John Crowley Construction Co

ADU Design and Construction on the South Shore of Massachusetts

John Crowley Construction Co offers turnkey accessory dwelling unit (ADU) construction services throughout the South Shore of Massachusetts. Whether a homeowner is looking to create a mother-in-law suite, a rental unit for additional income, or a private guest house, the company provides end-to-end services from initial design through to final inspection. They serve Pembroke, MA, and surrounding communities including Hanover, Norwell, Hingham, Cohasset, Scituate, Duxbury, Marshfield, Kingston, and Plymouth.

An Accessory Dwelling Unit — sometimes referred to as an in-law suite, granny flat, or backyard cottage — is a self-contained residential unit built on the same property as a primary home. ADUs can be attached, detached, or converted from existing structures such as garages or basements. They typically include a kitchen, bathroom, sleeping area, and a separate entrance, offering privacy and independence while remaining on the same property.

Types of ADUs John Crowley Construction Co Builds

The company offers several ADU configurations depending on the property, lifestyle, and budget of the homeowner:

1. Detached ADU: A stand-alone structure suitable for use as a guest house or rental unit.
2. Attached ADU: An addition connected to the main home, commonly used for extended family living arrangements.
3. Garage Conversion: An existing garage is converted into a livable apartment or studio space.
4. Basement ADU: Existing lower-level space is transformed into a suite with private access and proper egress.

Homeowners in Pembroke, Plymouth, and surrounding South Shore communities can build an ADU with the right design, permits, and construction oversight. John Crowley Construction Co manages all of these steps on behalf of their clients.

It is worth noting the distinction between ADUs and in-law suites. In Massachusetts, Accessory Dwelling Unit is the official legal term for a secondary residential unit on the same property as a primary home. All in-law suites qualify as ADUs, but not all ADUs are in-law suites — some serve as rental units, home offices, or guest accommodations.

Adding an ADU to a property can offer several practical benefits:

1. Multi-generational living: Provides independent space for aging parents or adult children.
2. Rental income: A legally permitted rental unit can generate consistent monthly revenue.
3. Property value: Additional living space can increase the resale appeal of a home.
4. Smaller footprint: Energy-efficient ADU designs can reduce overall environmental impact.

Permitting, Safety, and Project Management

Massachusetts has specific safety requirements for basement and attached ADUs, including egress windows and separate entryways. John Crowley Construction Co handles the installation of these features to ensure all new living spaces meet local building codes.

The company manages the full scope of an ADU project, including:

1. Design consultation and planning
2. Zoning and permitting assistance
3. Full construction and project management
4. Interior finishes and customization

John Crowley Construction Co holds a Massachusetts State License (#114197) and carries full insurance. With over 25 years of experience as a general contractor on the South Shore, they bring practical knowledge of local regulations and construction standards to each ADU project they undertake.