What Causes ADU Construction Delays in Massachusetts?

By Buz Artiano, BuildX | February 2026

After building over a hundred ADUs throughout Massachusetts, we've seen everything that can delay a project. From boulders the size of pickup trucks buried in backyards to contractors who took deposits and then disappeared. We've learned that most of the things that can cause a project to stall can be prevented with the right planning. At BuildX, we've made it our mission to understand what causes delays so we can protect our clients from having to go through all of that frustration.

We understand why you're concerned about delays. You could be building the ADU for an elderly parent who really needs to move in as soon as possible. Sometimes people have financial commitments based on the ADU being completed by a certain date. We don't want you feeling that anxiety comes from indefinite delays and increasing costs. Nobody should have to go through that.

That's why BuildX offers a 100-day build guarantee on every Massachusetts ADU we build. The day we break ground our time starts. We have enough experience now to understand what causes most delays and we've developed strategies that allow us to make that promise. In this article we will share that knowledge with you so you can spot the warning signs before you sign a contract.

What Are the Two Main Reasons Your ADU Project Could Go Off Track?

Based on our experience building dozens of ADUs in Massachusetts, construction delays fall into two main categories: contractor financial problems and inadequate planning. Everything else, including weather, back orders on materials, and site surprises, can all be managed when the planning is thorough.

The first issue is when a contractor is already out of business but doesn't realize it. They take your deposit and use that money to pay for the last job that they underbid. This little game goes on until someone gets left holding the bag. If your contractor asks for $50,000 or $100,000 upfront, or needs payment every two weeks regardless of whether the work is completed or not, that's a huge red flag. Our deposits at BuildX run between $20,000 and $25,000, and then you pay for work after it's finished and inspected.

The second issue is starting construction without making sure you have done all the proper planning, you have all the specifications, and all your selections are finalized. Projects can go very bad when they start with rough sketches and vague agreements. The builder will sometimes say that something didn't quite work the way they thought it was going to, or they claim you had upgrades that were "extra." The whole project turns into some kind of Frankenstein ADU that looks nothing like what you imagined, and you're way over budget.

Why Is Site Work the Biggest Wild Card for Your Timeline?

We have to understand your site early in the process, especially your septic system. Septic is by far the biggest variability in ADU projects. Septic is everything. It makes the cost go way up or down depending on the age of your system, your site conditions, your soil conditions, and the depth of the water table.

If you are on well water and septic, you could be limited to however many bedrooms the property will support. We've seen projects where they discovered halfway through that their septic system couldn't handle the extra flow for the ADU. That conversation needs to happen day one, not after the foundation is poured.

Underground surprises are unpredictable by nature. We've dug thousands of holes in Massachusetts and you never know what you will pull out of the ground. We have found horse bones, cow bones, vehicles, dump trucks, and oil drums. On one of our projects, we uncovered a boulder in the ground that was 14 feet long, 7 feet wide, and 6 feet tall, right where the foundation needed to go. We have a name for those, we call them "hoobies," which just means boulders that are too huge to pick up. You have to bust them up with expansive concrete, and doing that adds a lot of time and money.

How Does Permitting Cause Delays in Your ADU Project?

The secret to good permitting is studying the town's requirements and meeting with officials ahead of time. That means the building inspector, zoning officer, and Board of Health. You show them your site plan and preliminary set of plans. You always have the permitting conversation before submitting everything, don't wait until after.

From the very start you can expect 90 to 120 days to get to a permit. That includes surveyor work, perc tests, design finalization, and approving a budget. Rushing this phase is a huge mistake, but construction projects still do it all the time. People are anxious to get going, so they pull the permit and start building, only to find out later that they should have gotten answers to a lot of very important questions first.

Timelines for permits are very different depending on what town in Massachusetts you live in. You can wait months in Scituate, but then maybe a week in Hanover, and somewhere in between in Marshfield. A lot of towns are still trying to adjust to the new ADU laws under the Affordable Homes Act that made ADUs allowed by right for the entire state. Some towns that required special permits don't want to give up that control, even though ADUs are now a right. Several towns are facing issues with the Attorney General's office and they are having to go in and change their local bylaws.

What Happens If You Have Wetlands on Your Property?

If you have wetlands, you need to deal with them right away. There's no way to skirt around the issue or somehow stay under the radar. You have to start by hiring a professional surveyor and a botanist to flag the wetlands. Then you submit to the Conservation Commission to get the wetland line approved so you know exactly where you can build.

Conservation Commission approval takes time. Once they close the hearing and vote on your Notice of Intent, you still have to wait about two weeks for the official approval. Then you have to file at the registry, which goes to the town clerk. From the moment they say yes, it is still 30 or more days before you can actually do anything. There's absolutely no way around this in Massachusetts.

Can Weather and Neighbors Cause Construction Shutdowns?

Weather is always a factor, but for the most part it's manageable. We actually prefer winter construction because frozen ground is easier to work with than mud. When we set the ADU, we stay all day to make sure we get the structure weather tight. Also we use huge tarps at night to protect the work.

If you've got really steep slopes on your property, sometimes we have to wait until April when the ground is workable. Cold weather concrete pours need special handling. But we can plan for all this once we see your property.

Neighbors actually can shut you down. Technically, working hours are 7 AM to 5 PM in most Massachusetts towns. A neighbor who calls the police can force us to stop at 5PM, and it doesn't matter if you're in the middle of something really important. We've been shut down before. That's why it's so important to maintain good relationships with your neighbors during the project.

Do Material Lead Times Still Cause Problems?

Material delays have improved since the pandemic threw our supply chains into chaos, but they're not perfect. Windows right now are taking about 5 to 7 weeks from order to delivery, as long as you don't have specialty items. That's very manageable if you order early in the design process.

The trick is to always finalize selections before you break ground. When your choices aren't set, you end up waiting for materials in the middle of construction. That's just wasted time where workers can't keep working. A well-managed project orders materials based on a schedule, so items arrive just before they are needed.

Are Some Delays Outside Anyone's Control?

Absolutely. No builder, including us, can control everything. We can't rush the surveyor or the permit process. We also have no way of knowing what's buried underground or how fast your town's Conservation Commission meets. If your property has ledge, a long driveway, or a complicated septic system, the timeline will go beyond the standard 100 days.

The difference is communication. We tell you upfront if your project will take 120 days or 130 days, and we tell you why. There will never be surprises after we have already started construction. The most we have ever exceeded our 100 day estimate so far was by 15 days, and that was because it was a very difficult property. If you need your ADU built faster than the site conditions will allow us to do, or if you prefer a different approach, we will have that discussion with you and be honest about whether BuildX is the right fit for your situation.

Why Is Lack of Communication the Number One Complaint?

When we talk to homeowners who have worked with other contractors, they don't usually complain about increasing cost or issues with the quality of work. The main complaint is not knowing when workers will show up or if they will show up at all. Lack of communication means that small delays that could be easily managed become a complete nightmare.

We give every one of our clients access to our project management software, called Job Tread. You get an owner's portal with the live job schedule. As weather delays happen or there are other changes, you see the schedule update in real time in the app. You can also see your contract values and what you have paid so far. Making all of this information easily accessible to you gets rid of the guessing and the anxiety.

What Should You Expect for Total Project Duration?

From the very beginning, when you have no surveys, no design, and no permits, you can expect 9 months to a year before someone can move in. That includes the pre-construction phase (surveys, design, permitting) which takes 90 to 120 days, followed by our 100-day construction guarantee.

If you are building for an elderly family member, you don't want to wait. The pre-construction process alone takes at least six weeks before a surveyor even visits your site. Then comes design, budgeting, and permitting. Starting the conversation early gives you options. Waiting until someone needs to move in means you don't have those options and your only choice is to rush through the process.

Ready to Build Without the Uncertainty?

ADU construction delays don't always have to happen. They happen when contractors are financially unstable, when planning is not done right, and when communication is lacking. The right builder identifies site challenges early, creates a realistic timeline, and keeps you informed throughout the process.