Room additions expand living space without moving. We design attached additions, in-law suites, and bonus rooms that match your roof lines, foundation, and interior architecture, with permits and structural scope handled professionally.
Home Additions in the Treasure Valley
Room additions expand living space without moving. We design attached additions, in-law suites, and bonus rooms that match your roof lines, foundation, and interior architecture, with permits and structural scope handled professionally.
Planning from$80k·Your exact range is confirmed at the free in-home visit
Why homeowners choose us
- Structural and architectural planning, before breaking ground
- Exterior materials matched to, your existing home
- Clear permit path for, Ada and Canyon County
- Integrated HVAC and electrical planning
What's included
- Feasibility and site evaluation
- Foundation and framing
- Roof tie-in and exterior finish
- Interior finish to match existing home
- Permit and inspection coordination
Our process,
step by step
Site visit
We review setbacks, access, and structural implications.
Design and engineering
Plans address code, loads, and aesthetic match.
Construction
Foundation through finish with weekly communication.
Inspections and closeout
We coordinate final inspections and walkthrough.
Typical timeline
Additions vary widely; many projects run 3 to 5 months from design through certificate of occupancy.
Room addition cost in the Treasure Valley
As of 2026, room additions in the Boise area commonly plan $80,000 to $250,000 or more. Single-room bump-outs sit at the lower end; primary suite additions with bathrooms and second-story additions with structural upgrades reach the upper end.
These are planning ranges, not bids. Foundation, roof tie-in, and whether plumbing is included drive addition budgets, which we confirm in a written scope after your free in-home visit.
Room Addition across the Treasure Valley
We provide room addition services throughout the Treasure Valley, with dedicated local pages for each city we serve. Permit paths, housing stock, and HOA requirements differ between Ada and Canyon County communities, so each city page covers the details that matter where you live.
Choose your city below to see local room addition guidance, or schedule a free in-home consultation to discuss your project directly.
Why design-build for your room addition
As a design-build remodeler, we bring design, estimating, permitting, and construction under one contract and one accountable team. That removes the handoffs and finger-pointing that happen when a separate designer and general contractor are involved - and it keeps your room addition on a single, coordinated schedule.
You get a written scope before construction begins, clear allowances for selections, proactive communication throughout the build, and a workmanship guarantee when the project is complete.
Frequently asked questions
Ready to begin?
Free 60 to 90 minute in-home visit. Planning guidance, design direction, no obligation.