How Long Does It Take to Build an ADU in Connecticut?
How Long Does It Take to Build an ADU in Connecticut?
Planning an accessory dwelling unit for a parent, adult child, or extended family starts with a realistic timeline. Here is how long an ADU typically takes to build in Wolcott, Waterbury, and surrounding Connecticut towns, and what happens at each stage.
Typical ADU Construction Timeline
An average ADU of about 650 square feet takes six to eight months to build, from foundation to move in. Permitting happens before construction and can take up to two to three months depending on the town, so it is best to start the process sooner rather than later.
The Stages of an ADU Build
Every ADU follows a clear sequence:
- Site work: Excavation and digging to prepare for the foundation.
- Foundation: The foundation is poured and completed.
- Framing: The structure goes up using standard construction lumber built to code.
- Mechanicals: Electrical, plumbing, and heating and cooling systems are installed.
- Exterior: Siding, roofing, and windows are installed.
- Interior finishes: Kitchen, flooring, and paint complete the space.
Who Does the Work?
Bartlett Contracting manages the full project as your general contractor. Specialized trades, including site excavation, electrical, and plumbing, are handled by trade partners that we coordinate, so you have one point of contact from start to finish.
How to Keep Your ADU on Schedule
Start permitting early, choose your layout before construction begins, and make finish selections ahead of time. Construction does not begin until you have reviewed and approved your layout, which helps prevent changes once work is underway.
Want a timeline for your property? Contact Bartlett Contracting to discuss your ADU plans.
Frequently Asked Questions
How long does it take to build an ADU?
An ADU of about 650 square feet typically takes six to eight months to build. That timeline covers the foundation, framing, mechanicals, exterior work, and interior finishes through move in. Permitting is separate and happens before construction starts, so plan for additional time on the front end of your project.
How long does an ADU permit take in Connecticut?
An ADU building permit can take up to two to three months in Connecticut, depending on the town. Because timing varies by municipality, it is best to begin the permitting process as early as possible. Bartlett Contracting handles the permitting on your behalf, which helps keep the process moving.
What is the first step in building an ADU?
The first step is a conversation about your property, budget, and goals. Your contractor will ask who will live in the ADU, your timeline, and how you plan to pay for the project. From there, you select a layout, the design is finalized, and permitting begins before any site work starts.
Does Bartlett Contracting handle the plumbing and electrical?
Yes, Bartlett Contracting coordinates all plumbing and electrical work for your ADU. As the general contractor, we manage the specialized trades, including site excavation, electrical, and plumbing, and schedule them at the right stage of construction. You work with one team instead of hiring and managing each trade yourself.
When can I move into my ADU?
You can move in once the interior finishes are complete. After the kitchen, flooring, and paint are finished, the ADU is turnkey and ready to live in. For a typical 650 square foot unit, that is about six to eight months after construction begins, not counting the permitting period beforehand.
