Home Addition cost guide.
Home addition cost varies significantly by type — a small bump-out costs far less than a full second-story addition.
By submitting, you agree to be contacted by phone, text, or email about your project, including by automated means, even if your number is on a do-not-call list. Consent is not a condition of purchase. See our Privacy Policy and TCPA Compliance page for details.
Assigners CommitmentYour request is only shared with a service provider matched to your project and service area — never sold as part of a bulk or resold list.
Key cost factors.
- Addition type (bump-out vs. full addition vs. second story)
- Foundation work required
- Whether plumbing/HVAC is being extended
- Local permit and zoning requirements
Before you hire or buy.
- Does this quote include foundation work and permits?
- How is this addition tied into existing HVAC and electrical systems?
- What's a realistic timeline given permitting in my area?
Home Addition questions, answered.
Is it cheaper to build up or out?
This depends on your lot, existing foundation, and local costs — a second-story addition avoids new foundation costs but adds structural complexity, while a ground-level addition requires new foundation work but can be simpler overall. A contractor can assess which makes sense for your specific home.
Figures on this page are illustrative examples for general education, not quotes or guarantees of actual pricing. Actual costs vary by provider, location, and specific project scope — always get a specific quote before making a purchasing decision.
Selling in home services?
Talk to our sales team about sourcing exclusive, real-time leads, warm transfers, and inbound calls.