3 Best ADU Builders in Greenwich, Connecticut
Verified ADU contractors and builders in Greenwich, CT
Showing 1–3 of 3 listings
Alpha Building & Construction, LLC.
Specializing in accessory dwelling unit (ADU) construction throughout Greenwich and Fairfield County, we help homeowners add secondary living spaces that maximize property value and versatility. From design through completion, our team handles every aspect of building compliant, quality ADUs for multi-generational living, rental income, or guest accommodations.
Broadbent Construction
Specializing in garage-to-living-space conversions in Greenwich, CT, this contractor transforms underutilized garages into functional bedrooms, home offices, and recreation areas with quality craftsmanship and attention to detail. Whether you're looking to maximize your home's living space or add valuable square footage, they deliver professional conversion projects tailored to your needs.
D.A.S. Custom Builders
Specializing in accessory dwelling unit construction throughout Greenwich and Fairfield County, this contractor transforms properties with expertly built ADUs that maximize your land's potential while adding valuable living space or rental income.
Frequently Asked Questions — ADU Builders in Greenwich
How much does it cost to hire an ADU builder in Greenwich?
ADU construction costs in Greenwich, Connecticut vary widely depending on size, type, and site conditions. Detached ADUs typically range from $150,000–$400,000+, while garage conversions and attached ADUs can be more affordable. Contact multiple builders in Greenwich to get accurate quotes for your specific project.
How long does it take to build an ADU in Greenwich?
In Greenwich, the ADU construction timeline typically ranges from 6 to 18 months from permit application to move-in. Permitting alone can take 2–6 months depending on Connecticut local regulations. Prefab and modular ADUs often have faster timelines than site-built units.
Do I need a permit to build an ADU in Greenwich?
Yes, a building permit is required for ADU construction in Greenwich, Connecticut. Your ADU builder will typically handle the permit application as part of their service. Connecticut has adopted streamlined ADU permitting laws in recent years, which may reduce wait times.
What types of ADUs can be built in Greenwich?
Common ADU types in Greenwich include detached ADUs (backyard cottages), attached ADUs, garage conversions, basement conversions, and prefab/modular ADUs. The best type for your property depends on lot size, zoning, and budget. A local Greenwich ADU builder can advise on what's allowed on your specific parcel.