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Defining the ADU: More Than Just Extra Space

An Accessory Dwelling Unit (ADU) is a permanent, self-contained home located on the same property as your primary residence. It is a sophisticated architectural solution—not just a finished basement or a simple bedroom addition.

To be a legal ADU, the structure must feature its own kitchen, bathroom, and private entrance, while meeting strict local zoning bylaws, building codes, and safety requirements.

Why Homeowners Are Partnering with Build Mark for ADUs:

At Build Mark, we specialize in helping property owners unlock the hidden potential of their land. In today’s market, ADUs have become the gold standard for:

  • Multi-Generational Living: Provide parents or adult children a private, dignified home just steps away.

  • Aging-in-Place: Create a custom, accessible, single-level living space for long-term comfort.

  • Passive Income Generation: Turn your backyard into a legal rental unit to offset your mortgage.

  • Equity Growth: Instantly increase your property’s market value with a high-demand secondary dwelling.

 

Defining the ADU: More Than Just Extra Space

An ADU is not automatically the same as a Home Addition or Basement Finishing

Home Addition expands the primary residence but does not create a separate dwelling unit.

Finished Basement may add living space but does not automatically qualify as a legal rental unit.

An ADU is a defined secondary dwelling that meets specific municipal criteria.

What Does It Cost to Build an
ADU
in Central Massachusetts?

Small Studio ADU

Under 500 sq ft

One-Bedroom ADU

500–800 sq ft

Larger Detached ADU

800+ sq ft

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