Number 1: Dana King
on GoogleSt. Louis, MO
Dana King works as a home addition contractor in St. Louis, Missouri.
(314) 914-2840 10405 Baur Blvd Ste H, St. Louis, MO 63132
Home addition contractors in St. Louis
The 10 home addition contractors from Google's results for St. Louis, Missouri, ordered by Google rating weighted by review count. No firm pays to be listed or ranked.
Last updated
- Bump-out
- $25,500 – $61,000small single-room extension
- Room addition
- $81,500 – $204,000ground floor, finished
- Second-story addition
- $153,000 – $408,000whole or partial floor
- St. Louis vs US
- +2%around the US median
Licensing in Missouri. Missouri has no statewide license for general contractors. Kansas City and St. Louis license contractors locally.
Number 2: Exterior Remodeling Contractors in St. Louis
on GoogleCollinsville, IL
Butler Home Improvement works from Collinsville, IL, and remodels kitchens for Lake St. Louis, MO, homeowners and surrounding communities. The company also does kitchen design, interior and exterior renovations, home additions and work on commercial properties.
(618) 344-7073 906 Vandalia St, Collinsville, IL 62234
Number 3: Liston Design Build
on GoogleSt Charles, MO
Liston Design Build remodels bathrooms for homes in St. Louis, St. Charles and nearby areas, starting with design and carrying the job through the last details. Work can include relocating plumbing and choosing fixtures, and the company also builds home additions from its St. Charles, Missouri, base.
(636) 940-9417 1106 1st Capitol Dr, St Charles, MO 63301
Number 4: Rea Homes LLC
on GoogleCreve Coeur, MO
Working out of Creve Coeur, REA Homes builds custom houses across the St. Louis area, with a focus on high-performance construction aimed at function and comfort. Its trade work in the region also includes home additions.
(314) 400-2119 14 Sherwyn Ln, Creve Coeur, MO 63141
Number 5: St. Louis Room Additions
on GoogleBarnhart, MO
Bax-Built Construction builds room additions and handles custom remodeling, from basement updates to new wings added onto St. Louis area houses. The Barnhart company pitches additions as a way for growing families, or relatives moving in, to gain living space without buying a bigger home.
(314) 623-3102 1901 Parkton Way, Barnhart, MO 63012
Number 6: Lake Side Renovation and Design
on GoogleChesterfield, MO
Lake Side Renovation and Design builds home additions in Chesterfield, Missouri.
(636) 978-5000 139 Chesterfield Industrial Blvd, Chesterfield, MO 63005
Number 7: Room Addition Designers & Contractors
on GoogleSt. Louis, MO
Mosby Building Arts runs every stage of a St. Louis remodel through one design-build team that includes its own designers and architects. Projects include kitchens, baths, basements, home additions and whole-home remodels, along with living-in-place updates that help owners stay in their homes as they age.
(314) 909-1800 645 Leffingwell Ave, St. Louis, MO 63122
Number 8: Agape Construction
on GoogleKirkwood, MO
Agape Construction remodels homes and builds room additions in St. Louis from its location in Kirkwood, Missouri. Its own team of architects, interior designers and builders works through each project with the homeowner, letting families stay in their neighborhood while reshaping the house, bathrooms included.
(314) 909-9050 435 E Clinton Pl, Kirkwood, MO 63122
Number 9: HuxCo Construction
on GoogleCrystal City, MO
HuxCo Construction, based in Crystal City, builds home additions and installs siding for homeowners in St. Louis and across Missouri. Its project list also covers kitchen and bathroom remodels, wall removal, decks, fences, retaining walls, hail damage and roof repair, and window, door and cabinet installation.
(636) 931-2243 102 N Truman Blvd, Crystal City, MO 63019
Number 10: Home Additions Contractor Clayton, MO
St. Louis
From its Clayton base, ST Evans, Inc. builds home additions for houses around St. Louis. Past projects include a two-story addition and a covered backyard porch paired with remodeling work on the rest of the home.
What home addition contractors charge in St. Louis
In St. Louis, a bump-out typically costs $25,500 – $61,000. Remodeling labor in St. Louis runs about 2% above the US median, which accounts for most of the difference from the same project elsewhere.
How to choose between them
- Check the license yourself. Where Missouri or St. Louis licenses this work, the licensing board's own lookup confirms a license number in a minute. Do it before you sign, not after.
- Get three bids on the same scope. Written down, split into labor, materials, allowances and anything structural. Most people compare a total against a total and end up choosing between two different projects.
- Ask what is not included. Permits, debris removal, fixture and finish allowances, and repairs after demolition are the four that turn a cheap bid into an average one.
- Never pay a large deposit up front. A deposit to order materials and hold a start date is normal. Half the total before anyone shows up is not.
How this list is ordered
These are the firms from Google's results for "home additions st. louis", with directories, chains and suppliers removed. They are ordered by Google rating weighted by review count, and the ratings shown are Google's. No firm pays to be listed or ranked. The list was last updated in October 2026.
Home addition contractors in St. Louis: common questions
Do I need an architect for a home addition?
Usually yes, or a design-build firm with in-house design. Additions need stamped structural drawings for the permit in most places, and zoning review on setbacks, height and lot coverage.