ADU Builders in Holliston, MA
Accessory Dwelling Units
In Holliston, MA, constructing an Accessory Dwelling Unit (ADU) offers homeowners a rare chance to blend thoughtful design with the town’s flexible zoning policies, enhancing both living space and property value. Whether accommodating multigenerational families or creating rental income, an ADU in Holliston unlocks tailored solutions that reflect the community’s unique character and lifestyle.
ADU Types We Build in Holliston, MA
In Holliston, MA, homeowners can choose from a variety of ADU styles to suit their needs and property layout. Detached ADUs offer complete privacy and a separate entrance, making them ideal for multi-generational living or rental opportunities. Attached ADUs seamlessly blend with the main house, providing convenient access while maintaining a cohesive architectural design. Meanwhile, garage conversions maximize existing space without expanding the footprint, delivering a cost-effective solution that enhances property value with minimal disruption.
Studio ADU
A compact, efficient layout for one person — perfect for a caregiver, aging parent, or rental tenant.
One-Bedroom ADU
Ideal for aging-in-place, caregivers, or long-term rental use with a private bedroom and full bath.
Two-Bedroom ADU
Best for multigenerational living, small families, or maximizing rental income potential.
Garage Conversion ADU
Convert an underused garage or build a finished apartment above it into a fully independent living space.
Detached ADU
A standalone backyard cottage with maximum privacy and clear separation from the main home.
Attached ADU
An addition connected to your home — ideal when you want shared utility runs and convenient access.
Quality Finishes, Built to Last
Navigating ADU zoning and permitting in Holliston, MA involves understanding specific local regulations and securing approvals from the town hall. Our contractor expertly manages the entire process, ensuring a smooth experience from application to final permit.
Our ADU Process in Holliston, MA
Dream to Blueprint: We start by exploring your property’s potential and sketching a custom ADU that fits your lifestyle and Holliston’s charm perfectly. Green Light Ready: Our team navigates the maze of local permits, ensuring every form and approval is secured smoothly so your project gets the official go-ahead without headaches. Building Your Vision: Watch your ADU rise as skilled craftsmen bring plans to life with precision and care, turning drawings into a cozy, functional space just for you. Keys and Confidence: Together, we tour your new ADU, fine-tuning details and making sure everything feels just right before handing over the keys to your fresh, stress-free living area.
1. Feasibility & Site Fit
We confirm what your Holliston lot can support: placement, access, utilities, parking, and the path to approvals. You get a clear go/no-go before spending money on drawings.
2. Design & Planning
We translate your goals into a buildable plan — layout, materials, and a detailed scope — structured for a smooth route into permitting and construction.
3. Permits & Approvals
We manage the permit process with Holliston’s Building Department, including plan sets, site plan, energy code documentation, and sewer/septic approvals as applicable.
4. Construction & Closeout
We manage the full build — site work, framing, MEPs, insulation, finishes, and the inspection sequence needed to close the permit and move toward occupancy.
ADU Zoning & Permitting in Holliston, MA
- Massachusetts law allows one ADU “by right” in single-family zoning districts, subject to reasonable local regulations and building/septic code requirements.
- ADU size is capped at the lesser of 50% of the principal dwelling’s gross floor area or 900 sq ft statewide.
- Owner-occupancy requirements cannot be imposed on protected-use ADUs under Massachusetts law.
- Holliston homeowners should confirm local setback, parking, and permitting requirements with the Building Department before beginning design work.
- All ADUs require a separate entrance that meets safe egress standards under state building code.
Disclaimer: Zoning and code rules can change, and site conditions vary. We confirm your Holliston property’s requirements early in the process and guide you through a compliant, documented permit path.
Frequently Asked Questions — ADUs in Holliston, MA
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Build Your ADU in Holliston, MA
Ready to add an accessory dwelling unit to your Holliston property? Contact Regulus Construction today for a free, no-obligation consultation. We respond within 24 hours.
Fill out the form on our contact page and one of our team members will reach out within 24 hours to discuss your project.