6 Best ADU Builders in New Castle, Delaware
Verified ADU contractors and builders in New Castle, DE
Showing 1–6 of 6 listings
Corrado Construction Company
We specialize in transforming garages into functional living spaces, bedrooms, and entertainment areas for homeowners throughout New Castle and the surrounding Delaware region. Our expert team handles every aspect of garage conversions, from structural modifications and insulation to electrical work and finishing touches.
Delpa Builders LLC
Specializing in accessory dwelling unit construction in the New Castle area, this contractor helps homeowners add functional living spaces to their properties. From initial design consultation through final permitting and build-out, they deliver ADUs tailored to your needs and Delaware's local requirements.
First State Inc
Transform your garage into functional living space with expert conversion services in New Castle, DE. Our specialized team handles every aspect of garage-to-living-space renovations, from structural modifications to finished installations.
PJ Fitzpatrick
Transform your underutilized garage into functional living space with expert conversion services throughout the New Castle area. Our specialized team handles every aspect of garage-to-living-space conversions, from design and permitting to structural modifications and finishing work.
Space Makers Sheds, LLC
Transform your underutilized garage into functional living space with expert conversion services in New Castle, DE. Our specialized team handles every aspect of garage-to-living-space conversions, from design and permits to construction and finishing touches.
The House Medic
Transform your underutilized garage into functional living space with expert conversion services tailored to New Castle homes. We specialize in garage-to-living-space renovations that maximize your property's potential while ensuring quality craftsmanship and code compliance.
Frequently Asked Questions — ADU Builders in New Castle
How much does it cost to hire an ADU builder in New Castle?
ADU construction costs in New Castle, Delaware 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 New Castle to get accurate quotes for your specific project.
How long does it take to build an ADU in New Castle?
In New Castle, 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 Delaware local regulations. Prefab and modular ADUs often have faster timelines than site-built units.
Do I need a permit to build an ADU in New Castle?
Yes, a building permit is required for ADU construction in New Castle, Delaware. Your ADU builder will typically handle the permit application as part of their service. Delaware has adopted streamlined ADU permitting laws in recent years, which may reduce wait times.
What types of ADUs can be built in New Castle?
Common ADU types in New Castle 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 New Castle ADU builder can advise on what's allowed on your specific parcel.