Detached ADU
A separate backyard unit provides privacy and a complete new layout. It requires careful planning for foundation work, setbacks, utilities, drainage and access.
Worcester and Worcester County ADU contractor
ADUs in Worcester built for family, flexibility and long-term value.
FJ Global builds detached accessory dwelling units, in-law suites, garage conversions and basement apartments for homeowners in Worcester and surrounding communities.
Call (517) 697-5491Detached ADUsGarage conversionsBasement apartmentsIn-law suitesLicensed contractor
Massachusetts ADU rules
A clearer path to a legal second unit
Massachusetts permits one accessory dwelling unit by right in single-family zoning districts under the statewide rule that took effect February 2, 2025. The unit may be up to 900 square feet or half the gross floor area of the principal home, whichever is smaller. By right means the project does not require a discretionary special permit, but zoning dimensions, building permits, utilities and code compliance still matter.
For Worcester homeowners, the first step is understanding what the existing house and lot can support. We review access, parking considerations, structure, utility routes and the intended occupant before defining the construction approach. FJ Global provides free on-site estimates and a licensed, English- and Portuguese-speaking team.
- Detached backyard cottages on new foundations
- Existing garage-to-apartment conversions
- Living space built above a garage
- Basement apartments with compliant egress
- Attached in-law suites and additions
- Framing, enclosure and finish coordination
ADU options
Choose a unit that fits the property
Garage conversion
Reusing a sound garage can reduce new exterior construction. The space still needs to meet residential standards for insulation, egress, fire safety, plumbing, electrical and heating.
Basement apartment
A basement may work well when ceiling height, moisture control, windows, exits and a separate entrance can be addressed. We evaluate those conditions before pricing finishes.
In-law suite
An attached suite can keep family close while providing a bedroom, bathroom, living area and appropriate kitchen facilities. Exterior details are planned to belong with the original home.
How the project works
From feasibility to final walkthrough
Property visit
We inspect the lot or conversion space and discuss who the unit serves.
Scope and permit
Plans, materials, utilities and permit requirements are coordinated around one scope.
Construction
Our team manages structural and finish stages with weekly progress updates.
Final review
We walk the completed unit with you and address closeout details.
Common questions
Worcester ADU questions
Can I build an ADU by right in Worcester?
Massachusetts allows one ADU by right in single-family zoning districts under the rule effective February 2, 2025, subject to size and code requirements. A building permit is still required, and the property must meet applicable dimensional and safety standards.
Can an existing garage or basement become an ADU?
Many can be converted when they meet requirements for structure, ceiling height, insulation, egress, fire separation, utilities and a legal entrance. We inspect the space before recommending a conversion scope.
How long does an ADU project take?
A conversion has a different schedule from a detached unit requiring site work and a foundation. After the visit, we outline the likely permit and construction sequence in writing.
Worcester County service area
ADU construction in Worcester and nearby towns
WorcesterShrewsburyGraftonAuburnHoldenMillburyLeominster
Related services
Considering an ADU in Worcester?
Tell us about the property and the type of unit you have in mind. We provide a free on-site estimate with practical next steps.
Request a Free Estimate