Home additions in Bloomfield Hills & Metro Detroit.
Build out, build up, or convert what you have. Primary suite additions, sunrooms, garage conversions, second-story build-ups. We handle drawings, permits, structural engineering, and the build itself across Bloomfield Hills, Birmingham, Royal Oak, Troy, and the rest of Oakland County.
What we build
Build out (ground level)
- Foundation & framing
- HVAC, plumbing, electrical
- Roof tie-in
- Interior finishes
Build up (second story)
- Better for tight lots
- Structural reinforcement below
- New roof system
- Stair construction
Common scopes
- Primary suite additions
- Sunrooms
- Garage conversions
- Mudroom & pantry additions
What drives the cost
- Square footage
- Build out vs. up
- HVAC and electrical extension
- Older home conditions
Our process
Walkthrough & feasibility
- Free, on-site
- Zoning and setback check
- Build-out vs. build-up discussion
Design & permits
- Drawings & structural engineering
- Permits submitted
- Fixed-price written estimate
Build
- Foundation & framing
- Mechanical rough-ins
- Weekly updates
Walkthrough & warranty
- Punch list together
- Final inspection
- One-year workmanship warranty
Home addition questions.
How long does a home addition take?
A typical single-room addition runs 8 to 12 weeks once we break ground. A larger addition or second-story build-up runs 4 to 7 months. Foundation, framing, and weather all affect the schedule — we plan around Michigan winter when we can.
How much does a home addition cost in Michigan?
Most additions in Oakland County run $200 to $400 per square foot, so a 400 sq ft addition typically lands between $80,000 and $160,000. Sunrooms, primary-suite additions, and second-story build-ups go higher because of the mechanical and structural work.
Do I need a permit for an addition in Oakland County?
Yes — every Oakland County city requires permits for additions. We handle the drawings, the permit submittal, and inspections. Bloomfield Hills, Birmingham, and Bloomfield Township each have their own zoning and setback rules we navigate.
Build out or build up — which is better?
Depends on the lot. Building out is usually cheaper and simpler if you have the yard space and setbacks allow it. Building up makes more sense on tight lots or when the homeowner wants to preserve outdoor space, but it always requires structural reinforcement on the floor below.