Attic Conversion Cost by City (2026)

Attic conversion to living space including insulation, dormers, flooring, and electrical. 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
$40,000
Budget
$15,000
High-end
$90,000
43 cities covered
Attic conversion framing showing insulation and dormer window
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Cost breakdown — national average attic conversion

Framing & dormers
25%
$10,000
Insulation
12%
$4,800
Drywall & finish
12%
$4,800
Flooring
10%
$4,000
Electrical
12%
$4,800
Plumbing (if bath)
$3,200
Windows
$3,200
HVAC
$3,200
Permits & design
$2,000

Most and least expensive cities

Most expensive

  1. 1.San Francisco, CA$63,200
  2. 2.San Jose, CA$60,800
  3. 3.New York, NY$59,600
  4. 4.Brooklyn, NY$56,800
  5. 5.Los Angeles, CA$54,800

Least expensive

  1. 1.Augusta, GA$32,800
  2. 2.El Paso, TX$32,800
  3. 3.Rochester, NY$35,200
  4. 4.Tucson, AZ$35,200
  5. 5.Columbus, OH$35,600

All 43 cities

New York

Attic conversion framing showing insulation and dormer window
New York, NY
Avg: $59,600 · $20,100–$154,200
Attic conversion framing showing insulation and dormer window
Brooklyn, NY
Avg: $56,800 · $19,200–$147,000
Attic conversion framing showing insulation and dormer window
Buffalo, NY
Avg: $36,800 · $12,400–$95,200
Attic conversion framing showing insulation and dormer window
Rochester, NY
Avg: $35,200 · $11,900–$91,100

California

Attic conversion framing showing insulation and dormer window
Los Angeles, CA
Avg: $54,800 · $18,500–$141,800
Attic conversion framing showing insulation and dormer window
San Diego, CA
Avg: $51,200 · $17,300–$132,500
Attic conversion framing showing insulation and dormer window
San Jose, CA
Avg: $60,800 · $20,500–$157,300
Attic conversion framing showing insulation and dormer window
San Francisco, CA
Avg: $63,200 · $21,300–$163,500
Attic conversion framing showing insulation and dormer window
Sacramento, CA
Avg: $47,200 · $15,900–$122,100

Illinois

Attic conversion framing showing insulation and dormer window
Chicago, IL
Avg: $47,600 · $16,100–$123,200
Attic conversion framing showing insulation and dormer window
Aurora, IL
Avg: $43,200 · $14,600–$111,800
Attic conversion framing showing insulation and dormer window
Naperville, IL
Avg: $48,800 · $16,500–$126,300

Texas

Attic conversion framing showing insulation and dormer window
Houston, TX
Avg: $38,800 · $13,100–$100,400
Attic conversion framing showing insulation and dormer window
San Antonio, TX
Avg: $36,000 · $12,200–$93,200
Attic conversion framing showing insulation and dormer window
Dallas, TX
Avg: $40,400 · $13,600–$104,500
Attic conversion framing showing insulation and dormer window
Austin, TX
Avg: $43,600 · $14,700–$112,800
Attic conversion framing showing insulation and dormer window
Fort Worth, TX
Avg: $39,200 · $13,200–$101,400
Attic conversion framing showing insulation and dormer window
El Paso, TX
Avg: $32,800 · $11,100–$84,900

Arizona

Attic conversion framing showing insulation and dormer window
Phoenix, AZ
Avg: $38,000 · $12,800–$98,300
Attic conversion framing showing insulation and dormer window
Tucson, AZ
Avg: $35,200 · $11,900–$91,100
Attic conversion framing showing insulation and dormer window
Scottsdale, AZ
Avg: $44,800 · $15,100–$115,900

Pennsylvania

Attic conversion framing showing insulation and dormer window
Philadelphia, PA
Avg: $45,600 · $15,400–$118,000

Florida

Attic conversion framing showing insulation and dormer window
Jacksonville, FL
Avg: $38,000 · $12,800–$98,300
Attic conversion framing showing insulation and dormer window
Miami, FL
Avg: $44,800 · $15,100–$115,900
Attic conversion framing showing insulation and dormer window
Tampa, FL
Avg: $42,000 · $14,200–$108,700
Attic conversion framing showing insulation and dormer window
Orlando, FL
Avg: $40,800 · $13,800–$105,600
Attic conversion framing showing insulation and dormer window
Fort Lauderdale, FL
Avg: $46,000 · $15,500–$119,000

Ohio

Attic conversion framing showing insulation and dormer window
Columbus, OH
Avg: $35,600 · $12,000–$92,100

North Carolina

Attic conversion framing showing insulation and dormer window
Charlotte, NC
Avg: $37,200 · $12,600–$96,300

Washington

Attic conversion framing showing insulation and dormer window
Seattle, WA
Avg: $48,800 · $16,500–$126,300

Colorado

Attic conversion framing showing insulation and dormer window
Denver, CO
Avg: $43,200 · $14,600–$111,800
Attic conversion framing showing insulation and dormer window
Colorado Springs, CO
Avg: $40,000 · $13,500–$103,500
Attic conversion framing showing insulation and dormer window
Aurora, CO
Avg: $41,600 · $14,000–$107,600

Massachusetts

Attic conversion framing showing insulation and dormer window
Boston, MA
Avg: $54,000 · $18,200–$139,700

Tennessee

Attic conversion framing showing insulation and dormer window
Nashville, TN
Avg: $38,400 · $13,000–$99,400

Oregon

Attic conversion framing showing insulation and dormer window
Portland, OR
Avg: $46,000 · $15,500–$119,000

Michigan

Attic conversion framing showing insulation and dormer window
Detroit, MI
Avg: $36,400 · $12,300–$94,200

Georgia

Attic conversion framing showing insulation and dormer window
Atlanta, GA
Avg: $39,200 · $13,200–$101,400
Attic conversion framing showing insulation and dormer window
Augusta, GA
Avg: $32,800 · $11,100–$84,900
Attic conversion framing showing insulation and dormer window
Savannah, GA
Avg: $36,000 · $12,200–$93,200
Attic conversion framing showing insulation and dormer window
Marietta, GA
Avg: $40,800 · $13,800–$105,600

Minnesota

Attic conversion framing showing insulation and dormer window
Minneapolis, MN
Avg: $42,000 · $14,200–$108,700

Virginia

Attic conversion framing showing insulation and dormer window
Richmond, VA
Avg: $37,600 · $12,700–$97,300

Frequently asked questions

Attic conversions average $40,000 nationally in 2026 for a typical 400 sq ft bedroom + half bath conversion. Bedroom-only basics start near $15,000; master suite conversions with full bath reach $60,000-$90,000. Per-square-foot $80-$225 installed.