Why Do 30% of ADU Projects Fall Apart Before Construction Even Starts?

By Buz Artiano, BuildX | May 2026

Watch: 40% of Caregivers Pass First... Here's Why That Matters for Your Family

You've done the research and run some numbers. Maybe you've even picked out a floor plan. But then unfortunately your project comes to a halt, and it's not because of zoning, septic, or construction issues or costs. It's because your family is not all on the same page when it comes to the ADU. A couple weeks or maybe even a month go by and then someone calls to say the deal is off. If that sounds familiar, or if you are worried it could happen to you, you're not the only one.

My name is Buz Artiano, and I'm the founder and CEO of BuildX. We've built dozens of ADUs throughout 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, and we work with Massachusetts zoning regulations, septic constraints, and permitting requirements every day. After years of walking people through this process, we can tell you that the biggest variable in whether an ADU gets built has nothing to do with the lot, the budget, or the building department. It's about the family.

That's why we're going to shed some light on something that most builders will never admit. Around 30% of the families who come to us ready to build an ADU never make it to construction. The project falls apart before it even starts. This article talks about exactly why that happens and what you can do to make sure this doesn't happen to your family.

Why Do Most ADU Projects Fail Before They Start?

People have a tendency to think that a project will fail because of permitting delays, septic failures, or budget shortfalls, but in our experience at BuildX, most of the ADU projects that fall apart are because the family just can't seem to get on the same page with everything.

We've had families come into our office ready to put down a deposit. Everything looks right on paper and their lot, budget, and timeline all work great. And then we tell them the same thing we tell every single client, which is to go home and talk to your family about everything first. Two weeks later, they call back and tell us they just can't get on the same page and then the whole thing just fizzles out. Not because of anything we built or designed, but because they hadn't had a real discussion about it before making plans, or they did and they discovered underlying family issues that nobody wanted to deal with.

Building an ADU is 70% family dynamics and 30% construction. Erin Nunes, a managing partner at a Plymouth-based estate planning and elder law firm with over two decades of experience working with Massachusetts families, put it even more starkly in a recent conversation with us when she said it was more like 80/20.

What Family Issues Actually Kill ADU Projects?

The family dynamics that stop ADU projects fall into several categories, and most of them are interconnected. Understanding these before you start the process is very important if you don't want your project to be completely derailed.

Sibling disagreements about fairness. When parents decide to build an ADU on one child's property, all the numbers sort of change for everyone involved. If parents sell their home for $1,000,000 and put $400,000 into an ADU on (let's call her Mary)'s property, they've just added $400,000 of value to her estate. The ADU doesn't have a separate owner, it's just part of Mary's property now. That means the other two siblings (we'll call them Jane and Sally), are now essentially being given a smaller share of the parents estate. Even if the parents intended things to be fair, the numbers don't really support that. In order for all this to be manageable you have to have these conversations early, absolutely not after someone has already written a check or else things can go from inconvenient to full on crisis.

Ownership confusion. Most families don't realize that the person living in the ADU has no legal ownership of it. The ADU is part of the property it was built on, same as a shed or any other outbuilding. If your parents put their life savings into building an ADU in your backyard, they still don't own that ADU. Without the right legal structures in place, that can create huge family issues for everyone involved.

Divorce risk. Here's another one where huge problems can arise. Let's say Mary and Jack are married and Mary's parents sell their home and invest $400,000 to build an ADU on Mary and Jack's property. But then Mary and Jack get an unexpected divorce. What happens to the parents then? Basically, without the right legal planning, they are in serious trouble. Maybe their health has declined since they moved in and relocating them will be much harder. Plus, now their entire life savings that they used to pay for their home is now tangled up in a divorce settlement they have no control over.

Caregiver burden allocation. The child whose property the ADU is on ends up in a totally different position than the other siblings. Their day-to-day life actually changes. The parents are around all the time, coming and going, having people over, and at some point they're going to need more and more help. If the family hasn't talked through who's taking on that responsibility, and whether that child should be treated differently in the estate plan because of it, things can get tense pretty quickly.

Blended family complexity. We're currently working with a couple who were both previously married. Between them, there are seven kids from different marriages and all of them are different ages and at different points in their life. Every one of those children has their own ideas on what's fair and practical, and what the parents should do with their assets. The more people involved, the harder it is to get everybody on the same page.

Can These Family Issues Actually Be Solved Before They Wreck the Project?

Yes. Every one of these issues has a solution. If you want to succeed you have to deal with these things proactively, before any money is spent, before any permits are pulled, and before any construction begins.

For the sibling fairness question, estate planning attorneys can structure the parents' plan to account for the extra value that is being added to the child's property where the ADU is being built. That might mean giving retirement funds or other assets to the other siblings to offset the value the other child got from the ADU. Parents have the legal right to distribute their assets however they want, but the most important thing is to document the reasons so that the children can't have disagreements after the parents pass.

For ownership protection, families can create trusts that provide the parents with a right to live in the ADU for their lifetime. They can also include provisions that guarantee repayment of their investment if the property is ever sold, or have built in protections that give parents a certain amount of time to move out if the child whose property they ADU is on gets a divorce. Trusts were created for this specific type of scenario. They work, but they have to be in place before the ADU is built, not after.

To deal with divorce risk, everyone involved, including the spouse, can agree upfront to do the legal paperwork that will protect the parents' investment and make sure they're able to stay living in their home no matter what happens with the marriage. It's not exactly a fun conversation to have before you start building. But it's a whole lot worse to realize you should've had it after something goes wrong.

At BuildX, we tell every client the same thing before they sign a contract, and that is that in order to be successful in your ADU venture you have to have a team of three professionals working together from day one. You need a mortgage specialist, you need a good estate planning attorney, and you need a builder. They all need to be together in the room early to talk everything out, because their decisions all affect each other. We've seen families try to deal with all the legal and financial stuff after construction has already started, and that's what causes projects to fall apart. The people who get their whole team together at the beginning are the ones who make it to move-in day.

What Does It Cost to Get the Legal Planning Right?

One of the reasons families skip estate planning is because they assume it's ridiculously expensive, but it's really not. We've talked to a lot of Massachusetts estate planning firms, and foundational estate planning documents for a single person are only around $1,500, and $3,100 for a married couple. For families whose situation and needs are more complicated and they need trust planning, ADU-specific provisions, and multi-beneficiary structures, the total ends up being in the $3,000 to $10,000 range.

Compare that to the cost of the ADU itself, which in Massachusetts is around $250,000 to $400,000 or more for a fully completed, move-in ready unit. Spending $5,000 to $10,000 to protect a $300,000 investment isn't really an expense, think of it as paying insurance, because that's what you're doing. It's not like a homeowner insurance policy, it actually protects against the family risks that end up derailing a lot of ADU projects.

A lot of estate planning firms will give you a free initial consultation usually up to 90 minutes. By the end of that meeting, they can typically outline what planning is appropriate and what it will cost, so there's no reason for you to guess.

Is Building an ADU the Right Decision for Every Family?

No. And that's coming from a builder who wants to build your ADU. The truth is, some families are not in a position to move forward with such a big project, and forcing it only creates more issues than it solves. If siblings are in disagreement over inheritance, if a marriage is getting rocky, or if the primary caregiver is not sure they want to make such a big commitment as having parents in the backyard, an ADU may not be the right solution right now.

We would rather someone take six months to work through all the family and legal issues and come back to us when everyone is in agreement than to rush into a project that falls apart at the deposit stage, or worse, halfway through construction. We've seen both things happen. The families who take the time to get settled and in agreement build better projects, make better decisions, and are happier with the result.

If you're reading this and recognizing some of these dynamics in your own family, that is a good sign. It means you are doing the hard work of asking the right questions before you commit, which is exactly what you should be doing.

What Separates the Families Who Actually Get Their ADU Built?

After watching hundreds of families go through this process, we've noticed a pattern. The families who are successful in their ADU endeavor are the ones who do these three things.

First, they have the hard conversations early. They talk about ownership, inheritance, caregiving expectations, and worst-case scenarios before anyone picks out kitchen cabinets. Those conversations are uncomfortable, but they're the foundation of every successful ADU project we have ever built.

Second, they get their team together before they need it. The mortgage specialist, the estate planning attorney, and the builder are all involved from the first conversation. When those three parts of the team are all together, the family gets clear answers on all their questions and there's no conflicting advice.

Third, they understand that the ADU building process is emotional, not just logistical. Building an ADU means changing the way a family lives together. It changes everything, property lines, inheritance, daily routines, and long-term caregiving. When families acknowledge that instead of pretending it's not a thing, they are able to build something that actually works for everyone involved.

Your Family's ADU Starts with a Conversation, Not a Blueprint

Thirty percent of ADU projects collapse before construction even gets going because the family work was never done. The permitting, the septic, the foundation, the framing, all of that is the easy part. The real question is whether your family is all on the same page when it comes to the decisions, and do they have the right legal protections in place, and are they supported by professionals who understand what this process actually requires.

If you are ready to find out whether an ADU is the right move for your family, we are ready to have that conversation.