Basement Finishing Contractors
Turn your unfinished space into something worth using
Most homes are sitting on hundreds of square feet of untapped potential. Bay State Design & Construction transforms unfinished basements and attics into functional, finished spaces — whatever you need the room to be.
Team Experience
Projects
rating Average
Our Approach
We see potential where most people see storage
An unfinished basement or attic is a blank slate. And that's actually one of the harder things to work with. Without walls, a ceiling, or a defined purpose, it's easy to end up with a finished space that doesn't quite work the way you pictured it.
We start every project by understanding how you want to use the space. A teenage hangout has different needs than a home theater, a guest suite, or a rental unit. From there we design around the actual dimensions and constraints of your space, from ceiling height, egress, utilities, and insulation — and build something that feels like it belongs in your home, not an afterthought underneath it.
A finished basement or attic can become more than extra living space — it can become a fully self-contained unit. If you're thinking about an ADU or in-law suite, our FlexUnit™ service is where that conversation starts.
Reasons to finish your basement or attic
What could your unfinished space become?
- Your kids need their own space and you need yours back
- You've been storing things down there for years and want something better
- You want a dedicated home theater, gym, or entertainment room
- A guest suite would change how your family visits
- You're thinking about rental income without buying a second property
- Your basement or attic could qualify as an ADU and add real value to your home
- You're preparing to sell and finished square footage moves the needle
What we can build
Basement brainstorm ideas
Seeing is believing. Here are some of the types of basement projects we typically work on. Need more ideas? We can get creative during your free consult.
Our Portfolio
Snapshots of recent projects
REviews
Hear from happy homeowners
Great guys and easy to work with! I couldn't be happier with my beautiful new kitchen!
The best! Gave a super reasonable estimate and walked me through all the steps and timeline , finally have my (dream) kitchen.
I highly recommend Bay State Design & Construction to anyone looking for reliable, skilled, and professional construction services.
These guys are amazing! Helped me build a two story addition with a master suite and I couldn't be more thrilled with the product.
The guys from Bay State design were prompt well priced and kept my project moving without missing a step. Great work guys!
I hired these guys to build an attached garage at my house. Throughout the entire process they went above and beyond all expectations and their pricing was super fair.
This team is very professional, communicative and great to work with. Gio provided comprehensive building plans for me within a short timeframe, as promised.
How it Works
Typical kitchen remodel process
Site Visit & Consultation
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We visit your home, meet with you, and walk through your vision, goals, and any structural considerations.
Detailed estimate
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We develop a thorough estimate based on your agreed scope of work — no surprises, no vague line items.
Contract & Design Session
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Once you accept the estimate, we send over a contract and schedule a design session to lock in materials, finishes, and layout.
3D Render & Construction docs
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We produce a 3D rendering of your space and all structural construction documents entirely in-house.
Permits & materials
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We apply for all required permits and order long-lead materials as soon as they're issued — keeping your project on schedule.
Construction & inspections
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Work begins. We manage every phase of construction and every required inspection through final sign-off so nothing gets missed!
Bay State Design & Construction
Why homeowners choose BSDC
One point of contact, start to finish
No chasing down architects, contractors, or permit offices. You have one team and one person to call, from first sketch to final walkthrough.
We design around your budget
Many firms design the dream, then hand you a bill that doesn't match it. We start with your number and build the plan around it — no sticker shock.
Your vision survives the build
A lot gets lost when the design firm hands off to the contractor. We can draw the plans and build to them. AKA: what you approved is what gets built.
Your timeline is ours to protect
When design and construction live under one roof, no one else's schedule can slow yours down. We control the process so you're not waiting on a separate third party to move forward.
Frequently Asked Questions
Interior trim and millwork FAQs
Ceiling height, moisture levels, and egress are the three biggest factors. Most basements can be finished with the right approach — we assess all of it during the on-site consultation and tell you honestly what's possible and what it involves.
In most Massachusetts municipalities, yes. Finished living space requires permits covering framing, electrical, plumbing if applicable, and insulation. We handle the entire permitting process in-house.
Often yes, depending on your town's zoning and the layout of the space. Egress, fire separation, and utility requirements all factor in. If that's the direction you're headed, our FlexUnit™ service is the right starting point — it's designed specifically for ADU feasibility and construction.
Anything from a home theater and kids playroom to a guest suite, home office, gym, or rental unit. We've built them all. The design starts with how you want to use it.
We sure can! Attic conversions follow a similar process — we assess ceiling height, structural capacity, insulation requirements, and access before designing the space. Attics can become bedrooms, offices, or bonus rooms depending on what the structure allows.
Most basement finishing projects run 6 to 10 weeks depending on scope and complexity. A full basement with a bathroom, bedroom, and living area takes longer than an open rec room. We give you a realistic timeline during the estimate.
Every project comes with a 1-year workmanship warranty. If something isn't right with our work, we come back and make it right.
Ready to put your space to work?
Hundreds of square feet of untapped potential. Let's figure out what yours could become.