Build a Legal ADU in Central MA – Add Income, Value, or Space

From design to permits and construction — turnkey ADUs built to match your goals.

Accessory Dwelling Units (ADUs) – Build Income and Family Space with CJO Builders

  • Why Build An ADU?

    Whether you want to create passive rental income, build a private space for aging parents, or add more functional square footage to your property — an Accessory Dwelling Unit (ADU) is one of the smartest moves you can make in today’s market.

    At CJO Builders, we specialize in delivering high-quality, code-compliant ADUs across Massachusetts with a sharp eye for project efficiency, cost control, and timeless design.

  • What is an ADU?

    An Accessory Dwelling Unit (also called an in-law apartment, guest suite, or backyard cottage) is a self-contained living space built on the same lot as a single-family home. ADUs can be:

    Basement conversions

    Garage apartments

    Detached backyard units

    Additions to the main home

  • Why Choose CJO Builders?

    ✅ Turnkey Design & Build

    From concept to completion — we handle everything: permitting, design, construction, inspections, and project management.

    ✅ Speed & Efficiency

    We use modern project management software and local partnerships to deliver results faster — without cutting corners.

    ✅ Local Knowledge

    We understand the zoning laws and permitting process in Ashland, Framingham, Natick, and surrounding towns.

    ✅ Family-Owned, High-Integrity Work

    We treat your property like it’s our own and communicate every step of the way.

Free Consultation
White house with blue door, surrounded by greenery and a concrete walkway leading to the entrance.

What Does an ADU Cost?

While every project is different, most ADUs in Massachusetts fall between $150,000–$250,000+ depending on size, finishes, and complexity (utilities, foundation, etc.).

We offer clear and honest estimates so there are no surprises — and we can work with your budget to build something amazing.

If you would like our free guide to building an adu in massachusetts click the link below!

Download Your Free Guide
A graphic with four options for using an ADU: 1. Passive Rental Income, 2. Aging Parents or Adult Children, 3. Boost Value, 4. Private Home Office or Guest House.

Is an ADU Right For You?

Here are a few of the most common reasons clients build with us:

  • You want passive rental income (short- or long-term)

  • You have aging parents or adult children who need independence

  • You want to boost home value

  • You need a private home office or guest house

  • You’re thinking about downsizing but don’t want to leave your home

Make It

Let’s Talk

Ready to explore the possibilities? We offer a free 15-minute consultation to see if your property is eligible for an ADU and help you map out next steps.

 FAQs

  • It depends on your town’s zoning laws, lot size, and existing structures. We’ll help you navigate that.

  • Yes. But we handle all permitting, inspections, and compliance on your behalf.

  • Typically between 6–9 months including permitting and construction.

  • Absolutely. We’ve built some of the best basements in the state — and we know how to turn them into legal, livable spaces.

See Our Work

Empty living room with hardwood flooring, beige walls, white baseboards, multiple ceiling lights, a window, a door with glass panes, and support columns.

While ADUs are new to our service list as they are new to the Massachusetts market, our experience in high-end basement remodels, full home renovations, and kitchen/bath projects shows the quality you can expect.

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