Room Addition Cost Calculator
Estimate square-foot addition costs for bedroom suites, family rooms, home offices, and more before design and permit work begins.
Built around Simpsonville, Fountain Inn, Greenville County, and Laurens County installed pricing, overhead, and contractor markup.
Budget Planning Disclaimer
This calculator is for planning only. Final pricing varies based on existing conditions, structural work, framing changes, plumbing or electrical upgrades, finish selections, permit requirements, and actual scope. We recommend using this as a starting range, then scheduling a site visit for a written estimate.
Choose Your Project
Estimate Snapshot
Selected project
Small Single-Room Addition
Foundation, framing, roofing tie-in, electrical, insulation, drywall, and standard interior finishes.
Finish level
Labor estimate$29,348
Materials allowance$34,452
Recommended contingency$7,656
Projected investment$63,800
Planning range: $52,800 to $74,800. Final pricing will depend on site conditions, selected products, and scope confirmation.