your underutilized garage into valuable living space. We handle structural upgrades, insulation, utilities, and interior finishing while maintaining exterior character. Perfect for properties where a detached ADU isn’t feasible.
Basement ADU
Unlock the potential beneath your home with a basement ADU conversion. Our team transforms basements into bright, comfortable living spaces that meet all city requirements. From waterproofing to egress windows, we ensure your basement ADU is safe, dry, and inviting. Ideal for creating rental income without changing your home’s footprint.
If you have questions about building an ADU, reach out to our design team to learn more. We’ll provide answers to some of the most frequently asked questions:
- What permits are required?
- How long does construction take?
- How much will my ADU cost?
View All Lamont Bros. ADUs
The Lamont Bros. Difference
Your superintendent has one focus – your project is their priority.
We finish jobs within 2 days of the projected completion date. Seriously.
We pride ourselves on providing accurate budgets without surprises, routinely completing projects within 5% of budget.
Here’s What the Process Looks Like:
Our Design Team Crates a Space to Meet Your Needs
Our Build Team Brings That Design to Life
You Enjoy Your New ADU
Ready to Get Started?
Step 1
Schedule a call with a Design Consultant
Step 2
Invite us to your home for an initial evaluation
Step 3
Align on budget and meet to discuss the design