What Utilities Does an ADU Need? A Guide for Connecticut Homeowners
What Utilities Does an ADU Need? A Guide for Connecticut Homeowners
An accessory dwelling unit is a fully functional home, which means it needs reliable utility connections. The type of utilities on your property can affect both cost and planning. Here is what homeowners in Wolcott, Waterbury, Cheshire, and nearby towns should know.
The Three Essential ADU Utilities
Every ADU needs three core connections: sewer or septic, water, and power. Bartlett Contracting coordinates each connection with our trade partners as part of the build, so the ADU is ready to live in when construction is complete.
City Utilities vs. Well and Septic
Connecting an ADU is less expensive when your property is on city water and sewer, as is common in Waterbury and much of Cheshire. Rural towns such as Woodbury and Southbury more often rely on private wells and septic systems. In those cases, the health department reviews whether your septic system is large enough to support another dwelling. If it is not, the system can be upgraded, which adds to the project cost.
Why ADUs Share the Main Home's Meters
ADU utilities connect to the existing home's utility meters. There is one electric meter and one bill for the property. Towns do not want an ADU treated as a separate multifamily or rental property, and a second meter would change how the property is classified.
Heating and Cooling Options
Most ADUs use ductless mini split systems for efficient heating and cooling. Larger ADUs can use a forced air heating and cooling system. Your contractor will recommend the best fit based on size and layout.
Have questions about your property's utilities? Contact Bartlett Contracting to talk through your ADU plans, or see our service areas.
Frequently Asked Questions
What utilities does an ADU need?
An ADU needs sewer or septic, water, and power. These connections make the ADU a fully independent living space with a working kitchen and bathroom. Utilities are typically run from the main home's existing services, and your general contractor coordinates the site work, plumbing, and electrical needed to connect them.
Can an ADU connect to my existing septic system?
Yes, an ADU can connect to your existing septic system if it has enough capacity. The health department reviews whether your system can support another dwelling. If the system is too small, it can be upgraded. An upgrade adds cost, so it is important to check capacity early in planning.
Does an ADU need a separate electric meter?
No, an ADU typically shares the existing home's electric meter. There is one meter and one electric bill for the property. Towns generally do not want ADUs treated as separate multifamily or rental properties, so utilities are tied to the main home's meters rather than set up independently.
Is it cheaper to build an ADU with city water and sewer?
Yes, building an ADU on city water and sewer is generally less expensive. Connecting to municipal services is usually simpler than working with a private well and septic system. Properties on well and septic may need a health department review and possibly a septic upgrade, which increases total project cost.
How is an ADU heated and cooled?
Most ADUs are heated and cooled with ductless mini split systems. Mini splits work well for smaller spaces and do not require ductwork. For larger ADUs, a forced air heating and cooling system is another option. Your contractor will recommend a system based on the size and layout of your unit.
