Has Anyone Actually Sold an ADU as a Condo in Massachusetts? (Inside the First Westfield Sale)

By Buz Artiano, BuildX | July 2026

Watch: The ADU Loophole Massachusetts Builders Are Just Now Figuring Out

Every time you read something about selling an ADU separately as a condo, it basically says the same thing. The law says that you can condominium-ize an ADU and sell it as a separate property with its own deed. Yes, the law technically allows it, but then the issue is that you're kind of the guinea pig who has to spend two or three hundred thousand dollars on a structure that you plan on selling off separately when it's never actually been done before. If you've heard that condo-izing is possible and you're quietly waiting for proof that someone has done it, you definitely want to find that out before you build.

My name is Buz Artiano, founder of BuildX. We've built dozens of ADUs all over Massachusetts, but most of our projects have been around the South Shore and southeastern Massachusetts, where the lots, the septic rules, and the local zoning are all different in every town. We handle the design, permitting, and construction ourselves, which means that every day we have to deal with ADU approvals, limits on lot-coverage, and septic issues. We meet 25 to 40 potential ADU clients a week, and more than 500 families have walked through our home tour since January. That experience is why we can tell you when a strategy is real and possible, and when it's still kind of an unknown.

Most discussions about condo-ized ADUs come to an end with the whole legal part of the conversation. The Westfield deal didn't stop, because it actually happened. On a recent episode we sat down with Rob Levesque, a land-use consultant with more than 25 years structuring projects like this, whose firm has condo-ized ADUs that are in the closing process right now. One of them was already built, divided, listed, and put under agreement. The legal ground under it is solid in the places that matter and still developing in others, and you have to know the difference so you make a smart move and not just a very expensive assumption.

Has Anyone Actually Condo-ized and Sold an ADU in Massachusetts?

Yes, there is an example right in Westfield. Rob Levesque's firm took a two-family property, added a detached ADU by right in the side yard, and then divided the ownership of the single lot into two condominium units. As of July 2026, that ADU had gone on the market at $349,000 and had an accepted offer with a purchase and sale agreement, the contract that comes right before closing, working its way through the attorneys. The sale hadn't closed at the time we spoke, so the final price is not public record yet, and we are reporting the numbers as Rob and his attorney memos describe it, it's not a completed sale just yet.

What makes this a big deal is that it's a real listing with a real buyer. For a market that has spent two years asking whether you can even do this, a built unit under agreement is a different kind of answer. It moves the question from whether the structure is legal to whether it will work on your specific lot, which is a much better problem to have.

How Do You Split One Lot Into Two Sellable Units?

The property never gets physically subdivided, that's where people get confused. In the Westfield deal, the lot stayed a single common lot, and the ownership was divided instead of the land. Rob's firm created what is called an exclusive-use area for each unit. The primary home has exclusive use of its part of the lot, the ADU has exclusive use of its part, and both areas are written into the master deed, which is the document that gets recorded along with a site condominium plan and unit plans.

The idea is to set up as a side-by-side two-family housing unit, sometimes called a condex, with a line that goes down the middle. Each side has its own unit and its own yard, but it's all technically on the same lot. The only difference is that the two units are detached buildings rather than one building split in half like a duplex. On the Westfield lot, the ADU we built was a two-bedroom unit with a living area, a garage, and a small patio, and a six-foot fence along the line that separates the two areas so each home feels like its own property.

The fence is important, but the main thing is that we run separate water, sewer, and utility connections to it even though it shares the lot. When each unit has its own service, its own meter, and its own bill, it's considered an independent home, which means you can finance it through a bank and the buyer owns it independently without having to share utilities with a neighbor they're not related to. The condominium documents make the two homes legally separate. You need that and separate utilities in order to sell it.

Does the Town Have to Approve Condo-izing Your ADU?

No, and the reason comes down to a distinction most people aren't familiar with. Zoning controls use. An ADU is an accessory use to the primary home, and that's what the town regulates when it approves the unit. Ownership is a totally separate thing, governed by the Massachusetts Condominium Act, Chapter 183A. According to Rob, creating a condominium involves no local approval process, because a town's zoning authority has nothing to do with how the property is owned. You can look at the actual statute at malegislature.gov. The state has made no changes to Chapter 183A that would affect this, and in Rob's professional opinion a town's zoning board can't restrict ownership.

This is where attribution matters, so let's be very clear. Some towns comment on the idea or try to discourage it, and older ADU zoning language in a lot of towns was written to restrict these units. But Rob's attorneys have taken the position that zoning has nothing to do with ownership, and it's the basis that the Westfield unit was structured and listed on. The Massachusetts Attorney General's office addressed the question on its guidance page and referred back to state condominium law rather than giving towns a role. The underlying ADU itself is still built by right under the state's ADU law, which you can read at mass.gov, and the town's building, health, and size requirements still apply. But there isn't a separate step for the condominium itself.

What Does an ADU Condo Actually Sell For?

In order for the price to make sense, you have to understand what you're buying. On a condo like this, the land is already paid for, because the owner isn't buying a new lot, they're just dividing the one they already have. The structure is a new, two-bedroom home. The garage doesn't count toward the unit's gross floor area, and on the Westfield lot the basement ceiling was too low to count as living space, so it didn't add to the countable area either. The biggest unknown as far as cost on a project like this are the build itself and the site work for the separate utilities, which can add quite a bit of money depending on how far services have to be run and how cooperative the local departments are.

The Westfield ADU listed at $349,000. That price is for a single family home on a shared lot, and as we had talked about, you can't buy a new standalone single-family house for $350,000 anywhere in this market right now. That's kind of the point of this whole thing. A condo-ized ADU is not priced like a rental add-on. It's priced like the small, new, independent home that it is. For someone who is trying to decide whether the ADU will hold resale value, the Westfield listing clearly shows that the market treats it as a real home with a real price.

When Does Condo-izing an ADU Not Make Sense?

We structure and build these units, so a lot of people think that we will just tell every family to condo-ize. But that's definitely not true, because it's not the right move for everyone. If your goal is to keep a parent or an adult child close and you never intend to sell the unit, a full condominium conversion adds cost and a whole bunch of unnecessary legal complications you don't need. A family trust or a simpler ownership arrangement can accomplish what you want, and the six estate attorneys we have hosted on our podcast each have a different structure for that reason. The ADU journey is mostly about family dynamics and only partly about what gets built.

Condo-izing also depends on a lot that can support an ADU in the first place. If your property can't fit the unit within the setbacks, or if your town requires site-plan review, the process is a little different and it can take longer. And it is worth repeating what Rob himself says, which is that everybody should check with their own attorney. This is a very new process. The Westfield sale was under agreement, not closed, when we discussed it, and a lot of towns are still uncomfortable with the whole thing. If you're pressure-testing whether this strategy is real before you spend the money, the honest answer is that it is real and it is documented, but it's also new enough that you must get your own legal advice on the matter.

How Do You Find Out If Your Lot Can Do This?

The Westfield transaction answers the question this article set out to answer. Condo-izing an ADU and selling it separately is no longer a legal theory in Massachusetts. It has been built, divided, listed at $349,000, and put under agreement, on the strength of the distinction between zoning, which controls use, and ownership, which is governed by state condominium law. What it is not is a guarantee that the same structure fits your property or your family's goals. The only way to know that is to look at your specific lot.