Transform Your Basement Into a Beautiful, Functional Living Space

Premium Basement Remodeling & ADU Design-Build Services in MetroWest Massachusetts.

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Licensed & Insured. Basement & ADU Specialists Transparent Pricing Free Design Consultation


Unlock the Full Potential of Your Basement

We transform underutilized basements into beautiful, functional spaces designed to elevate your lifestyle and add value to your home in MetroWest, Massachusetts.

Complete Design + Build!

Home Offices

Inlaw Suites / ADU’s

What We DO!

Wellness Studios

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  • Dream it.

  • Finished basement stairs framingham

    Build it.

  • Grow it.

  • Live it.

Why Choose Basement Theory?

Specialists, Not Generalists
We focus solely on basements and ADUs — which means smoother projects, faster timelines, and better results.

Transparent Pricing & Clear Expectations
Detailed proposals, no hidden surprises, and predictable timelines.

High-Quality Craftsmanship
Your basement will feel like an extension of the upstairs — warm, dry, quiet, and beautifully finished.

Clean Job Sites & Respectful Crews
We treat your home like our own.

Design + Build Under One Roof
One team. One process. Zero confusion.

Our Simple 3-Step Process

1. Design & Planning

Phone consultation → Site visit → 3D designs → Fixed-price proposal.

2. Build

We handle everything: framing, electrical, plumbing, drywall, finishes.

3. Enjoy Your New Space

A beautiful, functional basement that increases your home’s value and lifestyle.

Get Pricing

  • We hired Chris to finish our basement in Natick. Throughout the whole process Chris and his team were helpful, informative, and flexible. They took our initial plan and helped us turn it into reality by customizing our layout and offering creative ideas. We would recommend CJO Builders (Basement Theory) to anyone looking for an honest and reliable builder

    Jim M. Natick, Ma

  • I don't think I can even begin to even do justice with this review. The work performed was second to none. I was astounded by the attention to detail during the week that they were at my home refurbishing my bathroom. I went into it thinking it was a basic lipstick on a pig job, but I've been left with an absolutely marvelous bathroom. I had previously been let down by numerous contractors or priced out when getting quotes. The entire week I was kept completely up to date on the timelines for each stage. Each sub contractor was also very transparent with regard to any issues they faced or just giving a summary of the work they performed each day.

    Johnathan - Ashland, Ma

  • Thanks to CJO Builders for the work done during our bathroom renovation. Chris was organized, responsive, professional and completed our project with minimal disruption at our home. We are so pleased with the results!

    ALI- Framingham, Ma

  • Thanks to CJO Builders for the work done during our bathroom renovation. Chris was organized, responsive, professional and completed our project with minimal disruption at our home. We are so pleased with the results!

    Lexie - Ashland, Ma

Book A Phone Consult

Indulge in a personalized consultation with our finished basement experts, where every discerning detail of your property desires is attended to with precision and care. Schedule your exclusive appointment today to experience a bespoke approach that elevates your basement journey to unparalleled heights.

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Primary Service Areas

  • Ashland

  • Framingham

  • Natick

  • Hopkinton

  • Holliston

  • Milford

  • Medway

  • Norfolk

  • Sherborn

  • Millis

  • Southborough

  • Westborough

  • Marlborough

  • Northborough