Waukesha has a city web page just for basement remodels, and it reads like a checklist you can hand to whoever draws your plans.
Waukesha's basement remodel page
Contractors apply through a city AEC account and show two state credentials, the DC and the DCQ. The DCQ can be held by someone on the payroll [1]. A homeowner may apply only for the address where they live, through a public ETRAKiT account, and signs a Cautionary Statement to Property Owners [1]. Plans include an existing basement floor plan and a proposed one showing room uses, wall and ceiling finishes, egress window details, alarm locations, plumbing fixtures and ventilation [1].
Do I need a permit to finish a basement in Waukesha?
Yes. The city requires an alteration building permit, and only licensed plumbing and electrical contractors may get those trade permits [1].
Does the basement need a carbon monoxide alarm?
The page says a listed CO alarm with battery backup goes in the basement, outside each sleeping room and in common areas. The rule doesn't apply to a home with no attached garage, fireplace or fuel-burning appliance [1].
Next steps
Next, try full basement finishing, ceiling height and layout or egress windows and bedrooms. Neighbors with their own pages: Brookfield and Wauwatosa. For statewide rules, read how it works; for every town, service areas.
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Sources
- City of Waukesha, Residential Basement Remodel (fetched Nov 11, 2026) https://www.waukesha-wi.gov/government/departments/residential-basement-remodel.php