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!

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

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.