Home Addition Cost by City (2026)

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Room addition including foundation, framing, roofing, and finish work. Pricing varies meaningfully by city — coastal metros run 30-60% above the national average while affordable Sun Belt and Midwest markets run 5-20% below.

National avg
$55,000
Budget
$20,000
High-end
$120,000
43 cities covered
Room addition framing in progress with open walls and roof sheathing
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Cost breakdown — national average home addition

Framing & structure
25%
$13,800
Foundation
15%
$8,300
Roofing
10%
$5,500
Electrical
10%
$5,500
Plumbing
$4,400
Drywall & finish
12%
$6,600
Windows & doors
$4,400
HVAC extension
$3,900
Permits & design
$2,800

Most and least expensive cities

Least expensive

  1. 1.Augusta, GA$45,100
  2. 2.El Paso, TX$45,100
  3. 3.Rochester, NY$48,400
  4. 4.Tucson, AZ$48,400
  5. 5.Columbus, OH$49,000

All 43 cities

New York

Room addition framing in progress with open walls and roof sheathing
New York, NY
Avg: $82,000 · $26,800–$205,600
Room addition framing in progress with open walls and roof sheathing
Brooklyn, NY
Avg: $78,100 · $25,600–$196,000
Room addition framing in progress with open walls and roof sheathing
Buffalo, NY
Avg: $50,600 · $16,600–$127,000
Room addition framing in progress with open walls and roof sheathing
Rochester, NY
Avg: $48,400 · $15,800–$121,400

California

Room addition framing in progress with open walls and roof sheathing
Los Angeles, CA
Avg: $75,400 · $24,700–$189,100
Room addition framing in progress with open walls and roof sheathing
San Diego, CA
Avg: $70,400 · $23,000–$176,600
Room addition framing in progress with open walls and roof sheathing
San Jose, CA
Avg: $83,600 · $27,400–$209,800
Room addition framing in progress with open walls and roof sheathing
San Francisco, CA
Avg: $86,900 · $28,400–$218,000
Room addition framing in progress with open walls and roof sheathing
Sacramento, CA
Avg: $64,900 · $21,200–$162,800

Illinois

Room addition framing in progress with open walls and roof sheathing
Chicago, IL
Avg: $65,400 · $21,400–$164,200
Room addition framing in progress with open walls and roof sheathing
Aurora, IL
Avg: $59,400 · $19,400–$149,000
Room addition framing in progress with open walls and roof sheathing
Naperville, IL
Avg: $67,100 · $22,000–$168,400

Texas

Room addition framing in progress with open walls and roof sheathing
Houston, TX
Avg: $53,400 · $17,500–$133,900
Room addition framing in progress with open walls and roof sheathing
San Antonio, TX
Avg: $49,500 · $16,200–$124,200
Room addition framing in progress with open walls and roof sheathing
Dallas, TX
Avg: $55,600 · $18,200–$139,400
Room addition framing in progress with open walls and roof sheathing
Austin, TX
Avg: $60,000 · $19,600–$150,400
Room addition framing in progress with open walls and roof sheathing
Fort Worth, TX
Avg: $53,900 · $17,600–$135,200
Room addition framing in progress with open walls and roof sheathing
El Paso, TX
Avg: $45,100 · $14,800–$113,200

Arizona

Room addition framing in progress with open walls and roof sheathing
Phoenix, AZ
Avg: $52,200 · $17,100–$131,100
Room addition framing in progress with open walls and roof sheathing
Tucson, AZ
Avg: $48,400 · $15,800–$121,400
Room addition framing in progress with open walls and roof sheathing
Scottsdale, AZ
Avg: $61,600 · $20,200–$154,600

Pennsylvania

Room addition framing in progress with open walls and roof sheathing
Philadelphia, PA
Avg: $62,700 · $20,500–$157,300

Florida

Room addition framing in progress with open walls and roof sheathing
Jacksonville, FL
Avg: $52,200 · $17,100–$131,100
Room addition framing in progress with open walls and roof sheathing
Miami, FL
Avg: $61,600 · $20,200–$154,600
Room addition framing in progress with open walls and roof sheathing
Tampa, FL
Avg: $57,800 · $18,900–$144,900
Room addition framing in progress with open walls and roof sheathing
Orlando, FL
Avg: $56,100 · $18,400–$140,800
Room addition framing in progress with open walls and roof sheathing
Fort Lauderdale, FL
Avg: $63,200 · $20,700–$158,700

Ohio

Room addition framing in progress with open walls and roof sheathing
Columbus, OH
Avg: $49,000 · $16,000–$122,800

North Carolina

Room addition framing in progress with open walls and roof sheathing
Charlotte, NC
Avg: $51,200 · $16,700–$128,300

Washington

Room addition framing in progress with open walls and roof sheathing
Seattle, WA
Avg: $67,100 · $22,000–$168,400

Colorado

Room addition framing in progress with open walls and roof sheathing
Denver, CO
Avg: $59,400 · $19,400–$149,000
Room addition framing in progress with open walls and roof sheathing
Colorado Springs, CO
Avg: $55,000 · $18,000–$138,000
Room addition framing in progress with open walls and roof sheathing
Aurora, CO
Avg: $57,200 · $18,700–$143,500

Massachusetts

Room addition framing in progress with open walls and roof sheathing
Boston, MA
Avg: $74,200 · $24,300–$186,300

Tennessee

Room addition framing in progress with open walls and roof sheathing
Nashville, TN
Avg: $52,800 · $17,300–$132,500

Oregon

Room addition framing in progress with open walls and roof sheathing
Portland, OR
Avg: $63,200 · $20,700–$158,700

Michigan

Room addition framing in progress with open walls and roof sheathing
Detroit, MI
Avg: $50,000 · $16,400–$125,600

Georgia

Room addition framing in progress with open walls and roof sheathing
Atlanta, GA
Avg: $53,900 · $17,600–$135,200
Room addition framing in progress with open walls and roof sheathing
Augusta, GA
Avg: $45,100 · $14,800–$113,200
Room addition framing in progress with open walls and roof sheathing
Savannah, GA
Avg: $49,500 · $16,200–$124,200
Room addition framing in progress with open walls and roof sheathing
Marietta, GA
Avg: $56,100 · $18,400–$140,800

Minnesota

Room addition framing in progress with open walls and roof sheathing
Minneapolis, MN
Avg: $57,800 · $18,900–$144,900

Virginia

Room addition framing in progress with open walls and roof sheathing
Richmond, VA
Avg: $51,700 · $16,900–$129,700

Frequently asked questions

A home addition averages $55,000 nationally in 2026 for a typical 400 sq ft single-room addition. Master suite additions (500-700 sq ft) run $75,000-$110,000; second-story additions reach $90,000-$160,000; two-story additions $120,000-$250,000+. Per-square-foot $150-$400 installed.