Design-build home additions with One True Price — your exact price fixed before construction begins.
Book a Free ConsultationMost home additions by Lux Builders run $150,000–$500,000+, depending on square footage, foundation type, and what the new space contains — a primary suite with bath costs more per foot than a family room. One True Price fixes the full number before we break ground.
| Factor | Lower end | Upper end |
|---|---|---|
| Size & stories | Single-story bump-out | Two-story addition |
| What's inside | Family room, sunroom | Primary suite with bath, kitchen expansion |
| Foundation | Crawl space | Full basement under the addition |
| Tie-in complexity | Simple roofline | Complex roof and structural tie-ins |
| Exterior match | Standard siding match | Brick, stone, custom trim matching |
An addition is the answer when the location is right and the square footage isn't. It is also the project where allowance-based bids go wrong most expensively — structural surprises, roof tie-ins, and matching finishes. Our design-first process engineers those risks out before pricing, which is why our price holds.
Four stages. One fixed price before construction begins. No allowances, no surprises.
We start with design, not a rough guess. A modest design fee gets you a real plan built around your home and budget.
Complete construction plans and every selection — cabinetry, tile, fixtures, hardware — chosen and priced before we build.
One fixed price before construction begins. No allowances, no change-order roulette, no surprise costs.
Hands-on construction management to the agreed plan and price, with a schedule you can hold us to.
Two-story addition: primary suite above, expanded family room below.
Pushed the back wall out 12 feet to create an eat-in kitchen and true mudroom.
Most home additions by Lux Builders run $150,000–$500,000+ depending on size, foundation, and what the space contains. The full price is fixed with One True Price before construction begins.
Design, engineering, and permitting typically take 10–16 weeks, and construction typically takes 12–20 weeks depending on scope and season.
Yes. Structural engineering, permits, and inspections across Livingston County and surrounding communities are managed by our team as part of every addition.
Matching rooflines, siding, brick, and trim is engineered during the design stage — you will see exactly how the addition ties in before you approve the price.
We are based in Brighton, Michigan and serve Livingston County and Southeast Michigan, including Howell, Ann Arbor, Novi, South Lyon, and Milford.
Start with a free design consultation. We'll talk about your home, your goals, and what your investment really looks like — before you commit to anything.
Book a Free Consultationor call (810) 222-1016