Start Your Home Addition Planning with the ST Evans Addition Calculator

ST Evans, Inc. has been a trusted name in the St. Louis area since 1994, and now we’re making it even easier for homeowners to begin planning their next project with our Home Addition Calculator to help you share the specific details we need to provide an accurate, personalized quote for your home addition.

As a family‑owned company with more than five decades of combined experience, we understand that a home addition is a major investment in comfort, functionality, and long‑term value. Our Addition Calculator is designed to simplify the process by gathering the essential information our team needs to guide you from concept to construction with confidence.

Expertise You Can Trust

When you submit your project details through the Addition Calculator, you’re backed by a company known for craftsmanship, precision, and customer‑first service. As a Preferred Contractor for Owens Corning and an Expert Member of LP BuildSmart, we bring industry‑leading knowledge to every addition we design and build.

We’re fully licensed, bonded, and insured, giving you complete peace of mind throughout the planning and construction process. And because responsiveness matters, our team guarantees replies by the next business day.

Support from Start to Finish

Your submission through the Addition Calculator is the first step toward a tailored, professional consultation. We offer free estimates to help you make informed decisions, and every project is backed by our one‑year labor warranty—ensuring your investment is protected long after the work is complete.

Whether you’re envisioning a larger kitchen, an expanded living area, a new bedroom suite, or a full multi‑room addition, ST Evans is here to bring your ideas to life with quality, clarity, and care.