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.
Room Addition Cost Breakdown — Boston, MA
| Item | Unit | Qty | Unit Price | Total |
|---|---|---|---|---|
| Foundation | sq ft | 200 | $21.00 | $4200.00 |
| Framing | sq ft | 200 | $16.80 | $3360.00 |
| Roofing | sq ft | 220 | $11.20 | $2464.00 |
| Electrical & Plumbing | lump sum | 1 | $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.
Estimate
Ref ID: EST-2026-4FWX
Date Issued
May 6, 2026
Client
Project Details
Site Address
Start Date
End Date
Scope of Work
Materials
| Material Specification | Units | Amount | Ext. Total | |
|---|---|---|---|---|
$ | $4,200 | |||
$ | $3,360 | |||
$ | $2,464 | |||
$ | $4,900 |
Labor
| Service Specification | Type | Hrs | Rate | Ext. Total | |
|---|---|---|---|---|---|
Craftsmanship Guarantee | $ | $600 |
Contractual Agreements & Conditions
Total
$15,524
Draft
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. No signup or credit card required.
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.