Lowell-based ADU builder
ADU Builder in Lowell, MA
Short answer: FJ Global Custom Builds is a Lowell-based contractor owned by Fredy Justino that designs and builds accessory dwelling units (ADUs) and in-law units for homeowners in Lowell and nearby towns. Since February 2, 2025, Lowell allows one ADU by right in single-family zones, up to 900 sq ft or half the size of the main house, whichever is smaller.
ADUs we build in Lowell
- Detached backyard ADU
- Attached ADU / in-law addition
- Garage conversion ADU
- Basement apartment
Why a Lowell-based builder
We are based in Lowell, know the local building department process, and the owner meets you on site for a free written estimate. Licensed Massachusetts contractor with $1M liability insurance.
How it works
- Free site visit and measurements.
- Written estimate and ADU layout.
- Drawings and building permit with the City of Lowell.
- Construction and inspections.
- Certificate of occupancy.
FAQ
Can I build an ADU in Lowell, MA?
In most single-family zones, yes. One ADU up to 900 sq ft (or half the main house) is allowed by right; you need a building permit.
How much does an ADU cost in Lowell?
New ADUs in Massachusetts typically cost about $275 to $450 per square foot; garage and basement conversions usually cost less. See our ADU cost guide.
Do I have to live in the house to rent the ADU?
No. State law does not allow towns to require owner-occupancy for by-right ADUs, though short-term rentals may be limited.
Which towns near Lowell do you serve?
Lowell, Chelmsford, Dracut, Tewksbury, Billerica, Westford, Tyngsborough, Methuen and southern New Hampshire.
General information, not legal advice; confirm details with the City of Lowell building department.
Related services and guides
Planning an ADU in Lowell? Free estimate: (781) 527-9445.
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