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HomePermit guide

Window Permits in Wisconsin

The short version: the state code and your city's ordinance are two different questions, and only your local building department can answer the second one. We will not tell you that you do not need a permit, because that is not ours to say.

On this page
  1. What the state says
  2. "Equivalent units" is doing a lot of work
  3. Who decides, and how to ask
  4. Historic districts and condominiums
  5. Who should pull it
  6. What we are not telling you
  7. Next
  8. Sources

What the state says

Wisconsin DSPS has published guidance in its Uniform Dwelling Code Repair Credential FAQ. Three points from it matter here [W4]:

  1. Replacing windows or doors with equivalent units is a "repair."
  2. Repairs are exempt from the Uniform Dwelling Code, under SPS 320.05(3).
  3. A municipality may still require a building permit for a repair by ordinance, under SPS 320.09(2)(b)1.

So the state code's own requirements do not attach to a like-for-like swap, and your city's ordinance may still require a permit anyway. Point three is the one that decides your job.

One related point from the same guidance: dwelling contractor credentials are required only where a permit under SPS 321 or 322 is required, so a municipality cannot require those credentials for a repair [W4]. That is a rule about credentials, not about permits, and it does not mean a permit is not required.

"Equivalent units" is doing a lot of work

The state's framing turns on replacing windows with equivalent units [W4]. If the job is not that, the repair analysis may not apply at all. Treat these as different jobs and confirm each one locally:

  • Enlarging or reducing an opening, or cutting a new one.
  • Changing a window's operation in a way that affects egress, for example replacing an operable bedroom window with a fixed picture unit.
  • Anything involving bedroom egress. Egress window requirements exist for escape and rescue, and they are not something to work out from a web page. Confirm them with your building department before you order.
  • Structural work, such as changing a header or altering a load path.
  • Glass block, basement window changes, or converting a window to a door or vice versa.

Who decides, and how to ask

Your municipal building or inspection department decides whether a permit is required for your job, in your city, this year. Ordinances differ between neighbouring municipalities, and city and town jurisdictions with the same name are separate authorities.

Call them before you order and ask, in these words:

  1. "I am replacing windows in an existing single-family home with the same size and type of unit. Does your ordinance require a building permit?"
  2. "Does the answer change if the opening size changes, or if it is a bedroom window?"
  3. "Is the property in a historic district, or individually designated, and does that add a review?"
  4. "Who pulls the permit, me or the contractor, and what is the fee?"

Write down who you spoke to and when.

Our metro pages point to each city's building department: Milwaukee, Madison, Green Bay, Appleton, Oshkosh, Racine and Kenosha, Eau Claire, Wausau.

Historic districts and condominiums

Two extra layers that have nothing to do with the building code:

Historic designation. Local historic district rules and individual landmark designations can govern what a replacement window may look like, down to materials, muntin pattern and profile. These are administered locally and are separate from the permit question.

Condominium and homeowners' association rules. If you are in a condominium, the association's documents usually control the exterior, and windows are often common elements. Check before you sign anything.

Who should pull it

Either you or your contractor can usually pull a permit, where one is required, but it is not a neutral choice. A permit pulled in the homeowner's name can shift responsibility for code compliance onto the homeowner. Ask the contractor to pull it in their name, and be wary of one who insists you do it. Make it explicit in writing who is responsible for the permit and for any inspection that follows.

What we are not telling you

We are not telling you a permit is not needed. We are not telling you one is. We are telling you that the state treats a like-for-like swap as a repair exempt from the UDC [W4], that your municipality can require a permit regardless [W4], and that you should ask them.

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Sources

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