Median new-home construction costs range from $146.64 per square foot in the South to $220.95 per square foot in the Northeast, according to U.S. Census Bureau data on homes built in 2023 — a swing of more than 50% depending entirely on where you live. Nationally, the average cost to build sits at $162 per square foot, per the National Association of Home Builders’ 2024 construction cost survey, the highest figure in the history of that annual series. That single national number gets quoted constantly in addition budgeting, and it hides almost everything useful. Additions track regional labor and material markets the same way whole-house construction does, since you’re hiring the same contractors, pulling permits from the same local building department, and buying lumber and drywall from the same regional suppliers either way. NAHB itself acknowledges the limits of a single blended figure: its own construction-cost survey notes that its national sample isn’t large enough to break results out by region, even though the report’s authors are explicit that labor costs, land costs, and local building practices all vary by location. Census fills that gap. Run a 200-square-foot addition, a common size for a home office, mudroom, or expanded kitchen nook, through each region’s cost profile and the gap between a Southern project and a Northeastern one stops being a rounding error and starts being a real budgeting problem.
South: About $29,300 for 200 Square Feet
At $146.64 per square foot, the South posts the lowest regional construction cost in the country, which puts a 200-square-foot addition around $29,328 before you account for site-specific complications like grading or utility tie-ins. Lower labor costs, cheaper land, and a construction season that isn’t shortened by frozen ground all help keep this number down relative to the rest of the country. It’s also the region where a homeowner is most likely to find a national cost estimate genuinely useful, since the South’s figure sits closest to a lot of the generic per-square-foot numbers that circulate online.
Midwest: About $31,250
The Midwest comes in at $156.25 per square foot, putting the same 200-square-foot project around $31,250, just above the South and still well under the national blended average once you weight it against the pricier coasts. Cities like Chicago and Minneapolis pull the regional number up somewhat, but rural and small-metro markets across the Midwest keep the overall figure closer to Southern pricing than to either coast.
West: About $39,100
Western construction costs jump to $195.38 per square foot, pushing a 200-square-foot addition to roughly $39,076. Land and labor scarcity in West Coast metro markets pull this regional average up well past the Midwest and South, even before factoring in the permitting timelines that tend to run longer in high-demand cities like Seattle, Portland, and the Bay Area, where a single inspection delay can add weeks to a project that would move much faster in a smaller Southern or Midwestern jurisdiction.
Northeast: About $44,200
The Northeast tops the list at $220.95 per square foot, the highest of any region Census tracks, bringing that same 200-square-foot addition to about $44,190. That’s roughly $14,900 more than the identical project would run in the South, for work that’s functionally the same square footage of framing, drywall, and finishes. Older housing stock in much of the Northeast adds another wrinkle contractors in newer Sun Belt markets rarely deal with: outdated wiring, older foundations, and tighter urban lot lines that all add labor hours before the visible part of the addition even starts.
None of these figures include the fixed costs that hit small additions especially hard: permits, demolition, and tying new framing into existing plumbing or electrical, which is why Angi’s national data puts ground-level bump-outs at $80 to $200 per square foot and second-story additions at $300 to $500 per square foot, both well above raw new-construction pricing. Layer the regional Census numbers on top of those baselines and a homeowner in Boston or San Francisco budgeting off a national average is almost guaranteed to come up short, while someone in Texas or Georgia using the same number may be padding their budget for no reason. Get a regional-specific quote before you get attached to any number you found in a national headline, including this one.
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