Accessory Dwelling Units Solutions
Modern container homes designed for Accessory Dwelling Units, offering durable construction, energy efficiency, and flexible placement on a wide range of properties.
The Problem With Accessory Dwelling Units
For decades, homeowners who wanted to add a unit to their property faced a wall of local zoning restrictions that banned ADUs outright, demanded expensive variances, or buried the project in hearings until most people gave up. Rhode Island’s 2024 ADU law (RIGL §45-24-73) changed that — establishing ADUs as legal by right statewide. Massachusetts and Connecticut followed, and states from California to Florida are moving in the same direction. The zoning fight that stopped most of these projects is no longer the obstacle it was.
What remains is the construction problem. Traditional contractors are expensive, slow to schedule, and prone to overruns. A stick-built ADU in New England averages ~10–14+ months from permit to occupancy (U.S. Census Bureau / NAHB, 2024) — and the finished cost rarely matches the original estimate. For homeowners trying to generate rental income or house a family member, that timeline and unpredictability make conventional construction a bad bet.
Our Solution
A fully finished ADU on your property in 8–14 weeks.
ContainerSolutions builds prefab ADUs from repurposed Corten steel, delivered factory-complete and installed on a permanent foundation. Most of the work traditional housing requires, is already complete before it leaves the factory. Site work and production run in parallel, which is how we compress what traditionally takes over a year into weeks.
- Multiple ADU options — a variety of sizes and configurations, including the Pod20 and Core40; visit our models page for details on all available models
- 8–14 weeks start-to-installed, versus ~10–14+ months for conventional ADU construction
- 8-foot-wide footprint — fits constrained backyards, side yards, and tight urban lots; craned in with minimal staging
- Permanent foundation — bolted or welded to steel plates embedded in concrete, help our units meet standards for residential lending; visit our financing page for current lending partners and program details
- Rhode Island state-approved, ICC NTA, LLC third-party inspected — permitted as a permanent dwelling
- Solar/battery system standard on all models except the Pod20 — near-zero monthly energy cost for occupants
ContainerSolutions delivers a permanent ADU faster and more predictably than any conventional builder — generating long-term rental income, property value, or housing for the people who matter most.
Why Homeowners Choose Modular ADUs
The homeowners who move forward with a ContainerSolutions ADU aren’t settling for a shortcut. They’re choosing a better process.
- The zoning window is open. ADU-by-right laws across Rhode Island, Massachusetts, and Connecticut — and in states nationwide — often means you can move forward without variance fights or zoning board hearings.
- Fixed pricing that holds. Factory production eliminates the contractor overruns, weather delays, and scheduling gaps that routinely blow up stick-built budgets. The price agreed at signing is the price at delivery.
- The footprint fits where conventional builders won’t go. At 8 feet wide, CS units install on lots where a traditional contractor would walk away.
- A permanent structure that adds lasting value. Foundation-set and code-compliant, a CS ADU adds to the appraised value of your property and generates reliable long-term rental income.
- Core40 carries almost no energy cost. The solar/battery system handles most of the unit’s electricity. That’s meaningful monthly savings for whoever lives there.
- Tour the actual product before you commit. The Core40 model home is available for private visits in East Providence, RI — fully finished, exactly as delivered.
Choosing modular is a faster, more predictable path to a permanent structure with the same legal standing as any other home on your property.
Frequently Asked Questions
How much does a prefab ADU cost?
Pricing varies by model. Visit our models page to see current pricing on models such as the Pod20 and Core40. Site costs — foundation, utilities, permitting — are additional and vary by property conditions. ContainerSolutions provides a detailed site cost guide so you can budget the full picture before committing to anything.
How long does it take to build and install a modular ADU?
8–14 weeks from signed contract to installed unit. Site preparation and factory production run in parallel. Traditional housing development in New England typically runs ~10–14+ months from permit to occupancy (U.S. Census Bureau / NAHB, 2024).
Are ADUs legal in Rhode Island, Massachusetts, and Connecticut?
Yes, but it depends on your state and local zoning laws. For example, Rhode Island enacted ADU-by-right legislation under RIGL §45-24-73, but currently prohibits short-term rental use in ADUs — long-term residential rental is permitted. Massachusetts and Connecticut have both passed strong ADU laws with their own local variations. Confirm setback, utility, and use requirements with your municipality before proceeding.
Does a ContainerSolutions ADU need a permanent foundation?
Yes — every CS unit is bolted or welded to steel plates embedded in concrete, help our units meet standards for residential lending. Visit our financing page for information on current lending partners and program details.
Can I finance a ContainerSolutions ADU?
Yes, with the right setup. Financing options are available for CS homes that are properly permitted, installed on a permanent foundation, and issued a Certificate of Occupancy. That’s exactly how CS homes are built and delivered. Financing requirements will vary with each lending institution. Some lenders are more familiar with non-conventional construction than others. Your CS team can help connect you with lenders who have experience with our homes.
How durable is a steel ADU compared to wood-frame construction?
Corten steel does not rot, warp, or attract termites. Every CS unit ships with a three-layer corrosion protection system engineered for long-term exposure. In the Northeast, where moisture and freeze-thaw cycles accelerate wood decay, that structural difference adds up over time.
What are the operating costs of a ContainerSolutions ADU?
The Core40’s solar/battery system covers most of the unit’s energy demand, keeping monthly electric costs close to zero for typical residential use. Energy incentive programs allow you to actually make money.
Can I use a ContainerSolutions ADU as a short-term rental?
Rhode Island currently prohibits short-term rental use in ADUs. For long-term residential rental in RI, a CS ADU is a strong investment. For STR use, consult your local zoning office to confirm placement options — rules vary by state and municipality.
Explore Accessory Dwelling Units Options
Thinking about adding an ADU to your property?
ContainerSolutions works with homeowners across Rhode Island, Massachusetts, and Connecticut to evaluate lot conditions, size options, and site requirements before anything is ordered. Whether the goal is long-term rental income, housing for a family member, or adding lasting value to your property, the path starts with a conversation.
- Review the Pod20 and Core40 and more on our models page
- Explore financing and down payment assistance options
- See all standard features included on every unit
Book a private tour of the Core40 model home in East Providence, RI