Home Additions in Marlborough, MA

Marlborough, MA at a glance

County

Middlesex County, Massachusetts · 47 places we serve there

From our base

About 5 miles east

Building permits

Marlborough's building department

Contractor rules

MA Home Improvement Contractor registration (M.G.L. c.142A)

Nearest documented addition project

Front Porch Addition in Needham, MA

17 mi east of Marlborough

• Also in Marlborough: a client review of our first-floor remodel

Our documented addition and other work, by distance:

• Hudson, MA: client review of our bathroom remodel 3 mi north
• Northborough, MA: client review of our deck and small addition 5 mi west
• Westborough, MA: client review of our new siding and windows 6 mi southwest
• Framingham, MA: client review of our kitchen remodel 8 mi southeast
• Shrewsbury, MA: client review of our kitchen and bathroom remodel 9 mi southwest
• Needham, MA: porch addition 17 mi east
• Mansfield, MA: kitchen remodel 28 mi southeast
• Lynnfield, MA: addition and exterior remodel 29 mi northeast
• Lynnfield, MA: addition framing video 29 mi northeast
• Salem, NH: pool deck 35 mi northeast

Permits and rules in Marlborough, MA

An addition needs a building permit from Marlborough's building department and must meet local zoning rules such as setbacks. On septic, an added bedroom also needs Board of Health review under Title 5. Since February 2, 2025, one accessory dwelling unit, up to 900 square feet or half the main house if smaller, is allowed by right in single-family zones.

What's included

• Room & second-story additions
• In-law suites (ADUs)
• Sunrooms & porches
• Designer & engineer coordination

Costs and timelines: our home additions guide

How Much Does a Home Addition Cost in Massachusetts?

Distances: straight line, GeoNames data (CC BY 4.0). Updated October 8, 2026.