Do You Need Your Own Attorney When Building an ADU With Family?

By Buz Artiano, BuildX | June 2026

Watch: ADUs, Nursing Homes & Inheritance: What Families Get Wrong | Atty. Brian Barreira

When a family decides to build an ADU together, the first things they usually talk about are floor plans, budgets, and timelines. Most people don't think about whether the parents and the adult children should have separate estate planning attorneys. Most people assume that one family lawyer can handle everything, but that can create problems. Parents and children have different financial interests, there are different risks involved for everyone, and different legal consequences if things go wrong. And ignoring this doesn't make it go away.

My name is Buz Artiano, and I started BuildX. Since then we've built dozens of ADUs all over Massachusetts, but most of our builds have been around the South Shore and Plymouth County areas. We handle all the design, permitting, and construction ourselves, which means we see every stage of the process, including the legal conversations that happen prior to construction. After working with families navigating septic constraints, lot coverage limits, and local zoning requirements, we've learned that 70 percent of any ADU project is family dynamics, and 30 percent is what you actually build. The legal structure you choose before construction will have a dramatic effect on everything that comes after.

We're going to explain why parents and adult children need separate legal representation when planning a family ADU. We'll also talk about what happens when they do not have it and how to think about this step as the foundation of a project that protects everyone.

Why Do Parents and Children Need Separate Lawyers for an ADU?

It's very simple. Parents and children have different financial interests in a family ADU arrangement, and a single attorney can't represent both sides without a conflict of interest.

We'll give you an example of a pretty common scenario. Parents are investing $400,000 to build an ADU on their child's property. The parents need to protect their investment, make sure they always have a place to live, and structure things in such a way that they don't trigger that five-year Medicaid look-back if a nursing home becomes necessary. The adult child, meanwhile, has a mortgage on the property that could be affected by adding parents to the deed. If the child ever ends up getting divorced, the ADU investment becomes part of the marital property dispute. And if the parents pass away, the grandchildren could be unintentionally disinherited.

These types of situations aren't hypothetical, they happen all the time. But they are very standard risks that an experienced elder law attorney deals with every day. The parent's lawyer will advocate to protect the parents' share of the property's equity and help keep them protected from nursing home claims. The child's lawyer will deal with the effects the arrangement will have on the mortgage and their estate in general. Those are conflicting interests and cannot be represented by the same attorney.

What Goes Wrong When One Lawyer Represents the Whole Family?

What happens most often is that one side's interests are treated like they are less important than the other's. A family attorney who has represented the parents for years may just try to protect the parents' equity without explaining to the child how adding a parent to the deed affects their mortgage, their spouse's rights, or the grandchildren's inheritance.

The child's spouse is usually the one most at risk in these types of arrangements. If the couple ends up getting divorced, the spouse who gets the house in a settlement could inherit a property with a parent on the deed, or a lien from the ADU investment, or even a life estate that restricts what they can do with the property. Without independent legal counsel explaining all of this before the deed is signed, the child's family walks into an arrangement they really don't fully understand.

On the other hand, parents who rely on the child's attorney may not get the right advice about the Medicaid look-back implications of gifting money versus receiving equity in return for their money. Under Massachusetts MassHealth rules, a transfer for value is not treated as a gift, which means parents who receive an ownership interest that's equal to their investment can avoid triggering the five-year look-back period. But a parent's attorney, not the child's, is the one whose job it is to ensure that protection is put in place the right way. You can review current MassHealth eligibility details at mass.gov.

What Should Each Attorney Be Reviewing?

The parent's attorney and the child's attorney should each be evaluating what's best for their client. While the specifics can be very different depending on the family, all the reasons for concern can usually be divided into just a few categories.

When Should You Engage Separate Counsel in the ADU Process?

You have to have legal conversation before construction starts. At BuildX, we've had families come to us ready to start building, only to find out that the way they did the deed is actually going to cause problems later that they hadn't thought of. The investment discussion, the deed work, and the legal review should all be done before we even quote a project, because the ownership structure can affect absolutely everything down the line.

We recommend that everybody consult an attorney before doing anything else. That means before picking out a floor plan or getting a site evaluation or applying for financing. That's because if the parents are contributing $400,000 and expecting to go on the deed as joint tenants, the attorney might decide that a life estate or a lien structure is more appropriate given the family's specific set of circumstances. That decision can affect the ADU's size, location on the lot, and even whether a detached unit or an attached addition is the best choice. We've had projects where the legal conversation changed everything about what we built, and the families were better off because they had that conversation early rather than finding out there were major issues once they were already building.

The order that works best in our experience is: legal consultation with separate attorneys, then deed work and financial structuring. After that comes design and permitting, followed by construction. When people do things in the opposite order, which is very common, they create issues that are very expensive to fix later.

Is Hiring Two Attorneys More Expensive Than Hiring One?

Yes, hiring two attorneys definitely costs more than just hiring one. But the upfront legal fee isn't the main issue. You have to think about the cost of untangling a poorly structured arrangement after construction is complete, after a parent enters a nursing home, or after a divorce puts everything at risk.

If you want your project to go smoothly, you have to treat legal planning as a line item in the overall ADU budget, not as an extra expense. An elder law attorney who understands ADU family dynamics and a real estate attorney who understands the child's mortgage and marital exposure together cost a small fraction of what a single divorce proceeding would cost.

When looking for the right attorneys, what you want to look for is someone who has experience with family property transfers and elder law in Massachusetts. Not every real estate attorney understands Medicaid look-back rules, and not every elder law attorney understands how ADU deed structures interact with local zoning. The attorney Buz recommends families start with is someone who understands the intersection of those two areas, because that's where it gets the most complicated.

Is Separate Legal Representation Always Necessary?

Not every family ADU project gets very legally complicated. If both parents are healthy, the marriage is considered stable, there are no other siblings, and the financial contribution is modest relative to the property value, it's much simpler and carries less risks. Some families might be just fine with a single consultation with an elder law attorney, combined with a separate real estate review for the child. That can provide enough protection without the cost of hiring two lawyers.

BuildX is a construction company, not a law firm. We cannot and do not advise families on which legal structure is right for their situation. What we can do, and what we do all the time, is flag these questions early in the process so there are no surprises later. If separate representation feels like overkill, that's a conversation to have with your attorney, not your builder. But having the conversation is the part that matters.

Your ADU Starts with the Right Conversations, Not the Right Floor Plan

The families who have the best outcomes with their ADU projects are the ones who get the legal structure right before starting the construction process. Separate legal representation ensures that everybody's interests are evaluated, every risk is dealt with, and the deed work is what the family actually agreed to. That foundation makes every conversation that follows, from design to permitting to construction, simpler and safer for everyone involved.