Blog
Building an accessory dwelling unit (ADU) can feel exciting, but also overwhelming. There are a lot of moving parts: design, permitting, costs, construction, and everything in between. That’s why we created this blog, to give homeowners a clear, trustworthy resource as they explore what’s possible.
Here, you’ll find practical guides, answers to common questions, and insights from real projects. Whether you’re just starting to learn about ADUs or you’re ready to take the next step, our goal is to help you make informed decisions with confidence.
Massachusetts ADU Incentive Program: What Phase One Covers and What It Doesn’t
A practical guide for Massachusetts homeowners weighing an accessory dwelling unit (ADU). Last updated: October 6, 2026. Short answer: The Massachusetts ADU Incentive Program is a statewide initiative run by the Massachusetts Housing Partnership...
MassDEP Title 5 Septic Upgrade Deadlines and ADU Requirements in Massachusetts
A practical guide to septic, bedroom counts, and what your lot can support Last updated: September 30, 2026 What happens to an accessory dwelling unit (ADU) plan when the property is on septic instead of sewer? Short answer: an ADU septic system in...
Does an ADU Need Separate Utilities in Massachusetts?
What the state requires, what your town cannot, and when a separate connection still makes sense. If you are planning an accessory dwelling unit (ADU) in Massachusetts, you have probably heard conflicting things about utilities. Maybe someone at...
ADU Feasibility Study in Massachusetts: What It Covers and What It Costs
A practical guide for Massachusetts homeowners deciding whether to build Since the Affordable Homes Act made accessory dwelling units (ADUs) buildable by right across most of Massachusetts, the question homeowners ask us has shifted from "am I...
ADU South Shore MA: A Homeowner’s Guide to Costs, Rules, and Builders
What South Shore homeowners should know before adding an accessory dwelling unit, from the state's by-right law to septic systems and builder selection. If you own a home on the South Shore and you're considering an ADU (accessory dwelling unit)...
Garage Conversion ADUs in Massachusetts: Rules, Costs, and Whether Your Garage Qualifies
An underused garage may be the least expensive route to a legal rental unit or in-law apartment on your property. The question most homeowners start with: is a garage conversion ADU in Massachusetts actually allowed, and what is involved? Short...
How Much Does a 900 Sq Ft ADU Cost in Massachusetts?
A Practical Cost Guide for Greater Boston Homeowners If you're a homeowner weighing an accessory dwelling unit (ADU), the 900-square-foot size is likely on your mind for a reason: it's the largest unit most Massachusetts homeowners can build...
How to Choose an ADU Builder in Massachusetts
A Practical, Honest Guide for Greater Boston Homeowners Choosing who builds your accessory dwelling unit (ADU) is the decision that shapes cost, timeline, and whether the project gets permitted at all. So it’s worth slowing down before you sign...
Can I Build an ADU on My Property in Massachusetts?
A Homeowner's Guide to Checking Feasibility on Your Specific Lot If you've been reading about Massachusetts' ADU law, you already know the state-level answer: yes, homeowners can now build an accessory dwelling unit without the special permits and...
ADU Financing in Massachusetts: 2026 Guide for Homeowners
For years, building an accessory dwelling unit in Massachusetts meant navigating a patchwork of local zoning rules that made the whole idea feel more theoretical than practical. That changed in 2024, when Governor Healey signed the Affordable Homes...
MassHousing ADU Loan Program (2026): What Massachusetts Homeowners Need to Know
What Is the MassHousing ADU Loan Program? If you're a Massachusetts homeowner thinking about building an accessory dwelling unit, there's a new state-backed financing option worth knowing about and it's unlike anything currently available in the...
Hidden ADU Costs That Can Increase Your Budget in Massachusetts
Most homeowners price out an ADU the same way: pick a size and estimate a cost per square foot. It's a reasonable starting point but it doesn’t tell the whole story.. The costs that actually increase ADU budgets aren't usually tied to finishes or...
Are Modular ADUs Legal in Massachusetts? What Homeowners Need to Know
As interest in accessory dwelling units (ADUs) continues to grow across Massachusetts, many homeowners begin their research with a straightforward question: Are modular ADUs legal in Massachusetts? It’s a fair question, and one that doesn’t have a...
Modern Backyard ADU Ideas: Space-Saving Designs for Boston Homes
As housing costs continue to rise across Greater Boston, homeowners are becoming increasingly creative about how to use the space they already have. Backyard living solutions, once considered a niche idea, are now part of a serious, practical...
Backyard ADU vs. Home Addition: Which Is Right for Your Property?
If you're a homeowner in the Greater Boston area weighing an ADU or home addition, you're facing one of the most consequential decisions you can make about your property. Short answer: if you want independent, separate living space for aging...
How to Choose the Right ADU Floor Plan for Your Property
A Boston-Area Guide to Accessory Dwelling Unit Plans By Horizon ADU Choosing an Accessory Dwelling Unit (ADU) floor plan is one of the most exciting steps in creating more usable, flexible space on your property. Whether your goal is to support...
Trusted ADU Builders in Boston
Looking for experienced ADU builders in Boston? We specialize in designing and constructing high-quality detached accessory dwelling units (ADUs) that enhance your property’s value, increase your income potential, and meet your family’s evolving needs.