What Homeowners Don’t Realize About Building an ADU in Massachusetts
Building an Accessory Dwelling Unit (ADU) isn’t just about adding more space—it’s about navigating a process that’s layered, technical, and often misunderstood. And in Massachusetts, where zoning laws change town to town, knowing the steps isn’t enough—you need to know the why behind each one.
At Mass ADU, we don’t just build—we educate, guide, and manage the process for you. If you’re thinking about adding an ADU, here’s what most homeowners don’t realize—but should.
1. Zoning Isn’t a Yes or No Question—It’s a Local Puzzle
One of the biggest misconceptions we hear is: “If my town allows ADUs, I can build one.” But in reality, every lot has its own limitations. Just because ADUs are allowed doesn’t mean your exact property qualifies—or that it qualifies for the kind you want to build (detached vs. garage conversion vs. basement unit).
That’s why we start with a detailed zoning and site assessment. We don’t rely on generic checklists—we look at your setbacks, lot coverage, slope, utility access, and any special overlays (like wetlands or historic districts). Then we show you what’s actually possible.
2. ADU Design Isn’t One-Size-Fits-All—and It Can’t Be
ADUs are smaller, but that doesn’t make them simpler. You have to work within square footage limits, height restrictions, and utility connection requirements—all while designing something functional and code-compliant.
We don’t provide in-house design, but we work closely with a trusted architect or one you choose. What we do offer is project coordination that ensures your plans meet zoning, code, and practical use from day one—before costly revisions derail your timeline.
3. Permitting Can Be the Longest Step—If You’re Not Prepared
The time it takes to build an ADU isn’t just about construction—it’s about the approval process. Some towns move fast. Others require zoning board hearings, abutter notifications, or input from multiple departments.
We prepare all permit applications, handle the back-and-forth with town officials, and keep the process moving with minimal stress on your end. Most delays happen when homeowners or contractors don’t submit complete or correct documentation. We make sure that doesn’t happen.
4. Construction Near Your Home Requires Special Consideration
Unlike a renovation inside your home, ADU construction often happens just a few feet from your back door. That brings unique challenges—protecting your main property, managing logistics in tight areas, and ensuring minimal disruption.
Our crews are experienced in working within these constraints. We also keep you in the loop with weekly updates, so you know what’s happening at every stage.
5. Completion Is Just the Beginning
Finishing construction is a major milestone—but getting your ADU truly move-in ready takes a little more. From final inspections to utility setup, there are still a few important boxes to check before your new space is fully functional.
At Mass ADU, we help guide you through the final steps of the process, answer questions, and provide clarity around what’s next—whether it’s preparing for occupancy, registering the unit (if needed), or simply understanding how to care for your new space moving forward.
Our goal is to make sure you feel confident not just during the build, but after it too.
Real Expertise = Fewer Surprises
If there’s one thing we’ve learned working with Massachusetts homeowners, it’s that clarity matters. No one wants surprises—especially when it comes to zoning, timelines, or costs.
At Mass ADU, our process is built to reduce friction, keep you informed, and deliver results that make sense for your property and your goals.
📞 Call (617) 797-9167 or leah@mass-adu.com to start the conversation. No pressure. Just answers.
