An accessory dwelling unit in Peabody can be a detached backyard cottage, a garage conversion, or a basement or attic unit carved from the existing house. Each is a complete, independent living space with its own kitchen, bath, and entrance.
West Peabody's larger single-family lots suit detached ADUs and garage conversions, while homes closer to Downtown and Central Peabody more often add a unit inside the existing structure. The path you choose sets the foundation, utility, and egress work involved.
Every ADU needs code-compliant egress, ventilation, and separate or properly sized utilities, so it is real construction under 780 CMR, not a simple finish job.
We start with a free in-home consultation to look at your lot and house and talk through whether a detached unit, garage conversion, or interior conversion fits best, then provide an itemized estimate and scope.
JRH confirms the design against the state ADU law and Peabody's local rules, then files the building permit with the City of Peabody Building Department through the OpenGov portal. Licensed electricians and plumbers pull their own permits for the new unit's systems.
We handle foundation or conversion work, framing, rough-ins, inspections, and finishes through to final sign-off. The timeline depends on whether you build new or convert existing space and how far utilities have to run.
Yes. Building an ADU in Peabody requires a building permit under 780 CMR, plus separate electrical and plumbing permits pulled by licensed trades for the new unit.
Since 2025, under the Affordable Homes Act, an ADU of up to 900 square feet is allowed by-right in single-family zones across Massachusetts, which limits the discretionary review a city can impose. JRH files and coordinates the permits through the City of Peabody Building Department and its OpenGov portal.
In Massachusetts, ADUs generally run from about $150,000 to $450,000 or more, with detached new builds around $225,000 to $450,000, garage conversions near $150,000 to $200,000, and basement or attic conversions about $175,000 to $250,000 (D&G Exteriors, MA, 2025). In Peabody, your cost depends on whether you convert existing space or build new, and on how far utilities have to run.
Statewide rules changed in 2025: under the Affordable Homes Act, an ADU of up to 900 square feet is now allowed by-right in single-family zones across Massachusetts. Mass Save can also offset efficient heating, water heating, and insulation in the new unit.
Because JRH is a registered contractor, your Peabody project is also covered by the state's Home Improvement Contractor program and Guaranty Fund. We give a free, itemized in-home estimate, with no starting-at guesswork.
JRH builds accessory dwelling units across Peabody, including West Peabody, South Peabody, Central Peabody, Gallows Hill, Needham Corner, Northfields, Witchcraft Heights, Gardner Park, and Downtown.
Peabody sits in Essex County under ZIP code 01960. West Peabody's larger single-family lots suit detached backyard ADUs and garage conversions, while homes closer to Downtown and Central Peabody more often add a unit through a basement or attic conversion. Under the 2025 state law, an ADU up to 900 square feet is allowed by-right in single-family zones citywide.
Because JRH is a registered Massachusetts Home Improvement Contractor (#204867), your Peabody ADU is covered by the state's HIC consumer-protection framework, and the construction and systems are permitted and inspected through the City of Peabody.
