We convert existing garages into ADUs with detailed checks for structure, utility scope, and permit requirements. This service is focused on realistic conversion planning before construction starts.
“Thomas and his team completely transformed our home. The craftsmanship is exceptional.”
Free consultation & estimate
Our Garage Conversion Approach
Not every garage is a candidate for conversion. Slab condition, ceiling height, structural framing, and utility access all determine whether a conversion is practical or whether a different ADU path makes more sense.
We assess your existing structure against Portland code requirements and give you a straight answer on scope, cost drivers, and permit needs before any commitment.
We confirm whether conversion is practical based on structure, access, and code requirements.
Mechanical, electrical, plumbing, and structural scope are aligned with permit needs before build.
Construction proceeds in inspection-ready phases with final turnover once approvals are complete.
Portland Garage ADU Conversions
N Portland
Garage relocation with new foundation as part of lot subdivision. Structural and site work coordinated through permit closeout.
N Portland
Interior renovation and site development with multi-trade coordination and permit management.
Garage Structure
New garage structure with foundation, framing, and site grading completed to code.
Our Guarantee
We stand behind our work. Every H&C project includes a written one-year workmanship warranty backed by our Oregon contractor bond and insurance.
Every joint, cut, and connection we make is backed for 12 months from substantial completion. If our work fails, we fix it at no cost to you.
You receive a signed warranty document at closeout. No verbal promises. No fine-print surprises. The scope is clear before you sign off.
Report a defect in writing or by email within 30 days of discovery. We schedule an inspection, confirm the issue, and handle the repair.
Project Financing
H&C Design-Build now offers financing options through U.S. Bank Avvance. If you are evaluating a remodel, you can review pre-approval options before final scope decisions are locked.
Financing is offered through U.S. Bank
Common Questions
No. Slab condition, ceiling height (minimum 7 feet finished), structural framing capacity, and utility access all determine whether conversion is practical or cost-effective.
Most conversions need structural, electrical, plumbing, HVAC, insulation, and finish work. The garage must meet habitable-space standards for ventilation, egress, and fire separation.
Portland garage conversions typically range from $80,000 to $180,000 depending on structural needs, utility capacity, and finish level. Foundation and ceiling height issues increase costs significantly.
Portland removed off-street parking requirements for ADUs in most residential zones. Check your specific zone overlay for any remaining requirements.
Permitting runs 2 to 5 months. Construction typically takes 3 to 6 months depending on structural scope. Total timeline is 6 to 10 months from feasibility to occupancy.
From Our Crew
Portland remodeling is what we do every day. These guides cover the real decisions homeowners face: permits, costs, materials, and trade coordination.
All guides
Portland garage to ADU conversion guide. 2026 zoning regulations, permit requirements, realistic costs, and what contractors check first.
Read guide
Portland permit requirements explained by a contractor. What work needs a permit, what is exempt, and why skipping permits costs more long-term.
Read guide