St. Louis Metro Area's Trusted Sunroom and Porch Enclosure Contractor

• 3-Season Rooms: A 3-season room uses Sunspace WeatherMaster vinyl windows and is designed for use from spring through fall. It blocks wind, bugs, and rain while providing excellent ventilation through panels that open to seventy-five percent.
• 4-Season Rooms: A 4-season room is fully enclosed with thermal core walls, insulated glass, and a structural aluminum frame system designed to support year-round heating and cooling. It functions as a true conditioned living space and connects to your home's existing HVAC. This option requires a more substantial foundation and a higher investment, but delivers comfort in every Missouri season.

Foundation requirements vary depending on your existing structure, lot conditions, and the type of room being built. Common foundation options for St. Louis Metro Area homes include:

• Existing concrete slabs, if structurally sound and in good condition
• New concrete slab with frost footings
• Helical piers with an insulated floor system are ideal for elevated decks or soft soil conditions
• Frost-protected footings were required by local code

During your consultation, we evaluate your current deck, patio, or porch to determine what meets Missouri building standards for your specific county and municipality.

Yes. A well-built sunroom adds significant value at the St. Louis Metro Area, where buyers seek bright, versatile indoor-outdoor spaces. A conditioned, code-compliant four-season room can significantly enhance both the resale appeal and usable living space.

Yes. Sunspace USA is fully licensed, insured, and bonded for residential construction in the state of Missouri. We comply with all applicable state and local requirements for structural installations, permit compliance, and residential contracting across the counties we serve.

Sunspace products installed by Sunspace USA come with manufacturer warranties covering windows, doors, vinyl panels, and structural components. We also stand behind our installation with a workmanship warranty, meaning both labor and materials are protected. All warranty terms and coverage details are reviewed with you before your build is approved, so you know exactly what is included and for how long.

If a concern arises after your project is complete, whether it is a fit, finish, or performance issue, contact us directly, and we will respond promptly. Our team handles all warranty claims, adjustments, and corrections in coordination with the Sunspace manufacturer. We do not pass the problem off to a third party or leave you to navigate the warranty process on your own. Your project has our name on it, and we stand behind it.

In most cases, yes. The majority of Missouri municipalities require a permit for any enclosed sunroom or porch addition, regardless of size or season rating. This typically includes a zoning review, a structural plan review, and, in some cases, an inspection at multiple stages of the build. Unpermitted work can create complications when you sell your home or file an insurance claim, so we always recommend building to code from the start.

We manage the entire permitting process on your behalf, including:

• Drawings and structural documentation
• Product engineering data and Sunspace specifications
• Zoning and building permit applications
• Scheduling and coordinating required inspections

We handle all direct communication with your local building department, so you do not have to. Processing times vary by county and municipality, typically ranging from two to six weeks, and we factor that timeline into your project schedule from the start.

Most projects involve two to four weeks of on-site construction once permits are approved and materials are delivered. The total timeline from your initial consultation to a finished space typically runs eight to fourteen weeks, depending on project complexity, permit processing time in your municipality, and seasonal scheduling. We give you a realistic timeline during the design phase and keep you informed at every stage so there are never any surprises.