Boston, MA · Updated 2026

How Much Does Room Addition Cost in Boston, MA?

Average room addition costs in Boston range from $12,685 to $17,163. Get a free, customized estimate below.

40% above national averageFree · No Signup Required

Room Addition Cost Breakdown — Boston, MA

ItemUnitQtyUnit PriceTotal
Foundationsq ft200$21.00$4200.00
Framingsq ft200$16.80$3360.00
Roofingsq ft220$11.20$2464.00
Electrical & Plumbinglump sum1$4900.00$4900.00
Estimated Total$14,924.00

* Prices are estimates based on Boston market rates. Actual costs may vary based on project specifics.

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Labor line 1

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Material line 1

Line total$4,200

Material line 2

Line total$3,360

Material line 3

Line total$2,464

Material line 4

Line total$4,900

Frequently Asked Questions — Room Addition in Boston

How much does room addition cost in Boston, MA?

The average cost for room addition in Boston, MA ranges from $12,685 to $17,163, depending on project scope, materials, and labor rates. Boston costs are above the national average due to higher labor and material costs in the region.

How do I get a free room addition estimate in Boston?

Use Brixor's free online estimate generator above. Enter your project details, customize line items for your specific needs, and download a professional PDF estimate instantly.

What factors affect room addition costs in Boston?

Key factors include project size and complexity, material quality, labor rates in Boston (MA), permit requirements, accessibility of the work area, and seasonal demand. Getting multiple estimates is recommended.