ADU Locator

1 Best ADU Builders in Holliston, Massachusetts

Verified ADU contractors and builders in Holliston, MA

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Modern Design & Build

Transform your Holliston garage into a functional living space with expert conversion services that maximize your home's potential. Our specialized team handles every detail, from design planning to final construction, creating seamless garage-to-living-space conversions tailored to your needs.

+1 508-308-1188
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Frequently Asked Questions — ADU Builders in Holliston

How much does it cost to hire an ADU builder in Holliston?

ADU construction costs in Holliston, Massachusetts vary widely depending on size, type, and site conditions. Detached ADUs typically range from $150,000–$400,000+, while garage conversions and attached ADUs can be more affordable. Contact multiple builders in Holliston to get accurate quotes for your specific project.

How long does it take to build an ADU in Holliston?

In Holliston, the ADU construction timeline typically ranges from 6 to 18 months from permit application to move-in. Permitting alone can take 2–6 months depending on Massachusetts local regulations. Prefab and modular ADUs often have faster timelines than site-built units.

Do I need a permit to build an ADU in Holliston?

Yes, a building permit is required for ADU construction in Holliston, Massachusetts. Your ADU builder will typically handle the permit application as part of their service. Massachusetts has adopted streamlined ADU permitting laws in recent years, which may reduce wait times.

What types of ADUs can be built in Holliston?

Common ADU types in Holliston include detached ADUs (backyard cottages), attached ADUs, garage conversions, basement conversions, and prefab/modular ADUs. The best type for your property depends on lot size, zoning, and budget. A local Holliston ADU builder can advise on what's allowed on your specific parcel.