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Adu cost — Cambridge, MA

Looking for adu cost in Cambridge, MA? Call AccessoryDwellingUnit Pros for a contact a provider — no obligation. Licensed adu builders serve Cambridge and the surrounding area, and you'll get straight answers on timing and what affects the price.

Last updated: September 24, 2026

What affects the price

Building an ADU is a custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.

About this service

Your ADU budget is influenced by the type of foundation, the connection of plumbing and electrical lines, and the materials used for the exterior and interior. Converting an existing structure is generally different from building a new foundation from scratch. Exact pricing confirmed free on the call.

Frequently asked in Cambridge

What are emergency ADUs?

While we don't offer 'emergency' ADU services in the sense of immediate, unplanned builds, we understand the urgency some homeowners in Cambridge may feel. Our focus is on efficient planning and construction processes to expedite the project as much as regulations allow. For homeowners needing swift ADU solutions, our streamlined approach aims to complete the design and build phases efficiently. We prioritize timely project completion within regulatory frameworks.

What are accessory dwelling unit contractor San Diego services?

Accessory dwelling unit contractor services in San Diego are governed by California state law and San Diego's local ordinances, which differ from Massachusetts regulations. Our services are specifically tailored to the laws and building codes of Massachusetts and Cambridge. We provide direct ADU construction expertise for this region, ensuring full compliance with local requirements. We focus on delivering high-quality ADUs within the Cambridge area.

What is an ADU builder?

An ADU builder is a professional or company that specializes in the design, permitting, and construction of accessory dwelling units. They possess the expertise to navigate local zoning laws, building codes, and construction best practices specific to ADUs. In Cambridge, an ADU builder must be well-versed in Massachusetts state ADU legislation and Cambridge's municipal requirements. We are that specialized builder, offering direct services.

What are homes with mother-in-law suites?

Homes with mother-in-law suites, often referred to as accessory dwelling units (ADUs), are properties that include a secondary, independent living space. These suites are typically equipped with their own kitchen, bathroom, and living area, providing comfortable accommodations for family members or renters. They can be attached to the main house, detached structures, or conversions of existing spaces like garages. We specialize in building these functional suites in Cambridge.

What are accessory dwelling unit homes?

Accessory dwelling unit homes are properties that feature a secondary, independent living unit in addition to the primary residence. These units, commonly known as ADUs or in-law suites, are designed to provide separate living quarters. They can be integrated into the main house, built as detached structures, or created from existing spaces like garages or basements. We construct these versatile homes in Cambridge.

Are there affordable ADU options in Cambridge?
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Also serving nearby: Newton · Boston · Quincy · Lynn · Brockton

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More on this: HUD ADU resources — ADU policy and financing research.

Service area details

118,214residents
18,479per sq mile
6ZIP codes served

Serving all of Cambridge — population 118,214; about 18,479 residents per square mile across 6.4 sq mi. ZIP codes covered include 02138, 02139, 02140, 02141, 02142, 02238.

Neighborhoods served in Cambridge: East Cambridge, West Cambridge, Mid-Cambridge, Inman Square, Central Square — and every surrounding area.

Areas we serve

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