A basement remodel cost depends mostly on size, how many rooms you build and whether plumbing is involved. We haven't found a published Milwaukee or Wisconsin survey of basement prices, so the ranges below are national estimates from HomeGuide and Angi. The local numbers on this page are permit fees from area cities' own fee sheets.
Basement finishing cost per square foot
| What's being done | National range | Source |
|---|---|---|
| Finish an unfinished basement | $30 to $50 per sq. ft.; $15,000 to $75,000 for 500 to 1,500 sq. ft. | HomeGuide [1] |
| Finish, national average | $32,000; most spend $15,000 to $75,000 | Angi, 2026 [2] |
| Remodel an already finished basement | $25 to $65 per sq. ft.; $12,500 to $37,500 | HomeGuide [3] |
| Remodel an already finished basement | $20,000 average; most $4,200 to $45,000 | Angi, 2026 [2] |
| Partial finish | $2,500 to $20,000 | HomeGuide [1] |
Angi also lists $7 to $23 per square foot, but labels that rate for a half-finished basement where only part of the space is done [2]. Don't compare it with a full-finish quote.
HomeGuide's size table shows what walls add. A 1,000 square foot basement is $30,000 to $40,000 with an open plan and $40,000 to $50,000 finished as three rooms [1].
Basement finishing cost by room
| Room or feature | National range | Source |
|---|---|---|
| Bedroom (each) | $3,000 to $12,000 | HomeGuide [1] |
| Living area | $6,000 to $16,000 | HomeGuide [1] |
| Bathroom, converting existing space | $3,000 to $12,500 for 15 to 50 sq. ft. | HomeGuide [4] |
| Sewage ejector pump, if needed | adds $2,000 to $5,500 | HomeGuide [4] |
| Kitchenette | $5,000 to $20,000 | HomeGuide [1] |
| Prefabricated wet bar | $2,000 to $12,000 | HomeGuide [3] |
| Egress window, installed | $6,000 to $8,000 typical; $4,000 to $12,000 range | HomeGuide [5] |
Remodel or finish: which price applies
Finishing starts from bare walls and slab. Remodeling reworks a space that's already finished, and Angi says wet additions such as a laundry room or kitchenette push a remodel toward the high end because of the plumbing [2]. A remodel can also uncover old work that has to come out. West Allis code, for example, says unpermitted work may have to be opened up for inspection at the owner's expense [6].
What drives the price
- Size and rooms. HomeGuide says an open floor plan can save thousands in lumber, drywall and insulation [1].
- Plumbing. Bathrooms, bars and kitchenettes add fixtures, venting and sometimes an ejector pump [4].
- Heating and electrical. HomeGuide puts added wiring at $4 to $9 per square foot, and says a finished basement must be heated for its square footage to count as living space [1]. Angi lists HVAC work at $2,000 to $3,000 [2].
- Ceilings and floors. A drywall ceiling is $2 to $4 per square foot and a drop ceiling $4 to $20; carpet runs $2 to $8 per square foot installed [1].
- Egress. A basement bedroom needs a second exit, and an egress window is one way to provide it [7].
- Headroom. If the ceiling is too low, lowering the floor costs $50 to $100 per square foot [3].
Local factors: permit fees in area cities
National guides disagree on permits. HomeGuide puts a basement finishing permit at $200 to $1,000 [1], while Angi says $1,200 to $2,000, and both mention fees of 1% to 2% of project value [1, 2]. Here's what some local fee sheets say:
- Brookfield (2026): alteration permit $0.47 per square foot, $80 minimum, plus $131.25 plan review [8].
- Franklin (2026): $90 plan review, $0.45 per square foot with a $165 minimum, a $10 technology fee, and a $65 occupancy fee where it applies. Basement build-outs are priced by the square footage of the work area [9].
- Muskego: for remodels with no footprint change, $25 planning review, $75 building review, engineering review from $23.75, and $0.44 per square foot with a $300 minimum. Trade permits add a $70 base plus $0.08 per square foot [10].
- Oak Creek: residential remodel, $60 permit plus $90 plan review [11].
- Wauwatosa: cost depends on project size and cost, and the city's online portal has a permit cost estimator [12]. Work started on site before the permit is issued may be charged a double permit fee [12].
- Milwaukee: alterations, remodeling, and repairs are 1.6% of the cost of construction, with a $150 minimum. Plan exam is $0.25 per square foot of the total affected area, with a $125 minimum. A 1.6% training and technology surcharge applies to each permit fee, plus a $20 processing fee. Where construction is started, or when a premises is occupied, without first obtaining a permit, the fees specified in this section may be quadrupled. The one- and two-family section of the city's fee schedule has no printed effective date, so confirm the current fee with Plan Exam & Permits at 414-286-8210 [13, 14].
Starting early can cost more. South Milwaukee charges triple fees when work starts before approval [15], and Whitefish Bay charges four times the fee for skipping permits [16].
What a finished basement may return at resale
The National Association of Realtors' 2025 Remodeling Impact Report puts basement conversion to living area at about 71% of cost recovered. That figure is national. The report does not give a dollar cost or a Milwaukee breakdown [17].
How to compare quotes
- Get at least two quotes for the same floor plan and finish list.
- Ask for line items: framing, insulation, electrical, plumbing, HVAC, ceiling, flooring, doors and trim, and permits.
- Ask who pulls the permits, and get the contractor's DC and DCQ numbers, which DSPS requires for a building permit on a house or duplex [18].
- Check what's excluded, such as an egress window, an ejector pump or furnace changes.
- Compare the per square foot math against the national ranges above, keeping in mind they aren't local prices.
Basement cost FAQs
How much does it cost to finish a 1,000 square foot basement?
HomeGuide's national table puts it at $30,000 to $40,000 with an open plan, or $40,000 to $50,000 with three rooms [1].
Is remodeling cheaper than finishing?
Often, per square foot. HomeGuide's remodel range starts at $25 per square foot versus $30 for finishing [3, 1], but adding a bathroom or bar can change that.
Are permit fees included in a quote?
Ask. Angi says most contractors include permit costs in their package [2], but local fees vary, as the list above shows.
Is there a Milwaukee price survey?
Not one we've found. No published source we know of surveys what Milwaukee homeowners paid to finish a basement, so every per-square-foot and room range on this page is a national estimate from HomeGuide or Angi [1, 2].
Request a quote with your basement's size and what you'd like to build.
We're a referral service, not a contractor, and independent contractors may pay us for referrals.
Sources
- HomeGuide, "How Much Does It Cost to Finish a Basement? (2026)," byline Feb 6, 2026. https://homeguide.com/costs/cost-to-finish-a-basement
- Angi, "How Much Does It Cost to Finish a Basement? [2026 Data]," Rachel Hoffman, updated Oct 29, 2026. https://www.angi.com/articles/how-much-does-it-cost-finish-basement.htm
- HomeGuide, "How Much Does a Basement Remodel Cost? (2026)," Jennifer Carlson, Feb 6, 2026. https://homeguide.com/costs/basement-remodel-cost
- HomeGuide, "How Much Does It Cost to Put a Bathroom in the Basement? (2026)," Jennifer Carlson, Feb 6, 2026. https://homeguide.com/costs/cost-to-put-bathroom-in-basement
- HomeGuide, "How Much Does Egress Window Installation Cost?," byline Oct 22, 2025. https://homeguide.com/costs/egress-window-installation-cost
- City of West Allis Code 13.05, Permits. https://westallis.municipalcodeonline.com/book/print?name=13.05_Permits&type=ordinances
- Wis. Admin. Code SPS 321.03, Exits (Register November 2024 No. 827; fetched Nov 11, 2026) https://docs.legis.wisconsin.gov/code/admin_code/sps/safety_and_buildings_and_environment/320_325/321/ii/03
- City of Brookfield, Residential Building Permit Fees as of January 1, 2026 (PDF) https://www.ci.brookfield.wi.us/DocumentCenter/View/24944
- City of Franklin, One & Two Family Addition/Alteration Permit Applications (PDF, 2026) https://www.franklinwi.gov/Files/Inspection/One-and-Two-Family-Addition-Alteration-Permit-Application-2026.pdf
- City of Muskego, Building Inspection Fees. https://muskego.wi.gov/departments/community_development/building_inspection/fees.php
- City of Oak Creek, Building Permit Application (PDF) https://www.oakcreekwi.gov/DocumentCenter/View/1697/Building-Permit-Application-General-PDF
- City of Wauwatosa, Building Permit Basics (PDF, updated 11/2025) https://wauwatosa.gov/wp-content/uploads/2026/08/Building-Permit-Basics-UDC.pdf
- City of Milwaukee DNS, Plan Review and Permit Fee Schedules (no effective date printed on the one- and two-family section; fetched Nov 11, 2026) https://city.milwaukee.gov/ImageLibrary/Groups/dnsAuthors/permits/Documents/DevCenterFeeCombo.pdf
- City of Milwaukee DNS, Does It Need a Permit? (fetched Nov 11, 2026) https://city.milwaukee.gov/DNS/permits/PermitChecklist
- City of South Milwaukee, Building Permits. https://www.southmilwaukee.gov/196/Building-Permits
- Village of Whitefish Bay, Permits. https://www.wfbvillage.gov/330/Permits
- National Association of Realtors, 2025 Remodeling Impact Report (PDF, April 9, 2025), basement conversion to living area at 71% cost recovery (fetched Nov 11, 2026) https://www.nar.realtor/sites/default/files/2025-04/2025-remodeling-impact-report_04-09-2025.pdf
- Wisconsin DSPS, Dwelling Contractor Qualifier (DCQ), Building Permit Requirements (fetched Nov 11, 2026) https://dsps.wi.gov/a-z-professions-list/dwelling-contractor-qualifier-dcq/