6 Best ADU Builders in Johnston, Rhode Island
Verified ADU contractors and builders in Johnston, RI
Showing 1–6 of 6 listings
American Buildings Co
Transform your underutilized garage into functional living space with expert conversion services in Johnston, RI. We specialize in garage-to-living-space renovations that maximize your home's potential while maintaining structural integrity and code compliance.
Future Contracting and Estimators, LLC
Transform your underutilized garage into functional living space with expert conversion services in Johnston, RI. From design through completion, this specialized contractor handles every aspect of turning your garage into a bedroom, office, or recreational area.
Invest & Remodel, LLC
Specializing in garage-to-living-space conversions throughout Johnston, RI, this contractor transforms underutilized garages into functional rooms that add value and livable square footage to your home. From design through final construction, they handle all aspects of converting your garage into the additional bedroom, office, or recreation space your family needs.
Mendez General Contractor LLC
Transform your garage into functional living space with expert garage-to-living-space conversions throughout the Johnston area. This experienced contractor specializes in converting garages into bedrooms, home offices, and recreation rooms while handling all structural, electrical, and finishing work to code.
Northeast Design Build Remodel
Northeast Rhode Island's trusted partner for accessory dwelling unit construction, from initial design through final build-out of guest houses, in-law suites, and backyard living spaces. Our specialized team guides Johnston-area homeowners through every phase of ADU development to maximize property value and create flexible living solutions.
Rockhouse Construction
Specializing in accessory dwelling units throughout Johnston and the surrounding Rhode Island area, we help homeowners maximize their property potential with custom-built ADUs designed to meet local codes and your family's needs. From initial planning through final inspection, our experienced team handles every aspect of ADU construction to create functional, value-adding living spaces on your property.
Frequently Asked Questions — ADU Builders in Johnston
How much does it cost to hire an ADU builder in Johnston?
ADU construction costs in Johnston, 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 Johnston to get accurate quotes for your specific project.
How long does it take to build an ADU in Johnston?
In Johnston, 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 Johnston?
Yes, a building permit is required for ADU construction in Johnston, 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 Johnston?
Common ADU types in Johnston 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 Johnston ADU builder can advise on what's allowed on your specific parcel.