Building permits, zoning and septic rules in Columbia County, Wisconsin

Yes. Wisconsin's Uniform Dwelling Code applies statewide to new one- and two-family dwellings, and construction may begin only after plans are approved and the building permit is issued and posted¹. Cities, villages and towns generally handle construction permits and inspections when they have delegated authority; the responsible authority can differ by municipality^1,7. Most Columbia County towns listed in the county permit guide use General Engineering Co. for the town building permit and Uniform Dwelling Code inspection⁸. The county zoning permit is not a substitute for the building permit, which the affected town issues³. Building permit rules for additions and alterations vary by municipality, so ask the town or its inspector before starting that work⁹.

The building-permit contact depends on the municipality, because Wisconsin cities, villages and towns generally exercise jurisdiction over new-home construction and inspection when authorized¹. Columbia County's permit guide lists General Engineering Co. at (608) 742-2169 for the town building permit and Uniform Dwelling Code inspection in most county towns⁸. Columbia County Planning & Zoning, at 112 E. Edgewater Street, Portage, WI 53901, handles the separate county zoning permits and sanitary (septic) permits; call (608) 742-9660 or email planning.zoning@columbiacountywi.gov^4,10. The county warns applicants that other federal, state, county, town or local approvals may also be required, so identify every permitting authority before filing¹⁰.

It depends on the town. Columbia County's general zoning ordinance applies only in the portions of unincorporated Columbia County where the town board adopted it; cities and villages are outside that jurisdiction, while floodplain and shoreland-wetland rules may apply independently². A town outside county zoning may be unzoned or administer its own ordinance¹¹. Where county zoning applies, the official map divides land into districts with different standards². For example, the county table sets a five-acre minimum for agricultural use or vacant land and a one-acre minimum for a preexisting residence in the A-1 and AO-1 districts; other districts differ, including 1 acre in A-2 and A-3 and 20,000 square feet in RC-1². Where county zoning applies, a county zoning permit is decided in writing within 30 days of a complete application unless a parallel process such as a conditional use permit takes longer³. A limited zoning-permit exception covers agricultural structures that are nonhabitable, readily removable, not permanently affixed, outside the shoreland zone, and not a roadside stand or sign².

A county sanitary permit is required before a private sewage system is installed, replaced, reconnected or modified anywhere in Columbia County, including inside the cities and villages, and the application goes through Columbia County Planning & Zoning³. The permit expires two years after issuance if the system is not installed and approved³. A building permit for a new dwelling using private onsite wastewater cannot be issued until the sanitary permit has been issued⁹. The county publishes sanitary-permit fees, while the amount depends on the applicable fee listing and project⁴. Soil suitability deserves early attention: only about 6.9% of Columbia County soils rate free of severe limits for a conventional drain field, so get the site evaluated before finalizing the house location or budget⁵. Under the county ordinance, every septic tank must be visually inspected or pumped within three years of installation and at least every three years after that, unless an inspection finds less than one-third of the tank occupied by sludge or scum¹².

We could not confirm a Columbia County rule that generally allows long-term RV or tiny-home occupancy on a private lot; ask Planning & Zoning for zoning questions and the town that governs the parcel for its building permit¹⁰. In a county-regulated campground, the same party may not occupy one camping unit for more than six continuous months in any twelve-month period, and state rules may shorten that period². That campground rule does not establish permission to live in an RV elsewhere. County-regulated mobile or manufactured home parks impose a minimum thirty-day site-rental period and require homes to be used as dwellings and skirted². A new manufactured-home installation is also covered by the statewide Uniform Dwelling Code; occupancy follows a final inspection without major health or safety violations^1,9.

1. Ask Columbia County Planning & Zoning which zoning jurisdiction and district cover the parcel, then check floodplain and shoreland constraints^2,10.
2. Get the soil evaluated and secure the county sanitary (septic) permit before seeking the town building permit for a home using private sewage^9,12.
3. Obtain access approval from the road authority; a county-highway driveway permit covers construction, repair or improvement, while WisDOT permits state-highway connections^13,14.
4. Where county zoning applies, submit the county zoning permit application with the form, owner signature, deed or legal description, and review fee¹⁵.
5. Allow for a written zoning decision generally within thirty days; parallel reviews can take longer¹⁵.
6. File the Uniform Dwelling Code building permit application with the responsible town or inspection agency after prerequisite approvals^8,16.
7. Schedule inspections before work is covered and occupy only after a satisfactory final inspection⁹.

Confirm the parcel's town and zoning authority before relying on a proposed use, lot size or setback^2,10. Near navigable water, buildings and structures generally must be at least seventy-five feet from the ordinary high water mark, subject to listed exceptions and setback averaging¹⁷. Check floodplain status early with Planning & Zoning, since county floodplain rules require standards to be met and permits issued before floodway or floodfringe development³. Statewide, new structures, wells and sewage systems are prohibited in the floodway, while floodfringe construction has elevation and access requirements¹⁸. Septic suitability is another purchase-stage issue because only about 6.9% of county soils rate free of severe limits for a conventional drain field⁵. For a new private well, Wisconsin generally requires a Well Construction Notification Number before drilling, and some approved county ordinances can add a permit¹⁹. Finally, match the driveway approval to the road owner before assuming legal access^13,14.