Home Addition Cost Calculator
Room additions in Upstate SC typically cost $200–$340 per square foot depending on finishes, HVAC, plumbing, and structural complexity — a 400 sqft addition typically runs $78,000–$152,000. Use this calculator for a realistic planning range.
Competitive local pricing for Simpsonville, Fountain Inn, Gray Court & Greenville County — transparent 20% overhead & profit.
Planning more than one project? Try our all-in-one Project Cost Calculator.
- BBB Rating
- A+
- Google Rating
- 5.0
- Experience
- 35+
- Licensed
- 100%
How much does a room addition cost in Upstate SC?
Room additions in Upstate SC typically cost $200–$340 per square foot depending on finishes, HVAC, plumbing, and structural complexity — a 400 sqft addition typically runs $78,000–$152,000. Use this calculator for a realistic planning range.
| Tier | Price Range | Typical at 400 sq ft | What's Included |
|---|---|---|---|
| Basic Finish Addition | $196-236/sq ft | $78,316–$94,317 | Standard finishes, functional layout, code-compliant |
| Standard Living Space Addition | $248-299/sq ft | $99,262–$119,541 | Quality finishes, HVAC, updated fixtures, good flow |
| Premium Custom Addition | $316-381/sq ft | $126,581–$152,442 | High-end finishes, custom features, premium materials |
| Luxury Master Suite (300+ SF) | $353-425/sq ft | $141,152–$169,989 | Luxury master bedroom, spa bath, custom closet, premium everything |
How We Price This
These ranges are computed from Burch Contracting's own pricing formula (base cost per square foot, adjusted for material, complexity, and site conditions, plus a fixed 20% overhead & profit — see services.html for the full comparison). The real-world data source behind the base rates themselves is not yet published. Updated by C. Scott Burch.
How long does a room addition take to build?
Most room additions take 8 to 16 weeks. A single-story bedroom addition is at the shorter end, while a master suite with a full bath or a two-story addition requiring structural engineering takes longer. We give you a project-specific schedule before work begins.
Can you match a new addition to my existing home?
Yes. Matching the roofline, siding, trim, and interior finishes so the addition blends seamlessly with your existing home is a core part of how we work. With 35+ years building in the Upstate, we source materials to match older homes as closely as possible.
What types of additions do you build?
We build bedroom additions, master suites with bathrooms and walk-in closets, sunrooms, in-law suites, and two-story additions. Many of our addition clients are creating space for multi-generational living or building out a forever home rather than moving.