An accessory dwelling unit in Malden can be a converted garage, a finished basement or attic, or a new detached unit in the backyard. Each path is a self-contained home with its own kitchen, bath, and entrance, and the right approach depends on your lot, your existing structure, and how the utilities run.
Malden's dense lots and older two- and three-family stock make conversions especially attractive, while single-family parcels near Oak Grove and Edgeworth can often support a compact detached build. The work centers on framing, egress, fire separation, and connecting heat, water, and power correctly.
A Malden ADU requires building permits under 780 CMR, with electrical, plumbing, and gas permitted separately by licensed trades and inspected through the city.
A typical JRH ADU project in Malden includes:
Garage, basement, or attic conversion, or a new detached backyard unit.
A full second kitchen and bathroom with dedicated utility connections.
Proper egress, fire separation, insulation, and efficient heating.
Design that fits Malden lot sizes and the 900-square-foot by-right limit.
It is ideal if you want rental income, space for family, or added property value from an underused garage, basement, or yard.
The process starts with a free in-home consultation and a look at your Malden lot, existing structure, and utilities, followed by an itemized written estimate and scope that includes design and permit handling.
After you approve the plan, JRH files building permits through Malden's Inspectional Services Department using the city's EnerGov Self-Service portal, while licensed electricians, plumbers, and gas fitters pull their own permits as Massachusetts requires. We confirm the design meets the state's by-right ADU standards.
We then build the conversion or detached unit with inspections at the required stages, finishing with a final walkthrough and city sign-off. Timelines depend on whether you convert existing space or build new.
Yes. Malden's Inspectional Services Department (ISD) requires a building permit for an accessory dwelling unit under the Massachusetts State Building Code (780 CMR), which covers construction, alteration, repair, and change of occupancy. The narrow exceptions are ordinary repairs such as painting, wallpapering, and minor finish work.
Electrical, plumbing, and gas are permitted separately, and each must be pulled by a licensed trade rather than by the homeowner. In Malden's many two- and three-family buildings, the city expects a registered contractor to hold the permit.
JRH files through Malden's online EnerGov Self-Service permitting portal and carries the project through every required inspection, so the work stays code-compliant and protects the home at resale. Malden ISD is located at 215 Pleasant Street, Room 330, and can be reached at (781) 397-7030.
The most common way a Malden project goes wrong is skipping permits: unpermitted work tends to surface during a future sale or refinance and costs far more to correct than to do right the first time.
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 Malden, 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 Malden 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 handles ADU projects throughout Malden, including Edgeworth, Maplewood, Linden, Forestdale, the West End, Bellrock, Faulkner, Oak Grove, and around Malden Center.
Malden sits in Middlesex County under ZIP code 02148, just north of Boston with Orange Line service at Malden Center and Oak Grove. Its housing is a dense mix of triple-deckers, two- and three-family homes, and Victorians, with a growing wave of condo conversions. Edgeworth was even named one of the hottest neighborhoods in the country by Boston Magazine.
JRH Constructions is a licensed Massachusetts home improvement contractor (MA HIC #204867), registered and active, so your Malden project is covered by the state's HIC consumer-protection framework. We are fully insured, and every permit is pulled and inspected through the City of Malden.
Based in Lynn and working across Malden's triple-deckers, Victorians, and condo conversions, JRH pairs local knowledge with code-compliant ADU construction. Call (781) 520-1982 for a free in-home estimate.
Because JRH is a registered Massachusetts Home Improvement Contractor (#204867), your Malden ADU project is covered by the state's HIC consumer-protection framework, and every stage is permitted and inspected through the City of Malden rather than done off the books.
