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Budget planning guide

Room Addition cost in Boston, MA

A transparent starter-scope range for homeowners planning room addition in Boston, MA. Review the assumptions, then use the project estimator for your own scope.

Starter-scope range

$12,680–$17,900

Planning midpoint: $14,920

The planning model applies a higher regional cost factor for this market.

What the model includes

Starter scope and assumptions

Adjust quantities for your project

Foundation

200 sq ft × $21

$4,200

Framing

200 sq ft × $16.8

$3,360

Roofing

220 sq ft × $11.2

$2,460

Electrical & Plumbing

1 lump sum × $4,900

$4,900

This is a budgeting example based on a defined starter scope, not a quote or a live survey of local bids. Actual pricing depends on measurements, site conditions, material choices, permits, contractor availability, and the final scope.

Local guides

Compare starter scopes by city

New York, NYLos Angeles, CAChicago, ILHouston, TXPhoenix, AZPhiladelphia, PASan Antonio, TXSan Diego, CA

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