Home Addition Cost in Phoenix, AZ
Estimate your home addition budget in Phoenix with local cost data. Average costs range from $93 to $372/sq ft.
Budget
$93
per sq ft
AVERAGE
Mid-Range
$186
per sq ft
High-End
$372
per sq ft
Home Addition Budget Calculator — Phoenix
100 sq ft800 sq ft
0% (none)25% (generous)
Estimated Total for Phoenix, AZ
$92,070
450 sq ft × $186/sq ft$83,700
Contingency (10%)$8,370
Total Estimate$92,070
* Estimates are based on 2026 average costs for Phoenix, AZ. Actual costs may vary based on specific project requirements, contractor pricing, material selections, and permit fees.
About Home Addition in Phoenix
Building new living space including foundation, framing, roofing, and all interior finishes.
Typical Duration
12–24 weeks
Cost Range (Phoenix)
$93 – $372/sq ft
Frequently Asked Questions: Home Addition in Phoenix
How much does a home addition cost?
Home additions cost $100–$400 per square foot depending on the type. A 400 sq ft addition ranges from $40,000 to $160,000.
How long does it take to build a home addition?
Most home additions take 3 to 6 months. Larger additions or those requiring significant foundation work may take longer.
What type of home addition adds the most value?
Adding a primary bedroom suite or a family room with a bathroom provides the highest ROI, typically recovering 50-65% of costs.
Do I need an architect for a home addition?
For most additions, yes. An architect ensures structural integrity, code compliance, and design cohesion with your existing home.
How do I track addition project costs?
Home additions involve many contractors and change orders. Use BuildLedger to maintain a clear financial ledger showing every invoice, payment, and change throughout the project.
Track Your Home Addition Budget
BuildLedger helps you manage contractor invoices, track payments, and keep your remodel on budget — all in one place.