Additions — 8-16 weeks
How Much Does a Room Addition Cost in 2026?
Build a new room addition including foundation, framing, roofing, and all finishes.
National Average
$50,000
for 250 sq ft
Low: $25,000High: $100,000
Calculate for Your Size & StateCost Breakdown
Labor (50%)
$25,000
Materials (50%)
$25,000
Cost per sq ft
$200
What's Typically Included
Foundation/slab
Framing
Roofing
Siding to match
Windows & door
Electrical
HVAC extension
Insulation & drywall
Flooring
Paint
Room Addition Cost by State
Based on 250 sq ft. Prices reflect regional labor and material cost differences.
MS
$38,000
AR
$39,000
WV
$40,000
AL
$41,000
OK
$41,000
KY
$42,000
SC
$42,000
LA
$42,500
SD
$42,500
TN
$42,500
KS
$43,000
IA
$43,500
GA
$44,000
IN
$44,000
MO
$44,000
NE
$44,000
NM
$44,000
NC
$44,000
OH
$45,000
TX
$45,000
ID
$46,000
MI
$46,000
ND
$46,000
WY
$46,000
AZ
$47,500
FL
$47,500
MT
$47,500
UT
$47,500
WI
$47,500
DE
$51,000
ME
$51,000
MN
$51,000
NV
$51,000
PA
$51,000
VA
$51,000
IL
$52,500
CO
$54,000
NH
$54,000
OR
$54,000
VT
$54,000
MD
$55,000
RI
$56,000
WA
$57,500
CT
$60,000
NJ
$61,000
MA
$62,500
NY
$64,000
CA
$65,000
AK
$67,500
DC
$67,500
HI
$72,500
Other Cost Guides
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