Basement finishing, Chicago and the near suburbs
The cheapest room you will ever add, and the easiest one to get wrong.
Chicago sits on clay with a high water table. If the water is not solved first you are finishing a room that will rot. We solve it first, in writing, before a single stud goes up.
7 ftFinished ceiling Chicago needs
6 ft 4Ducts and beams may drop to
5.7 sq ftClear opening for a bedroom
Two pitsSewage and drain tile, never one
01 / Feasibility
Before anybody talks about finishes
Three things decide whether yours can be finished.
Not the flooring. Not the paint colour. These three, in this order, and all of them are answerable in twenty minutes standing in your basement with a tape measure.
Gate 01
Water
Chicago clay holds water against your foundation and pushes it up through the slab at the cove joint, not just down the wall. Sealing the inside of the wall does nothing about that.
What we look for
Efflorescence, a stained cove joint, a sump that runs in dry weather, and whether there is drain tile at all.
If it is wet
Drain tile and a pit go in before framing. It is a five figure line on a full perimeter and it is not optional.
Before you decide you are fine
Between 2007 and 2016 the City of Chicago recorded 229,743 paid flood damage insurance claims, across 56 of the 59 ZIP codes that touch the city. Not being in a FEMA flood plain is not the same as not flooding. Center for Neighborhood Technology
Gate 02
Headroom
Chicago wants 7 feet from finished floor to finished ceiling in a habitable room. Finished, not bare slab to joist. Flooring and ceiling eat several inches before you start.
The part nobody tells you
Ducts, beams and girders may drop to 6 feet 4 inches inside a dwelling unit, and a bathroom or laundry room only needs 6 feet 8 inches. That is why most bungalows need the ducts boxed, not moved, and why the bathroom often goes under the lowest part of the ceiling.
If you are short
Underpinning or bench footing buys depth, and it turns a finish into a structural job. We say so before you fall in love with a layout.
Gate 03
Egress
A basement bedroom without an escape opening is a den. A den does not count in the listing, will not appraise as a bedroom, and will not pass inspection.
The numbers
5.7 square feet of net clear opening, at least 24 inches high, at least 20 inches wide, sill no more than 44 inches off the floor. Below grade openings can come down to 5.0 square feet where the adopted code allows it.
And the well
At least 9 square feet with a 36 inch projection, and a permanent ladder if it is deeper than 44 inches. The well is usually the bigger line.
02 / Scope
What we build
One basement at a time.
Basements only. Not kitchens between basements, not roofs in the slow season. It is the whole business, which is why we know where the water comes in.
The work
Go and look at the whole lot.
Every basement, what it started as, what went in behind the walls, and how long we were in the house. And the permit record you can check yourself.
The question nobody answers
Read my basement.
Six questions about your actual basement. You get the code issues you are facing, how long it takes, what needs a permit, and a price band that narrows as you answer. It starts wide on purpose, because right now we know nothing about your house.
Not a number yet
The reading0 of 6 answered
Not a number yet
lessmore
Answer the first question and this starts to tighten.
What you have already read somewhere else
Every number you have found tonight is for a different basement.
These are real published figures, with the source, so you can see how wide the field is before anyone quotes you. None of them is a price for your house.
Figures as published by those sources and checked in September 2026. We have not adjusted them.
The work
Basements, and how to check us.
Photographs are easy to borrow, so the part nobody can borrow is further down this page: our permit record, on the City of Chicago's own public database, which you can search yourself in about ninety seconds.
Want the part that cannot be faked?
How it works
Five steps, and the water is step one.
One project lead from the first visit to the last, and a written schedule you can hold us to.
01
Read it
We measure floor to joist, look at the cove joint, find the sump, check where the stack and the main are, and tell you what you are actually dealing with.
You getA straight answer, free
02
Dry it
If it takes water, that gets solved and signed off before anything else is priced. Drain tile, a pit, a backup pump, an overhead sewer if it needs one.
You getA dry basement, in writing
03
Scope it
A written scope, line by line, with the ejector pit, the egress well and the allowances named rather than buried. Then a fixed price.
You getA price that does not move
04
Permit it
Pulled in our name, with the city or your village. Inspections booked. Smoke and CO alarms brought up to current code across the house, because the permit puts them in scope.
You getA dated start
05
Build it
Dust wall at the stair, floor protection on the path, one crew, cleaned at the end of every day. We walk the punch list with you before the last payment.
You getSigned permits and your warranty
What you leave the walkthrough with
A straight answer on water, height and egress, before anyone asks you for a design fee.
Do not take our word for it
Every permit we pull is public record.
Reviews can be bought. Photographs can be borrowed. A permit record cannot be either, and Chicago publishes all of them for free.
The City of Chicago publishes every building permit issued since 2006 as a free, daily updated dataset, and the record includes the contractor names on the job.
01
Open the Chicago Data Portal building permits dataset, linked opposite. It is free and needs no account.
02
Filter on contractor name, or search an address on a street where you have seen our van.
03
Read the work description, the date and the address. That is the job as the City recorded it, not as we described it.
04
If you are in a suburb, ask your village for the same thing. Every one of them keeps the record, and we will give you the addresses to look up.
One more thing worth knowing, because almost every contractor page in this city gets it wrong: Illinois does not license general contractors at state level. There is no state licence to hold, so the phrase licensed and insured, on its own, tells you nothing. What is real is a City of Chicago contractor licence with its class, and a certificate of insurance with a named insurer. Ask us for both. Ask the other two as well.
Chicago Data Portal, Building Permits, dataset ydr8-5enu. Opens on the City's own site.
In their own words
Ask the neighbours.
Every review links to where it was posted, so you can read it on the platform rather than on our own website. Inventing one has been a federal matter since the FTC review rule took effect in October 2024, and we would rather have three real ones than thirty we made up.
Questions
What Chicago homeowners ask first.
Straight answers, with the code section behind them.
Where we work
How low can my ceiling be?
Chicago requires 7 feet of clear height in a habitable room, measured from the finished floor to the finished ceiling. Bathrooms and toilet rooms may be 6 feet 8 inches. The number that matters is the one after flooring, furring and any dropped ceiling, not the one you get off the bare slab.
The useful part is the exception: ducts, beams and girders inside a dwelling unit may come down to 6 feet 4 inches. That is why a bungalow that fails on paper often only needs the duct run boxed into a soffit rather than the whole system rerouted. If anyone tells you every duct has to move, ask them why.
Does a finished basement add square footage to my house?
Not in the appraisal. Under ANSI Z765-2021, the measurement standard appraisers use, a level that is wholly or partly below grade is not counted in Gross Living Area. If any part of a level is below ground, even by inches, the whole level is below grade.
What it does add is living space, and the 2025 Cost vs Value report put a midrange basement remodel at about 71 percent cost recouped at resale. Anyone telling you a basement adds square feet to your listing is telling you something an appraiser will not agree with.
Why does a basement bathroom cost so much more than an upstairs one?
Because the floor is below the sewer main, so gravity is not available. Waste has to go into a sealed, vented pit cut into your slab and be pumped up by an ejector. That is concrete cutting, excavation, a gas tight lid, a vent tied back into the stack and a dedicated circuit.
And it cannot share your existing sump. Code does not allow sewage and subsoil drainage in the same pit, so a below grade bathroom means a second pit. If a bid shows you a bathroom and no ejector pit, that is not a cheaper bid, it is an incomplete one.
What makes a basement bedroom legal?
Worth knowing first: a finished basement needs an escape opening whether or not anyone sleeps down there. Every sleeping room then needs its own on top of that. The only exception is a basement of 200 square feet or less that holds nothing but mechanical equipment.
The opening needs 5.7 square feet net clear, at least 24 inches high, at least 20 inches wide, with a sill no more than 44 inches above the floor. Net clear means the hole a body actually fits through with the sash open, not the rough opening. Below grade it also needs a well of at least 9 square feet with a 36 inch projection, and a ladder if the well is deeper than 44 inches.
Do I need to worry about radon?
Worth testing, always, before you turn a space nobody occupied into a space someone sleeps in. The action level is 4.0 picocuries per litre, and Illinois licenses radon measurement and mitigation professionals through IEMA.
Since June 2013 new Illinois homes of one or two units have had to be built with passive radon resistant techniques, so a newer house may only need a fan added to a pipe that is already there. An older Chicago house usually needs the full system. Against a five figure finish it is a small line, and the cheapest serious problem on this list to fix.
Do you pull permits?
Yes, in our name, with the City of Chicago or with your village, and we book the inspections. Suburban requirements differ village by village, which is a real reason to use somebody who has pulled in your town before.
One thing to budget for: pulling a permit for the basement brings smoke and carbon monoxide alarms into scope for the whole house, not just the new rooms. Illinois also requires any newly installed smoke alarm to have a sealed ten year battery unless it is hardwired.
Can you just seal the walls and skip the drain tile?
We will not. An interior sealer is a coating. In Chicago clay the failure mode is hydrostatic pressure coming up through the cove joint and the slab, which a wall coating does nothing about. You would be paying us to hide the problem behind new drywall until it comes through in year two.
If your basement is genuinely dry and has working drain tile, we will tell you that too and we will not sell you a system you do not need.
How long will it take?
A straightforward open finish is usually a few weeks. Add a bathroom and you add the ejector pit and a second round of rough in inspections. Add an egress window and you add excavation outside. Water work, if it is needed, happens first and on its own timeline.
You get a dated schedule before we start, and if something moves we tell you when and why rather than letting you notice.
Is the work warrantied?
Warranty. Manufacturer warranties on materials and equipment are handed to you at the end along with the signed permits and the inspection records.
Free walkthrough
Twenty minutes in your basement.
We measure the height, look at the cove joint, find the sump and the stack, and tell you what you are dealing with. You leave knowing whether it can be done and roughly what it costs, with nothing to sign.