Updated June 2026 · Awesome Additions · Sample editorial content
Typical 2026 ranges for a Prosper home addition. Your real number depends on size, finishes, and site conditions.
- Room additions — about $80k–$200k. Room additions in Prosper →
- Second-story additions — about $150k–$300k. Second-story additions in Prosper →
- Garage conversions — about $60k–$150k. Garage conversions in Prosper →
- ADUs & in-law suites — about $120k–$250k. ADUs & in-law suites in Prosper →
- Primary suite expansions — about $80k–$180k. Primary suite expansions in Prosper →
- Guest & pool houses — about $90k–$250k. Guest & pool houses in Prosper →
What drives the number in Prosper
Square footage and complexity, plumbing, roof and exterior tie-ins, finish level, and site access. We walk the home, prepare a feasibility report, and give you a real estimate — the number in the contract is the number you pay.
See the metro-wide DFW cost guide for more.
Ready to talk specifics?
We design and build additions in Prosper.Browse our Prosper services or tell us what you're trying to add.
Prosper Services →