Home Addition Contractor
in Indianapolis, IN.
We build home additions in Indianapolis, IN — room additions, second stories, in-law suites, and bump-outs that fit the home you already have. Indianapolis is the heart of Central Indiana — and home to some of the most ambitious custom-build and renovation projects in the state. We work in historic neighborhoods like Meridian-Kessler and Broad Ripple, and on new builds in Geist and Eagle Creek. Most additions in Marion County involve careful work with existing structure, foundations, and rooflines, and that's where the difference between a good builder and a careful one shows up.
A builder who knows Indianapolis.
Form Building Company is based at 2947 N Oakwood Ave in Muncie, IN — about an hour from Muncie via I-69. We've worked across Marion County for years and know the inspectors, the suppliers, and the neighborhoods.
- Neighborhoods we work in
- Meridian-Kessler · Broad Ripple · Geist · Eagle Creek · Northside · Old Northside
- Local landmarks
- Monon Trail · White River · Mass Ave · Geist Reservoir
- County
- Marion County, IN
- From our shop
- about an hour from Muncie via I-69
How we approach home additions in Indianapolis.
Every home additions project we run in Indianapolis follows the same proven process — from the first site visit to the final walk-through.
- 01
Room additions
Family rooms, primary suites, and home offices that match the original home in scale, finish, and feel.
- 02
Second-story additions
Doubling your footprint without losing your yard. We engineer the load path and protect what's below.
- 03
In-law / accessory suites
Private suites for parents, adult children, or guests — code-compliant and designed for long-term use.
- 04
Bump-outs & dormers
Smaller-scale additions that solve a specific problem (a bigger kitchen, a real mudroom) without overhauling the home.
- 05
Garage additions
Attached and detached garages, sometimes with finished space above. Sized and finished to match the home.
- 06
Permits & engineering
We handle the structural engineer, permits, and inspections — and we work clean so the existing home stays livable through the build.
Everything we do in Indianapolis.
Form Building Company is a full-scope builder in Indianapolis — from the first plan on a custom new home to the final tile in a primary suite remodel.
Custom Home Builders in Indianapolis
We design and build custom new homes for families across Central Indiana. Every plan is laid out for the way you actually live — and finished with the precision and quality you'd expect from a builder who treats every project like it's their own.
New Homes in Indianapolis 02Home Remodeling in Indianapolis
Kitchens, bathrooms, and whole-home renovations done with true craftsmanship. We protect the parts you love and rebuild the parts that aren't working — cleanly, on schedule, and with honest expectations.
Remodels in Indianapolis 03Kitchen Remodeling in Indianapolis
The kitchen is the room every project hinges on — and the room where the difference between a good builder and a careful one is most obvious. We design, demo, and rebuild kitchens from the studs up.
Kitchens in Indianapolis 04Bathroom Remodeling in Indianapolis
Bathrooms get the heaviest daily wear in the house — and the smallest tolerances. We rebuild bathrooms from the slab and waterproofing up, with finish work that holds up to twenty years of real use.
Bathrooms in IndianapolisHome Additions in Indianapolis — FAQs.
How much does a home addition cost in Indianapolis, IN?
Most home additions in Indianapolis and Marion County fall between $200–$400 per square foot, depending on whether you're adding to the foundation, going up a story, or extending mechanicals. We give you a detailed estimate after a site visit so the number reflects your actual home — not an industry average.
Can we live in the home during the addition?
In most cases, yes. We zone the work, dust-protect the existing home, and sequence the cut-ins to keep things livable. For larger jobs (whole-floor additions, kitchen + addition combos), we'll talk through whether a short-term move makes sense.
How long does a typical addition take?
Smaller additions (300–500 sq ft) usually run 3–5 months once permits are in. Second-story or whole-wing additions are typically 6–9 months. Design and engineering can add 2–4 months on the front end depending on scope.
Do you handle the architect and engineering?
Yes. We work with trusted architects and structural engineers across Central Indiana, or we'll work alongside yours. For most additions we recommend involving us early so the budget and structural approach line up before drawings get expensive to change.
Home Additions in other Central Indiana cities.
We build home additions across all of Central Indiana — explore the closest neighboring areas to Indianapolis.
- Home Additions in CarmelHamilton County, IN
- Home Additions in FishersHamilton County, IN
- Home Additions in NoblesvilleHamilton County, IN
- Home Additions in WestfieldHamilton County, IN
- Home Additions in ZionsvilleBoone County, IN
- Home Additions in MuncieDelaware County, IN
- Home Additions in MarionGrant County, IN
- Home Additions in AndersonMadison County, IN
Start your Indianapolis home additions project.
Tell us about your home in Indianapolis — what you're picturing, the timeline you're working with, and the way you live. We'll be in touch personally, usually within 48 hours.