Additions and Remodels Cost in Saint Louis, MO in 2026
Most Additions and Remodels projects in Saint Louis, MO cost between $53,000 and $245,000. The typical price is $115,000.
Labour and materials in Saint Louis run about 4% above the national average. These figures are adjusted for that, so they are not the national average you will find elsewhere.
What drives the price
- Whether the addition needs its own foundation and roof tie-in
- Adding a bathroom or kitchen (plumbing and electrical runs)
- Structural work to the existing wall being opened up
- Local permit and inspection requirements
Usually included
- Framing, roofing and siding to match
- Electrical rough-in and finish
- Insulation, drywall and paint
- Flooring and trim
Usually extra
- Permits and architectural drawings
- Site work or tree removal
- High-end fixtures and appliances
Unit prices in Saint Louis, MO
| Quality tier | Cost per sq ft |
|---|---|
| Budget | $135 |
| Mid-range | $285 |
| High-end | $615 |
Home addition and remodeling contractors in Saint Louis, MO
Businesses listed on Google near Saint Louis, MO. We are not affiliated with them and do not vet them — always confirm licensing and insurance before hiring.
More For Less Remodeling
4.9(225 reviews)
9917 Gravois Rd, St. Louis, MO 63123
Mosby Building Arts
4.7(190 reviews)
645 Leffingwell Ave, St. Louis, MO 63122
Agape Construction
4.4(91 reviews)
435 E Clinton Pl, St. Louis, MO 63122
Shipley's Helping Hand General Contracting and Landscape
5.0(52 reviews)
7807 Guhman Ct, Hazelwood, MO 63042
Hamtil Construction LLC
4.9(54 reviews)
11155 S Towne Square Ste E, St. Louis, MO 63123
Rosette Forever Homes
5.0(47 reviews)
3121 Arsenal St, St. Louis, MO 63118