Accessory Dwelling Unit (ADU) 

Custom Accessory Dwelling Units Built for Your Lifestyle

13 Gables Inc is your trusted partner for innovative, efficient, and stylish Accessory Dwelling Units (ADUs). Whether you want to create extra living space, offer a private retreat for guests, or boost your property value, our expert team delivers custom solutions tailored to your needs. Based in Central Massachusetts, we are constructing ADUs throughout the state and helping property owners achieve their exact goals. Contact us today to get started on your ADU project.

What is an ADU?

An Accessory Dwelling Unit (ADU) is a secondary housing unit located on a single-family residential lot. Often known as granny flats, in-law suites, or backyard cottages, ADUs provide a separate living space that includes a kitchen, bathroom, and sleeping area.

Why Build an ADU?

• Increased Property Value: Adding an ADU can significantly raise your home’s market value. 
• Rental Income: Generate passive income by renting your ADU long- or short-term. 
• Multi-Generational Living: Offer independent housing for family members while staying close. 
• Flexible Space: Use your ADU as a home office, studio, guesthouse, or more.

Our ADU Services 

At 13 Gables Inc, we manage the entire ADU process, including: 

• Consultation & Planning: Assess your lot, discuss your goals, and develop the best design. 
• Design & Permitting: Ensure your ADU meets all local codes and reflects your unique style. 
• Construction: Handle every aspect of the build, from foundation to finishing touches. 
• Project Management: Provide clear communication and oversight at every step.

Ready to bring your ADU vision to life? Get in touch with us today to get started.

Why Choose 13 Gables Inc?

Here’s what sets us apart when it comes to building your ADU with confidence and care:

• Expertise: Years of experience in custom home builds and ADU design. 
• Quality: Superior materials and craftsmanship on every project. 
• Transparency: Clear timelines, detailed estimates, and no hidden fees. 
• Personal Touch: We treat every project as if it were our own home. 

Have questions or ready to get started? Reach out to us today.

Common ADU Types 

Ready to Explore the Possibilities?

Contact 13 Gables Inc today for your free personalized ADU consultation, and let’s unlock your property’s full potential!

Massachusetts' New ADU Law (Effective February 2025)

Massachusetts enacted a major change to its housing policy with the Affordable Homes Act, which took effect on February 2, 2025. This law allows homeowners across the state to build Accessory Dwelling Units (ADUs) “by right”—meaning no special permissions or zoning variances are needed—in single-family residential zoning districts. Here’s what you need to know for 13 Gables Inc’s website:

Key Features of the New Law

• Built by Right: Homeowners may now construct an ADU on their property without needing discretionary zoning board approvals, as long as basic state requirements are met. This streamlines the process and removes significant previous barriers. 
• Size Limits: The ADU must be no larger than 900 square feet or half the gross floor area of the main home, whichever is smaller. 
• Types Allowed: ADUs can be detached cottages, attached additions, conversions of basements/garages, or built within an existing home. 
• Separate Entrance Required: The ADU must have its exterior entrance, which may be shared via a hall or corridor, but needs to comply with state building and fire safety codes. 
• No Minimum Lot Size: There are no minimum lot size requirements for adding an ADU. 
• No Additional Utility Hookups Required: Homeowners cannot be forced to install separate water, sewer, or electric connections for the ADU unless required by state law or the utility provider. 
• Municipal Limits: Towns and cities cannot restrict occupancy (e.g., by age or relationship), impose higher design or dimensional standards than those for single-family homes, or require extra studies, high fees, or subjective reviews. However, they can choose to set additional size restrictions or regulate the use of ADUs as short-term rentals. 
• Historic Districts: Stricter standards may apply in historic districts, but local rules cannot outright prohibit an ADU that meets state requirements.

Why This Matters

This legislation aims to: 

• Address the housing shortage in Massachusetts. 
• Give homeowners more flexibility—whether for multigenerational living, independent space for relatives, or supplemental rental income. 
• Remove the red tape that previously made ADU construction difficult or impossible in many regions. 

For Homeowners

• Opportunity: Homeowners in single-family zones can confidently plan ADUs, knowing state law is on their side. 
• Process: Projects must still follow local building codes and permitting processes, but approval is streamlined and protected by state law. 
• Uses: ADUs are ideal for aging parents, adult children, rental income, home offices, or guest suites.

Massachusetts Is Leading the Way

Massachusetts is now at the forefront of innovative housing policy, making it much easier for more people to create flexible, affordable living spaces on their property. 

For 13 Gables Inc: Let your clients know that, as of February 2025, you can help them take full advantage of these new ADU opportunities—guiding them from concept to completion, in line with the latest Massachusetts law.

13 Gables Inc — A Leader in Massachusetts for Constructing ADUs 

13 Gables Inc is recognized as a leader in Massachusetts for constructing ADUs due to its extensive experience, award-winning reputation, and comprehensive approach to project management. The company has over 38 years of expertise as a fully licensed and insured general contractor, specializing in custom home builds, renovations, and site development throughout Central Massachusetts and the Metro West area.

Key Reasons Why 13 Gables Inc Stands Out as a Leader for ADU Projects

• Award-Winning Reputation: 13 Gables is an award-winning Massachusetts general contractor with a proven track record for quality and customer satisfaction. 
• Full Licensing and Credentials: The firm holds multiple active contractor licenses and ranks in the top tier of Massachusetts builders, underlining a high standard of compliance and professionalism. 
• ADU-Specific Expertise: Their services include precision project management, tailored design consultations, and a deep understanding of local permitting and building codes—critical advantages for navigating Massachusetts’ new ADU regulations. 
• Local Knowledge: Decades of experience in the region ensure 13 Gables Inc can optimize ADU placement, design, and construction to maximize value and functionality for each property. 
• Comprehensive Service: From initial consultation through design, permitting, construction, and final walkthrough, the team provides seamless, end-to-end support—even handling after-hours needs and offering one-year limited warranties for peace of mind. 
• Customer Focus: Testimonials and client reviews emphasize the company’s fairness, quality materials, transparent pricing, and meticulous attention to detail.

This combination of experience, credibility, and comprehensive service positions 13 Gables Inc as a trusted leader for ADU projects under Massachusetts’ new statewide law. Homeowners can rely on 13 Gables to realize the full benefits of the updated ADU landscape, with expert guidance and execution at every stage.