Decorah, IA Zoning, Building Permits & Septic Rules

Decorah, Iowa requires building, plumbing, mechanical and septic & well permits inside city limits¹². The city also has its own zoning under Title 17 of the Decorah code³. Septic permits are submitted with the city building permit application, but we could not confirm which office issues them, so also ask Winneshiek County Environmental Health²⁴.

At a glance

Building permit: Required inside Decorah for building, mechanical, plumbing and electrical work¹
Zoning: Yes, city zoning in Title 17 of the Decorah code³
Septic and well permits: Submitted with the city building permit application⁵⁶
R-1 minimum lot: 10,000 sq ft and 90 ft wide⁷
R-1 setbacks: Front 10 ft, side 8 ft, rear 5 ft⁸
Accessory dwellings (R-1): Allowed on the same lot, up to 1,000 sq ft or 50% of the house⁹

Who to call

Building permits

City of Decorah Building Code and Inspections

Building, plumbing, mechanical and septic & well permit applications inside Decorah; building inspections

(563) 382-3651

400 Claiborne Dr. Decorah, Iowa 52101

Septic permits

Winneshiek County Environmental Health

Septic permits and inspections, well permits and inspections, and well testing for Winneshiek County

563-387-4120

201 W. Main Street, Decorah, IA 52101

Contact details are copied from each office’s official page and were checked against it on October 23, 2026.

Off-grid gear

Going off-grid in Decorah means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Decorah, Iowa?

Yes. Inside Decorah city limits, permits for building, mechanical, plumbing and electrical work are required before work starts¹. Work the city code specifically exempts does not need a permit¹. Decorah's code adopts the Iowa-adopted international building and residential codes by reference, as amended by the state¹⁰.

A Decorah permit lapses if work does not begin within 180 days, or if work is suspended for 180 days¹. Electrical permits and inspections go through the State of Iowa rather than the city².

Who issues building permits in Decorah, and how do you reach them?

The City of Decorah Building Code and Inspections office takes building permit applications inside the city; call (563) 382-3651 or visit 400 Claiborne Dr.². Building permit fees follow a fee schedule the Decorah City Council adopts by resolution, and the city's page links that schedule¹¹.

This is not the county planning counter. Winneshiek County Planning and Zoning serves unincorporated land only, so a lot inside Decorah does not go there¹².

Does Decorah have zoning, and what does it mean for lot size, setbacks and accessory dwellings?

Decorah has its own zoning, found in Title 17 of the city code³. Rules vary by district, and we reviewed only the R-1 Single-Family Residential District, which is meant for low-density areas of single-family homes³.

In R-1, a lot needs at least 10,000 square feet and 90 feet of width⁷. Setbacks are 10 feet in front, 8 feet on each side and 5 feet in the rear⁸. Buildings may cover at most 40 percent of a lot¹³, and the principal building and any accessory dwelling may be up to 35 feet tall¹⁴. The main body of a principal building must be at least 24 feet in its smallest dimension, on a permanent perimeter foundation¹⁵.

An R-1 accessory dwelling unit must share a lot with a single-family residence and may not exceed 1,000 square feet or 50 percent of the residence, whichever is larger⁹. Short-term and long-term rentals are listed R-1 uses¹⁶. Other districts were not reviewed, so check the city zoning map for your parcel.

How do septic permits work inside Decorah?

Decorah's building permit page says separate septic & well permits must be submitted with the building permit application before permits are issued⁵. We could not confirm whether the city or the county issues the septic permit inside city limits, or what the inspection steps are, so ask the City of Decorah Building Code and Inspections office first².

Winneshiek County Environmental Health handles septic permits and inspections, and well permits and inspections, for the county¹⁷⁴. We could not confirm the city's sewer and water connection rules, so ask the city before assuming a septic system is allowed on a given lot.

Can you live in an RV or tiny home in Decorah?

We could not confirm Decorah's rules on living in an RV, camping on a lot, or occupying a tiny home. A tiny home built on a foundation would be treated as a principal building or accessory dwelling under the R-1 rules above, including the 24-foot minimum dimension¹⁵. Call the City of Decorah Building Code and Inspections office at (563) 382-3651 before parking or occupying any RV or small structure inside city limits².

Building a home in Decorah: the steps, in order

Find your parcel's zoning district on the city zoning map and check lot size, setbacks and coverage against Title 17³.
Call the City of Decorah Building Code and Inspections office at (563) 382-3651 for the permit forms and fee schedule².
Submit the building permit application together with separate plumbing, mechanical and septic & well permits⁵.
Build to the adopted state-amended codes, and start within 180 days or the permit lapses¹⁰¹.
Arrange electrical permits and inspections through the State of Iowa².

What stays with Winneshiek County, and what to check before you buy

Land outside Decorah city limits is governed by the county. In unincorporated Winneshiek County a residential building permit is required, issued by the county zoning office¹⁸, and the county's zoning rules apply to areas outside incorporated municipalities¹⁹. The Winneshiek County page covers that land.

For context, Winneshiek County's effective property tax rate is 1.2 percent and the median property tax bill is $2,784 per year²⁰²¹. Floodplain construction inside Decorah defers to separate state and local floodplain ordinances we did not review, so ask the city about flood zones before you buy²².

Watch-outs

We could not confirm who issues septic permits inside Decorah, so call the City of Decorah Building Code and Inspections office and Winneshiek County Environmental Health before you buy²¹⁷.
We could not confirm Decorah's rules on RV living, tiny homes, certificates of occupancy or driveway access, so ask the City of Decorah Building Code and Inspections office before you commit to a lot².
Only the R-1 district was reviewed; lots in other Decorah zoning districts follow different standards³.
County rules apply only outside city limits, and Iowa's owner-builder exemption covers contractor registration but is not stated to waive building permits²³.

Sources

Written October 23, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Unanswered questions are usually a sign that Decorah publishes no rule on the point, not that none exists. Winneshiek County’s page lists the county offices to call.

Decorah, Iowa zoning, building permits and septic rules