3 Best ADU Builders in Portsmouth, Rhode Island
Verified ADU contractors and builders in Portsmouth, RI
Showing 1–3 of 3 listings
Coastal Construction Management
Transform your underutilized garage into functional living space with expert conversion services throughout Portsmouth and the Rhode Island coastal area. Our experienced team specializes in garage-to-living-space conversions, handling everything from structural modifications to code compliance to create beautiful new rooms tailored to your home's needs.
ESHI Builders
Specializing in accessory dwelling unit construction throughout Portsmouth and Rhode Island, this contractor transforms properties into multi-unit homes with expertly designed ADUs that maximize your property's potential. From initial planning through final inspection, they deliver custom-built ADU solutions tailored to local building codes and your family's needs.
Remodeling Right
Specializing in accessory dwelling unit construction throughout Portsmouth and the Rhode Island area, we transform properties into multi-unit homes with expert planning and quality craftsmanship. Whether you're adding an in-law suite, guest house, or rental unit to your property, our team handles every phase from design through completion.
Frequently Asked Questions — ADU Builders in Portsmouth
How much does it cost to hire an ADU builder in Portsmouth?
ADU construction costs in Portsmouth, Rhode Island 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 Portsmouth to get accurate quotes for your specific project.
How long does it take to build an ADU in Portsmouth?
In Portsmouth, 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 Rhode Island local regulations. Prefab and modular ADUs often have faster timelines than site-built units.
Do I need a permit to build an ADU in Portsmouth?
Yes, a building permit is required for ADU construction in Portsmouth, Rhode Island. Your ADU builder will typically handle the permit application as part of their service. Rhode Island has adopted streamlined ADU permitting laws in recent years, which may reduce wait times.
What types of ADUs can be built in Portsmouth?
Common ADU types in Portsmouth 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 Portsmouth ADU builder can advise on what's allowed on your specific parcel.