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Four-season sunrooms — insulated, HVAC-ready, permitted, and built as a true year-round living space.
Sunroom additions in Sunnyvale provide climate-controlled year-round outdoor living space — a functional upgrade for families who want more usable square footage without the full cost of a traditional room addition. Three-season and four-season (fully insulated, HVAC-connected) sunroom configurations are both active scopes here. We design and build sunroom additions throughout Sunnyvale with Town of Sunnyvale permit handling, foundation work suited to clay soil, and all framing through finish under one contract. Call (469) 721-0146. Response within 1 business day.
From $28,000 · Finance from $467/mo · Response Within 1 Business Day
Scope of Work
Why i30 Builders
Sunnyvale projects often span wider property footprints than typical suburban lots — longer fence runs, more hardscape square footage, and outdoor structures sized to take advantage of the extra yard. We scope accordingly and don't size projects to a cookie-cutter suburban template.
How It Works
Design & Plan
We assess your existing slab or design a new foundation, discuss window systems and HVAC requirements before quoting.
Permit & Structural
Sunrooms are additions that require building permits and structural review. We manage all submissions and engineering coordination.
Build
Foundation, framing, windows, insulation, HVAC rough-in, and interior finishes installed by our in-house team.
CO & Walk
We coordinate Certificate of Occupancy for the addition and walk the finished room with you before sign-off.
Sunrooms FAQs for Sunnyvale
A three-season sunroom in Sunnyvale (screened and glazed, not HVAC-connected) runs $28,000–$55,000 depending on size and finish. A four-season sunroom with full insulation, HVAC extension, and finished interior runs $45,000–$90,000+ depending on size. We provide a detailed scope-based estimate after an in-home walkthrough.
Yes — sunroom additions are classified as structural home additions and require a building permit from the Town of Sunnyvale along with sealed structural and energy-compliance drawings. HVAC extensions require mechanical permits. We handle all permit documentation and coordination as part of every sunroom project.
Four-season sunroom additions are designed to connect to the existing HVAC system or receive a dedicated mini-split unit. The approach depends on the existing system's capacity and your preferred heating and cooling configuration. We coordinate with a licensed HVAC contractor to evaluate the best option for your specific home as part of the sunroom design.
Client Experience
“We have a covered concrete slab off the back of our house that we never used because the mosquitoes out here are absolutely brutal from May through October. i30 Builders converted it to a screened porch in about a week and a half. I asked specifically about pet-resistant screens because our lab destroys everything, and they knew exactly what I was talking about — showed me the 20x20 mesh rating. My husband was skeptical about the cost but now he's out there every evening. Worth every penny.”
Kayla Stutts
Caddo Mills, TX · Screened Porch Conversion
More in Sunnyvale
Sunrooms in Nearby Cities
See the full sunrooms overview — materials, pricing, and what to expect.
Sunrooms OverviewShare your scope and timeline. We serve Sunnyvale with in-house trades and clear delivery — we respond within one business day.