Accessory dwelling units adus — Cambridge, MA
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
ADUs are secondary housing units that provide extra space for guests, family, or renters. You should consider an ADU if you want to increase your property value or need more living space without moving. Prices typically vary based on the square footage, the quality of construction, and necessary utility upgrades for your specific lot. Exact pricing confirmed free on the call.
Frequently asked in Cambridge
What are accessory dwelling unit homes in Cambridge?
Accessory dwelling unit homes in Cambridge refer to properties that include a secondary, independent living unit in addition to the primary residence. These can take the form of detached backyard cottages, conversions of existing spaces like garages or attics, or additions to the main house that create a separate dwelling. They are designed to provide flexible housing options within the city's dense urban environment. Call for an estimate.
What are homes with in-law suites like in Cambridge?
Homes with in-law suites in Cambridge are essentially properties that have an accessory dwelling unit designed for the accommodation of family members. These suites typically include their own private entrance, kitchen facilities, bathroom, and living space, offering a degree of independence while remaining on the same property as the main house. The design and construction must comply with Cambridge's specific zoning and building codes. Call for a quote.
What is a detached accessory dwelling unit in Cambridge?
A detached accessory dwelling unit in Cambridge is a secondary housing unit that is structurally separate from the primary dwelling on the same lot. These are often built as backyard cottages or small, independent structures. They must meet Cambridge's zoning requirements for setbacks, height, lot coverage, and parking, ensuring they integrate appropriately into the neighborhood fabric. Call for a quote.
What is involved in ADU building in Cambridge?
What are the options for accessory dwelling unit rental in Cambridge?
What accessory dwelling unit services are common in Cambridge?
What are accessory dwelling unit companies in Cambridge?
Also serving nearby: Newton · Boston · Quincy · Lynn · Brockton
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
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: Harvard Square, Central Square, Inman Square, Porter Square, Kendall Square — and every surrounding area.
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