Franklin prices basement work by the square foot, and its 2026 permit packet says so in writing.
Franklin's 2026 alteration packet
Fees for interior alterations, including basement build-outs and specialty rooms, are based on the square footage of the work area [1]. The packet lists a $90 plan review, $0.45 per square foot with a $165 minimum, a $10 technology fee and a $65 occupancy fee where it applies [1]. Contractors attach copies of their Dwelling Contractor and Dwelling Contractor Qualifier certifications. Owners who own and live in the home don't need them [1].
Do I need a permit to finish a basement in Franklin?
Yes. The 2026 addition and alteration packet covers basement build-outs and bases the fee on the square footage of the work area [1].
Who does the plumbing and electrical?
Licensed contractors do plumbing, electrical and heating under their own permits. The packet says building permits don't include that trade work [1].
Next steps
Next, try what finishing costs, adding a bathroom or egress windows and bedrooms. Neighbors with their own pages: Milwaukee and Wauwatosa. For statewide rules, read how it works; for every town, service areas.
Ask for a quote on your Franklin basement project.
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Sources
- 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