Home Addition Contractor in St. Louis, MO | Atlas General Contracting
Seamless Home Additions That Look Like They've Always Been There
Adding square footage to your existing home is almost always a better financial decision than selling and buying a bigger one in today's St. Louis market. Atlas General Contracting has been designing and building home additions across Missouri for 45+ years.
Professional Additions Services in the St. Louis Metro
Our additions are engineered to match your existing home's roofline, siding, trim, and interior finishes so seamlessly that most guests can't tell what's original and what's new. This is harder than it sounds — it requires architectural drawings, proper footings that tie into the existing foundation, and careful material sourcing for hard-to-match items like older brick and aluminum trim profiles.
Common addition projects we build across St. Louis include primary suite additions, family room bump-outs, kitchen extensions, second-story additions on ranch homes, attached garages, and four-season sunrooms. Each project includes structural engineering, city permits, HOA approvals where applicable, and full build-out.
Expect 3-6 months from design signoff to completed punch list on most additions. We coordinate all trades, hold weekly on-site meetings with homeowners, and stage work to minimize disruption to your day-to-day life.
What's Included With Our Additions Services
Every additions project is backed by 45+ years of local craftsmanship and a family-owned reputation we can't afford to lose.
Architectural Design Included
Drawings, engineering, and permits handled in-house so matching your existing home is guaranteed.
Second-Story Additions
We pop tops on St. Louis ranches to double living space — a high-ROI alternative to moving.
Master Suite & Bump-Outs
Primary bedroom, bath, and closet additions that transform how your family uses your home.
Four-Season Sunrooms
Insulated, HVAC-conditioned additions that function year-round, not just in spring and fall.
Additions Service Areas Across the St. Louis Metro
We serve homeowners and businesses across the entire St. Louis metropolitan area. Click your city for local project examples and neighborhood-specific details.
Additions FAQs for St. Louis Homeowners
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Explore Other Construction Services
We're a full-service general contractor. Bundling projects often saves money and simplifies scheduling.
Ready to Start Your Additions Project?
Free in-home estimates. Written proposals. No obligation. Talk to a third-generation St. Louis contractor who actually answers the phone.