What Happens to the ADU If You Get Divorced in Massachusetts?

By Buz Artiano, BuildX | April 2026

Watch: Elder Law Secrets, Special Needs Trusts & Condo-izing ADUs: Patrick Kelleher | BuildX Podcast #31

You've been planning an ADU for your parents for months, the design is all done, and you've got the financing. But then someone in the family asks kind of a difficult question. What happens to Mom and Dad's ADU if you and your spouse split up? That one thing has stopped more ADU projects than septic failures and zoning denials put together.

My name is Buz Artiano, and I'm the founder and CEO of BuildX. We've built dozens of ADUs across Massachusetts, mostly around the South Shore and Plymouth County. We handle design, permitting, and construction under one roof, and that means we've seen this conversation happen many times. Families come to us and they're excited about building, and then everything stops when they realize the ADU sits on property that could be forced to be divided up in a divorce. We work within Massachusetts zoning regulations, septic constraints, and by-right permitting rules every day, and we've learned that the legal structure around an ADU is just as important as the foundation we pour.

The thought of divorce doesn't have to be the reason your family abandons an ADU project. There are specific legal tools out there that protect your parents' home and investment, and as long as you talk to an attorney and put those protections into place, you will be able to move forward with your project with confidence.

What Happens to the ADU in a Massachusetts Divorce?

When a married couple divorces in Massachusetts, the court divides all marital property equally. That doesn't always mean everything is split up 50/50. It means the court considers the length of the marriage, what each person contributed, and the individual situations of both people when deciding who gets what.

An ADU that's built on property owned by the married couple is part of their joint estate. The court can order them to sell the property, including the ADU, and divide up the money. If your parents are living in the ADU, they won't automatically get to stay there, they could be forced to move as well. The ADU is part of the land, and the land becomes part of the divorce.

Thinking about this definitely keeps some people up at night. A parent invests $300,000 to $400,000 to build a home on their child's property, and a divorce filing two years later could mean that the whole investment is lost when the property is sold and it's split between the spouses. Without legal paperwork in place, the parents' home and their investment are at risk.

How Does a Lease for Life Protect Your Parents?

A lease for life is a legal contract that gives your parents the right to live in the ADU for the rest of their lives, no matter who buys the property or how many times it changes hands. A life lease isn't a verbal agreement. It's a recorded legal document that gives the parents rights.

When a lease for life is recorded at the registry of deeds, it will cause the property owner's rights to be limited and that is called an encumbrance. That encumbrance will show up in any title search. If a divorce court decides the property must be sold, any buyer interested in the property will see that the elderly parents have a legal right to stay in the ADU. As a practical matter, no buyer is going to buy a property that has a legal lifetime lease attached to it. This restriction means that even in the event of a forced sale, the family member living in the ADU isn't likely to have to move.

The lease for life has to be written up by an attorney who understands both Massachusetts real estate law and elder law. It needs to be very specific about the ADU being the structure that's being rented, and it needs to say who will be living there, and who is responsible for what maintenance. A generic lease template won't hold up in court if there are ever any issues.

What Does a Promissory Note Do for ADU Protection?

A promissory note is a different legal document that kind of works with the lease for life. It documents the amount of money your parents contributed to the ADU and places a lien on the property for that amount.

Here's how that works in real life. Your parents put in $400,000 toward the construction of the ADU. An attorney creates a promissory note for that exact amount, with no interest and no payments, and puts an official lien on the property. If the property is ever sold, whether through divorce or otherwise, that $400,000 has to be paid back to the parents before the rest of the money from the sale is divided up between the spouses.

The promissory note doesn't keep the property from being sold, it just makes sure that your parents' investment is repaid when the home is sold before the rest is divided up. If the home sells for $1,200,000 and your parents hold a $400,000 lien, that $400,000 comes off the top. The $800,000 that's left is what the court divides up between the spouses.

We see this all the time in pre-construction planning conversations. When families come to us and the adult child is married, we always talk about the legalities before we start construction. The families who get with an elder law attorney and record a lease for life and promissory note before construction starts will be able to move forward without any worries. But when they skip this step because they feel it's unnecessary, they always call us later wishing they'd done things differently. In our experience building tons of these ADUs, the legal planning conversation takes just a few hours and it costs only a very small part of the ADU budget. It is the cheapest way to protect your family and their assets.

Why Do These Protections Need to Be in Place Before Construction?

It's possible that you could record a lease for life and a promissory note after the ADU is finished, but it creates complications. If a divorce has already started, a court may see that you recently recorded that lien as a way to get around the equitable distribution.

The best position to be in is when protections and documents were established before breaking ground. When a lease for life and promissory note are recorded at the same time the construction loan was taken out, then those two things just become part of the property's history from day one. Nobody can argue that they were put in place to manipulate the courts.

This is why we tell everybody to talk to an elder law attorney during the design phase, before the ADU is finished. The cost of that consultation is usually a few thousand dollars. But the cost of trying to fix property disputes after the fact can be ten times higher.

What Happens If No Legal Protections Are in Place?

If your parents helped pay for the ADU, but they have no lease for life and no promissory note, they're much more vulnerable if there's a divorce. The court will consider the financial contributions of both spouses, and the money the parents put into the ADU could be treated as a gift to the married couple and not an asset that can be recovered.

If that happens, the parents would need to argue in court that their contribution was a loan, not a gift, and that they should be reimbursed. Without written documentation, that argument will depend on testimony and circumstantial evidence. The courts want a written agreement.

It's very possible that your parents could lose both their housing and the money they put into it. If the property sells and the money gets split up between the divorcing spouses, your parents could be left with absolutely nothing. They would need to find alternative housing with whatever money they have left. For parents in their 70s or 80s, that's not a small problem, it's a disaster.

Does the ADU Change How Other Marital Assets Are Divided?

Yes. An ADU changes the total value of the marital estate, which affects how everything gets divided up. If the home was worth $800,000 before the ADU and it's worth $1,200,000 after the ADU is built, the court has to divide a bigger estate. That can affect how they divide out the retirement accounts, investment accounts, and other property.

This is another reason the promissory note matters. If the $400,000 ADU investment is documented as a lien held by the parents, that amount is subtracted from the value of the property before it's divided up. The divorcing spouses divide $800,000 in equity rather than $1,200,000. The promissory note keeps the ADU investment completely separate from the combined marital estate.

Is This Level of Legal Planning Always Necessary?

No. If your parents are building an ADU on their own property, and the property isn't co-owned with a married child, you don't need protection against divorce. If the ADU is being built by a couple for their own use, they only need standard estate planning, such as a revocable trust, a will, and named beneficiaries.

The lease for life and promissory note conversation is for families where parents are building on property owned by a married child. That's when a divorce creates the most risk. If your family situation doesn't match that description, you don't need to bother with the tools we discussed.

We also want to make sure we're clear that we are not attorneys and we are not qualified to give legal advice. BuildX builds ADUs. What we do is pay close attention to the scenarios we've seen happen repeatedly and we connect families with elder law attorneys who specialize in these situations. The legal advice comes from the attorney. Our job is just to make sure the conversation happens before we start the construction.

Protect the Investment Before You Pour the Foundation

Divorce isn't a good reason to avoid building an ADU for your parents. Just make sure you have all the right legal protections in place before you start building. A lease for life and a promissory note are simple legal tools that an elder law attorney can draw up for you in a couple of weeks. Once recorded, they protect your parents' housing and their financial contribution regardless of what happens to the marriage.

The families who build with confidence are the ones who deal with all the legal stuff early, get the protections in writing, and then move forward once they know the investment is secure.