What Is the Massachusetts HMLP Loan and Can It Help Pay for Your ADU?

By Buz Artiano, BuildX | July 2026

Watch: How Much Does It Really Cost to Build an ADU in Massachusetts, The BuildX Way

When you're living on a fixed income, the word "loan" can immediately scare you off when it comes to an ADU. All you can think about is the fact that you'll have a new monthly payment in addition to all your other bills and you're not sure you can afford that. For a lot of the families who come to us wanting to build an ADU for their parents, or wanting to stay in their own home as they get older, the fear of adding a new monthly payment to their budget is the whole reason they assume an ADU isn't an option for them.

My name is Buz Artiano, founder of BuildX. We've built dozens of accessory dwelling units across Massachusetts, mostly around the South Shore. We handle design, permitting, and construction and everything else ourselves, which means we spend a lot of time on things that most builders don't really deal with, including the state programs that decide whether an ADU is affordable in the first place. And there's one program that surprises most people we talk to about it.

The Home Modification Loan Program, or HMLP, is one of the few bits of state money that doesn't add an extra monthly payment. It is a loan, but it works nothing like the scary loans you're thinking of. Here's exactly how it works.

Can HMLP Actually Pay for Your ADU?

Yes. Massachusetts lists ADUs as an eligible use of the Home Modification Loan Program. Other things that qualify are ramps, stair-lifts, and accessible bathroom upgrades. The program can give you a zero-interest loan of up to $50,000 toward any of that work. You can see all the details and current terms at mass.gov.

That $50,000 isn't going to cover an entire ADU. It's just an extra source of money that goes along with your home equity or other financing. What makes it worth understanding is the structure of the loan itself, because it gets rid of the biggest risk: a new monthly payment.

Why a No-Payment, No-Interest Loan Changes the Affordability Math

Most loans cost you money in two ways. You pay the money back, and you pay interest for the privilege of borrowing it. HMLP does neither of those every month. It's a deferred-payment loan, which means you don't make monthly payments. And it has no interest, so the balance never grows.

You repay the loan only when you sell or transfer the property. Until that day, the loan doesn't require any kind of payment. Borrow $50,000, stay for 30 years, and you still repay only exactly that $50,000, the balance never goes up. Because it never accrues interest and never requires a payment, the longer you stay, the less that fixed amount cost. For a household budgeting around Social Security or a pension, that actually matters more than the dollar figure. It puts state money into your project without changing your monthly budget at all.

Who Qualifies for HMLP in Massachusetts?

HMLP is built for people who want to stay independent at home, so its eligibility rules are based on disability and age. As of July 2026, the program is open to Massachusetts residents who meet certain criteria. First, you have a disability, or a household member has a disability, or a household member is over 60. Next you can provide documentation of need; and you meet the program's income-based requirements. You can see the details on the income thresholds and documentation rules at mass.gov before you count on getting the money.

Two details trip people up. First, the disability or age requirement applies to anybody in the household. A household that includes an aging parent or an adult child with a disability can qualify on that person's behalf. Second, there is an income test, so the program is aimed at low-income and moderate-income households rather than every homeowner. If your income is above a certain amount, you won't qualify for the program, and it's better to know that early.

What Else Can HMLP Pay For Besides an ADU?

An ADU is one eligible use, but the program is meant for more than just that. It exists to make a home work for someone who wants to age in place or live with a disability. It can cover ramps, stair-lifts and platform lifts, bathroom and kitchen modifications, and other accessibility work. If a family wants to stay in the house they already have and needs to rebuild a bathroom or add a ramp for an aging parent, that money can be used for that too. The whole point of the program is keeping people in their homes as long as possible.

But you need to know what it doesn't apply to as well. HMLP doesn't cover window replacement, roof work, heating systems, or septic repair. Those are ordinary maintenance and system costs, and this money is reserved for accessibility and independence. If you need a new roof in addition to accessibility modification, only the accessibility stuff would be covered.

The Real Catch Is the Paperwork

The program is generous. The application is where families stall. There's a lot of documentation involved, from proving eligibility to describing the work that has to be done. For a household already managing a parent's care or their own health, having to fill out a stack of forms and hunt down paperwork is why a lot of people never follow through with the process and don't get the money.

This is where doing design, permitting, and construction ourselves pays off. We've walked enough people through this to know what paperwork slows the process down and how to describe the work the way the program wants to see it, so the application moves forward instead of being ignored for six months or indefinitely. We handle the paperwork side with you, we're not just going to hand you a folder and wish you luck. The people who run the program are genuinely helpful, and the state liked the results so much that they filmed one of our completed ADUs for their own outreach about what the money makes possible.

Is HMLP the Right Move for Every Family?

No, and we would rather tell you that now than after you've counted on it in your plans. Three limits decide the fit. The income requirements rule out anybody who's above the line, so plenty of families will not qualify just based on that no matter how much the program would help them. The loan is a lien on the home that gets repaid when you sell, so it lowers what you walk away with after the sale. And up to $50,000 is only part of an ADU, not the whole thing, which means you still need a financing plan for the rest of the cost.

For the households it fits, a fixed-income family adding a unit for a parent, or a homeowner building in accessibility features so they don't have to move, HMLP is close to the best money in the market because it's state funds, no interest, no monthly payment. For everyone else, it is one tool to weigh against the others, not the answer all by itself.

Where to Start If HMLP Might Fit Your Family

The fastest way to know whether this program belongs in your plan is to check two things at once: whether your household clears the eligibility and income rules, and how a $50,000 loan fits against the rest of your ADU budget. Those two answers turn a flat "we can't afford it" into a real number you can actually decide on.

That is the conversation we start with families who look like a fit for this program, and it begins with your situation, not a sales pitch.