Basement Finishing Cost · 2026
What finishing a basement costs near Chicago
A finished basement in the Chicago suburbs typically runs $45,000–$90,000 for a standard build-out, and $90,000–$150,000+ when adding a full bathroom, wet bar, or home theater. Egress windows and waterproofing are quoted separately.
Typical price tiers
| Tier | Range | What that buys |
|---|---|---|
| Standard build-out | $45,000–$90,000 | Framing, insulation, drywall, flooring, lighting, and an open rec-room layout |
| Full lower level | $90,000–$150,000+ | Adds a full bathroom, wet bar or kitchenette, home theater, guest bedroom with egress |
What moves the number
Adding a bathroom
Below-grade plumbing (and sometimes an ejector pit) makes the basement bath the biggest single add.
Egress windows
Required for legal bedrooms — excavation plus the window itself, quoted separately.
Moisture control
Drain tile, sump work, and waterproofing are prerequisites we scope before finishes — also quoted separately.
Ceiling treatment
Drywall vs drop ceiling, and how much ductwork rerouting the layout needs.
Timeline
Standard build-outs typically run 6–9 weeks depending on scope; adding a bathroom extends the plumbing and inspection sequence. See the full GS process step by step, or how homeowners pay for a remodel.
Basement Finishing Cost — common questions
- How much does it cost to finish a basement near Chicago?
-
A finished basement typically runs $45,000–$90,000 for a standard build-out, and $90,000–$150,000+ when adding a full bathroom, wet bar, or home theater. Egress windows and waterproofing are quoted separately.
- Does a basement bedroom need an egress window?
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Yes — building codes require egress for legal basement bedrooms. Egress excavation and installation are quoted as their own line so the core build-out price stays clear.
Want your exact number?
Free in-home estimate with an itemized scope — real figures for your actual space, not a range.