How much does basement finishing cost?

Finishing a basement in the Chicago suburbs typically runs $45,000–$90,000, or $90,000–$150,000+ once you add a bedroom and full bath — driven by square footage, layout, finishes, and whether you need egress windows or below-grade plumbing. GS Construction provides a free, itemized estimate broken down by phase.

How long does basement finishing take?

A typical basement finish takes 6–12 weeks. Waterproofing, framing, electrical, and plumbing are the longest phases. Adding a full bathroom or wet bar adds 1–2 weeks. We work to minimize disruption to your daily life.

Do I need permits to finish my basement in Illinois?

Yes — Illinois municipalities (Arlington Heights, Palatine, Hoffman Estates, Schaumburg, etc.) all require building, electrical, and plumbing permits for basement finishing. GS Construction handles all permitting and inspections for you.

Can you add a bedroom or bathroom in my basement?

Yes. Basement bedrooms require code-compliant egress windows, and bathrooms require proper plumbing tie-ins (often with an ejector pit). We handle the engineering, permits, and full build.

What about moisture and water in the basement?

Before any finishing, we assess your basement for moisture intrusion. We can install vapor barriers, sump systems, drain tile, and proper insulation to ensure your finished space stays dry and mold-free.

Chicago Suburbs Basement Finishing — 71 Reviews · 40+ Yrs

Finished basement with a game room, exposed brick feature wall, hardwood-look floors and a full bathroom — representative of the finished basement projects GS Construction builds in the Chicago suburbs

Expert Basement Remodeling Services

Most of a basement is decided before the drywall ever goes up: where the water's really coming from, whether the egress is legal, how much ceiling you actually have. We sort all that out first, pull the permits with your village, and hand you a schedule before demo day. Then we build the room you actually wanted — and nothing gets framed over until it's been signed off.

Typical range: $45,000–$90,000 · $90,000–$150,000+ with bed & bath
Permits: Pulled and managed by us
Egress: Required for a legal bedroom
Warranty: Workmanship, in writing

Ranges are typical for our Chicagoland projects — see full cost breakdowns. Your itemized estimate is free.

What We Offer

Moisture & waterproofing

Diagnosing where water actually comes from before anything is framed — drainage, sump, vapor barrier and insulation detailing.

Egress windows

Cutting and permitting a code-compliant egress window and well, which is what makes a basement bedroom legal rather than just finished.

Full baths & wet bars

Below-grade plumbing including ejector pumps where gravity drainage is not available.

Framing, insulation & drywall

Built to maintain required ceiling height and clearances around beams, ducts and service panels.

Electrical & HVAC

Circuits, lighting layout, and heating and cooling extended properly rather than bled off an existing run.

Flooring & finish

Floor assemblies chosen for below-grade conditions, plus trim, doors and built-ins.

Our Process

Process

The same six stages on every job — free in-home estimate through warranty.

Free in-home estimate

Greg or Patryk — the owners, not a salesperson — walk your space, take real measurements, and give you honest feedback on what your budget buys.

Itemized scope & contract

Labor, materials, demolition and disposal priced line by line, not one mystery number. Payment terms and warranty are in the written contract.

Design & selections

Bring your own designer, use our architects and designers, or choose everything yourself. Selections are scheduled ahead so lead times never stall the site.

Permits & scheduling

We pull and manage building, plumbing and electrical permits with your village — typically 1–2 weeks — and hand you a written schedule before demo day.

The build, owner-supervised

Long-standing trade partners working in sequence under daily owner supervision. Your client portal shows the schedule, change orders and current balance.

Walkthrough & warranty

We walk the finished job together, close out every punch-list item, hand over manufacturer paperwork, and your written workmanship warranty starts. Our commitment never expires.

What’s Included

Labor & installation we include

Framing, insulation, drywall, paint and trim
Electrical, lighting and HVAC extension with permits
Egress window cutting and installation where required
Bathroom and wet-bar plumbing including ejector pump
Flooring and finish carpentry
Final walkthrough, punch list and warranty paperwork

You supply / quoted separately

Finish materials — flooring, tile, cabinetry, plumbing and lighting fixtures, doors and hardware
Foundation repair or exterior drainage work, quoted separately if needed

You choose and purchase the finish materials; we specify what is needed, schedule it against the build, and install it. Listed openly so nothing on your final invoice is a surprise.

Testimonials

Your Neighbours Love Us

Real reviews from homeowners. Ask us for live phone references.

Read full review All 71 reviews

Basement Remodeling by City

Find local basement remodeling contractors in your Chicago suburb.

Palatine Arlington Heights Chicago Inverness Barrington Hoffman Estates Lake Zurich Long Grove Mount Prospect Prospect Heights Western Springs Barrington Hills Buffalo Grove Deer Park Deerfield Des Plaines Elgin Elk Grove Village Elmwood Park Evanston Forest Lake Forest Park Fox River Grove Glencoe Glenview Great Lakes Green Oaks Gurnee Harwood Heights Hawthorn Woods Highland Park Indian Creek Kenilworth Kildeer Lake Barrington Lake Bluff Lake Forest Libertyville Lincolnshire Lincolnwood Melrose Park Morton Grove Mundelein Niles Norridge North Barrington Northbrook Northfield Northlake Oak Park Park Ridge Port Barrington River Forest River Grove Riverwoods Rolling Meadows Rosemont Schaumburg Schiller Park Skokie South Barrington Streamwood Vernon Hills Wheeling Wilmette Winnetka

How much does basement finishing cost?: Finishing a basement in the Chicago suburbs typically runs $45,000–$90,000, or $90,000–$150,000+ once you add a bedroom and full bath — driven by square footage, layout, finishes, and whether you need egress windows or below-grade plumbing. GS Construction provides a free, itemized estimate broken down by phase.
How long does basement finishing take?: A typical basement finish takes 6–12 weeks. Waterproofing, framing, electrical, and plumbing are the longest phases. Adding a full bathroom or wet bar adds 1–2 weeks. We work to minimize disruption to your daily life.
Do I need permits to finish my basement in Illinois?: Yes — Illinois municipalities (Arlington Heights, Palatine, Hoffman Estates, Schaumburg, etc.) all require building, electrical, and plumbing permits for basement finishing. GS Construction handles all permitting and inspections for you.
Can you add a bedroom or bathroom in my basement?: Yes. Basement bedrooms require code-compliant egress windows, and bathrooms require proper plumbing tie-ins (often with an ejector pit). We handle the engineering, permits, and full build.
What about moisture and water in the basement?: Before any finishing, we assess your basement for moisture intrusion. We can install vapor barriers, sump systems, drain tile, and proper insulation to ensure your finished space stays dry and mold-free.

Ready to Finish Your Basement?

Get a free consultation and quote for your remodeling project. GS Construction is ready to bring your vision to life.

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Kitchen Remodeling Bathroom Remodeling Home Additions Whole-Home Remodeling Mudroom Remodeling

Basement Finishing & Remodeling