Custom ADU Modular Home Plans
in Massachusetts and Rhode Island

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.

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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

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

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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.

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

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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.

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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.

 

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.

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A preliminary property review may consider:

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• 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

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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.

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

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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.

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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.

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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.

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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.

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

1. Initial Consultation

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

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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.

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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.

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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.

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5. Engineering and Permitting

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

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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.

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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.

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8. Delivery and Installation

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

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9. Final Completion

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