Custom Modular ADUs in Massachusetts and Rhode Island

Create more living space on your property with a custom modular accessory dwelling unit designed around your needs, your property, and your budget.

Modular Visions designs and builds custom modular ADUs throughout Rhode Island and Massachusetts. Whether you are planning a private residence for a parent, an independent space for an adult child, a home office, a guest house, or a long-term rental unit, we can help guide the project from the earliest planning stages through final completion.

Unlike companies that offer only a small selection of fixed models, Modular Visions can design and build nearly any modular ADU configuration. You can begin with one of our sample plans or work with us to create a layout specifically for your family, property, and lifestyle.

Our services may include preliminary design, zoning review, permitting coordination, site work, foundation construction, utility connections, modular construction, installation, and final completion.

Explore our ADU designs or contact us for a free preliminary consultation.

Start with one of our sample floor plans or let us design an ADU specifically for your property, family and budget. We can design and build nearly any modular ADU configuration, including one- and two-bedroom homes, home offices, in-law residences, aging-in-place layouts and rental units.

ChatGPT Image Jul 16, 2026 at 02_18_17 PM.png

Why Build an ADU?

An accessory dwelling unit can add valuable, flexible living space without requiring you to leave the property or purchase another home.

Homeowners build ADUs for many reasons, including:

Housing for parents or aging family members
Independent living space for adult children
A private guest house
A home office or professional workspace
Long-term rental income
Caregiver accommodations
Aging in place
Multigenerational living
Increasing the usefulness and value of a property

An ADU can provide privacy and independence while still keeping family members nearby. It can also allow a property to adapt as your family’s needs change over time.

A well-designed ADU should feel like a complete home, not an afterthought. That is why we focus on comfortable layouts, natural light, storage, accessibility, energy efficiency, and architectural compatibility with the main residence.

ChatGPT Image Jul 16, 2026 at 02_51_35 PM.jpg

Explore Sample ADU Designs

Our sample ADU plans are intended to provide a starting point and help homeowners visualize what may be possible.

Available designs may include:

Compact one-bedroom ADUs
Two-bedroom ADUs
One-and-a-half-bath layouts
Two-bath layouts
Home office and guest-room combinations
Open-concept kitchen and living areas
Aging-in-place designs
Accessible layouts
Designs with vaulted ceilings
Traditional gable-roof homes
Cottage-style ADUs
Contemporary ADUs
Plans designed to complement an existing home

Every property is different. Setbacks, septic capacity, utilities, access, topography, drainage, and local zoning requirements can all affect the final design.

We can modify room sizes, window locations, rooflines, exterior materials, kitchens, bathrooms, entrances, and interior finishes to create an ADU that works for your site and your goals.

Start with one of our sample plans or let us create a custom ADU specifically for your property.

ChatGPT Image Jul 16, 2026 at 02_48_35 PM.jpg

One-Bedroom and Two-Bedroom ADU Options

One-Bedroom ADUs

A one-bedroom ADU can be an excellent option for a parent, single occupant, couple, guest residence, or rental unit.

One-bedroom plans can include:

Open kitchen and living areas
Full-size kitchens
Walk-in or reach-in closets
Laundry facilities
Accessible bathrooms
Private patios or entrances
Home office areas
Vaulted or nine-foot ceilings

These homes can be designed to feel spacious and comfortable while maintaining an efficient footprint.

Two-Bedroom ADUs

A two-bedroom ADU provides greater flexibility for families, guests, caregivers, office space, or long-term occupancy.

The second bedroom can be used as:

A guest room
A home office
A caregiver’s room
A hobby room
A child’s bedroom
Additional storage or flexible living space

Depending on the property and local requirements, two-bedroom ADUs may include one, one-and-a-half, or two bathrooms.

We can help you compare the cost, size, and long-term benefits of different layouts before you commit to a final plan.

ChatGPT Image Jul 16, 2026 at 02_13_22 PM.png

Recent ADU Designs and Projects

Every ADU project presents a different design opportunity.

Our recent planning and design work has included:

Two-bedroom ADUs for multigenerational living
One-bedroom homes for aging parents
ADUs with home-office space
Traditional gable-roof designs
Upgraded designs with dormers
Plans with nine-foot ceilings
Accessible bathrooms
Open-concept kitchens and living spaces
Designs intended to complement existing homes
ADUs planned alongside pools and other property improvements
Layouts designed around septic, setbacks, and site-access limitations

Project photographs, floor plans, elevations, and construction updates help homeowners understand the modular process and the range of available design options.

What Is Included in a Turnkey ADU?

A turnkey ADU is more than the modular building itself. It includes the work required to prepare the property, install the home, connect the utilities, and complete the project.

Depending on the property and project scope, Modular Visions can coordinate:

Preliminary floor-plan development
Exterior elevations
Site and zoning review
Architectural and engineering coordination
Permit preparation
Excavation and site preparation
Foundation construction
Septic or sewer coordination
Water and utility connections
Electrical service
Heating and cooling systems
Modular transportation and installation
Roofing and exterior completion
Interior finish work
Porches, stairs, decks, and entry platforms
Final inspections
Certificate-of-occupancy coordination

Every proposal should clearly identify what is included and what remains the homeowner’s responsibility.

We believe homeowners should understand the complete project cost, not simply the price of the modular unit. Our goal is to help you evaluate the full scope before construction begins.

How Much Does A Modular ADU Cost?

The cost of a modular ADU depends on much more than the square footage of the home.

Important cost factors include:

Size and number of bedrooms
Number of bathrooms
Kitchen size and finishes
Ceiling height
Roof design
Exterior materials
Interior finish selections
Foundation type
Site access
Excavation requirements
Utility distances
Septic or sewer requirements
Electrical-service upgrades
Grading and drainage
Porches, decks, and stairs
Local permitting and engineering requirements

A simple ADU on a level, accessible property may cost significantly less than the same home on a sloping lot requiring extensive excavation, retaining walls, utility work, or septic improvements.

Many advertised modular-home prices cover only the factory-built portion of the structure. They may not include the foundation, transportation, crane, site work, utilities, permits, finish work, or final inspections.

Modular Visions focuses on helping homeowners understand the probable total project investment.

We also offer a range of finish levels. If a preliminary design exceeds the target budget, we can often review the plan and adjust selected upgrades, finishes, dimensions, or design features to help control costs.

Screenshot 2024-09-01 at 11.03.57 PM.png

Can An ADU Be Built On

My Property?

ADU requirements vary by state, city, and town. The approval process can also depend on the size of the lot, existing buildings, utilities, septic system, wetlands, flood zones, and other property conditions.

A preliminary property review may consider:

Lot size
Zoning district
Building setbacks
Maximum building coverage
ADU size limitations
Building height
Parking requirements
Septic capacity
Public sewer availability
Water service
Wetlands or conservation restrictions
Flood-zone requirements
Property access
Fire-department access
Utility easements
Historic-district requirements
Owner-occupancy requirements
Rental restrictions

Even when an ADU is allowed, the location and configuration may need to be carefully planned.

Modular Visions can help review the available property information and identify the next steps.

Final zoning and permitting determinations are made by the applicable local and state authorities.

Say Goodbye to Weather Delays, Permit Bottlenecks, and Construction Headaches

Building an ADU does not have to mean months of uncertainty, weather exposure, and the stress of coordinating multiple contractors on your own.

With modular construction, much of your ADU is built indoors in a controlled factory environment. Materials are protected from prolonged rain, snow, and moisture, while construction can continue regardless of many common New England weather conditions. At the same time, the foundation and site work can move forward at your property, allowing important phases of the project to happen simultaneously.

Modular Visions also helps coordinate the many details that can slow down a traditional construction project. Depending on the agreed scope, we can assist with preliminary design, zoning review, engineering, permit preparation, site work, foundation construction, utility coordination, modular installation, and final completion.

While every project remains subject to local approvals and inspection schedules, careful planning and early identification of property requirements can help reduce avoidable delays and last-minute surprises.

Instead of managing separate designers, contractors, factories, and site crews on your own, you can work with one experienced team that understands how the pieces of a modular ADU project fit together.

The result is a more organized process, less on-site disruption, and a clearer path from your initial idea to a completed ADU.

Screenshot 2024-09-01 at 11.04.14 PM.png

Our ADU Design and Construction Process

1. Initial Consultation

We begin by discussing your goals, preferred size, number of bedrooms, budget, property location, and intended use for the ADU.

2. Preliminary Property Review

We review available property information to identify potential zoning, setback, access, utility, septic, drainage, and site-related considerations.

This early review helps determine whether the project appears feasible and what additional information may be required.

3. Preliminary Design

We can begin with an existing floor plan or create a custom layout. During this stage, we consider room sizes, accessibility, privacy, entrances, windows, roof design, and how the ADU will relate to the main home.

4. Preliminary Pricing

Once the general design and project scope are established, we can prepare preliminary pricing.

The estimate may include the modular home, foundation, site work, utilities, installation, and completion work, depending on the agreed scope.

5. Engineering and Permitting

After the design is approved, the necessary architectural, structural, energy, site, septic, and other project documents are prepared for permitting.

6. Site Work and Foundation

While the modular home is being constructed in the factory, site preparation and foundation work can move forward at the property.

This parallel process is one of the major advantages of modular construction.

7. Modular Construction

The ADU is built indoors in a controlled factory environment. This helps protect materials from prolonged exposure to weather and allows multiple stages of construction to proceed efficiently.

8. Delivery and Installation

The completed modules are transported to the property and set onto the prepared foundation.

9. Final Completion

After installation, the remaining exterior, interior, utility, mechanical, and finish work is completed. Final inspections are then scheduled.

Request a Free Preliminary ADU Consultation

Thinking about adding an ADU to your property?

Tell us where the property is located, how you plan to use the ADU, your preferred number of bedrooms, approximate size, and desired budget range.

Modular Visions can help you explore the design possibilities, review preliminary property considerations, and develop a practical path forward.

We design and build custom modular ADUs throughout Rhode Island and Massachusetts, including one-bedroom homes, two-bedroom homes, in-law residences, home offices, guest houses, and aging-in-place layouts.

Contact Modular Visions today to schedule a free preliminary consultation.