Looking for a basement contractor in Marlborough, MA? Describe your project once and up to three basement contractors who work in Marlborough and Middlesex County get back to you with a quote. It's free and there is no obligation.
Marlborough is home to about 42,169 people (2024 Census Bureau estimate), a stable community (+0.9% since 2020). With 2,021 people per sq mi, it is a suburban area. Full basements are common here and often the cheapest way to add living space.
Marlborough at a glance
- Population (Census Bureau estimate, 2024)
- 42,169 (+0.9% since 2020)
- Rank in Massachusetts
- 33rd of 58 cities and towns
- Land area
- 21 sq mi
- Population density
- 2,021 people per sq mi (suburban)
- Type
- City (Marlborough city)
- Main county
- Middlesex County
What to check before hiring in Marlborough
- Moisture first: waterproof before finishing.
- Egress: in Massachusetts, a basement bedroom needs an escape opening.
- Radon: test before you finish.
- Price drivers: size, bathroom, ceiling height, finishes and egress.
Useful official resources
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ICC: International Code Council
Official information and guidance.
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EPA: radon
Official information and guidance.
Services available in Marlborough
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Basement finishing
Framing, insulation, electrical, drywall and flooring of a basement, with permit.
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Basement bathroom or rental unit
Bathroom, kitchenette or legal basement unit with egress and plumbing.
Frequently asked questions in Marlborough
How much does basement finishing cost in Marlborough, MA?
It depends on size, bathroom and finishes. Describe your basement: contractors who serve Marlborough reply with a quote.
How long does it take?
Often several weeks.
Can I rent it out?
Only if local rules allow an accessory unit; check zoning.
Which basement contractors will contact me?
Up to three independent basement contractors who serve Marlborough and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.