Home Addition Cost in NJ: Price Per Square Foot & Add-a-Level
What a home addition costs in NJ in 2026 by price per square foot and addition type, including the add-a-level second story, plus what moves the number.
What a home addition costs in NJ in 2026 by price per square foot and addition type, including the add-a-level second story, plus what moves the number.
Expert home remodeling advice from Kubat Construction, a licensed and insured New Jersey Home Improvement Contractor (NJ HIC #13VH12323700) headquartered in Pitman, NJ. Founded in 2009, we serve homeowners across Gloucester County, Camden County, and Burlington County with kitchen remodeling, bathroom renovations, basement finishing, home additions, custom cabinetry, interior renovations, and design-build services.
Home Addition Cost Per Square Foot in NJ (2026)
Most New Jersey home additions land between $200 and $500 per square foot of new finished space. By type: a bump-out runs $300 to $500 per square foot, a single-story room addition $250 to $400, a second-story add-a-level $300 to $500, a primary or in-law suite with a bathroom $325 to $500, and a sunroom or four-season room $200 to $350. Additions with plumbing (kitchens, bathrooms, laundry) always sit at the top of the range.
In real terms, a 400 square foot single-story family room runs roughly $100,000 to $160,000, a 200 square foot kitchen bump-out $70,000 to $110,000, a 600 to 800 square foot primary suite addition with a bath $200,000 to $350,000, and a full add-a-level second story on a ranch $250,000 to $450,000 or more. Add-a-level costs sit at the top because you remove the roof, verify or reinforce the foundation and first-floor structure, frame and roof the second floor, extend plumbing and HVAC vertically, and re-side and re-roof to match. Gloucester County permits usually take 4 to 8 weeks and construction runs 3 to 6 months.
Service Area
Pitman, Mullica Hill, Mantua Township, Glassboro, Sewell, Washington Township, Turnersville, Deptford, Woodbury, Swedesboro, Wenonah, Clayton, Williamstown, Woodstown, Cherry Hill, Haddonfield, Voorhees, Collingswood, Haddon Township, Gloucester Township, Berlin, Moorestown, Marlton, Medford, Mount Laurel, Cinnaminson, and surrounding South Jersey communities.
Free Estimate
Call (856) 214-9156 or visit our contact page for a free, no-obligation remodeling estimate. We respond to inquiries within one business day.
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