Plymouth County, Iowa Building Permit Guide

Outside city limits in Plymouth County, the Planning & Zoning office in the Courthouse Annex, 215 4th Ave SE, Le Mars (712-546-7516), issues the land use permit needed before a house or other building goes up, open only Tuesdays and Wednesdays. The permit checks zoning and setbacks, not construction: the county states it takes no responsibility for inspections. A house over $250,000 pays $1 per $1,000 of cost under the fee schedule effective March 3, 2026, and wells, septic systems and driveways each need their own county permit.

What requires a permit in unincorporated Plymouth County?

The zoning ordinance, updated October 24, 2023, covers the unincorporated county. No building or structure may be erected, reconstructed, moved or structurally altered without a zoning permit from the Zoning Administrator, and no land or new building may be occupied or changed in use until the administrator issues a certificate of occupancy. The county’s application form is titled a Land Use Permit and is used for farm, residential, commercial and other projects.

The farm exemption follows the state statute’s wording: no zoning regulation applies to land, farm houses, farm barns, farm outbuildings or other structures primarily adapted, by reason of nature and area, for use for agricultural purposes. Fences, walls and hedges may stand in any yard, but in a required front yard nothing over 2½ feet tall may sit closer than 25 feet to a public right of way, except woven-wire or at least 80% open fencing up to 48 inches; residential-district fences are capped at 6 feet. Trees must stay 40 feet back from the right of way of a county road or state highway.

What the county decides and what the state holds

Plymouth County regulates land use, not construction. Its posted ordinances cover zoning, subdivisions and the floodplain, and they include no building code; the land use permit itself says the county “assumes no responsibility for inspections and/or approval” of construction on the site. Structural, plumbing and mechanical work on a rural building is therefore not inspected by the county, while state rules on energy, electrical permits and trade licensing still apply.

Plymouth County building department: who handles permitting

Zoning Administrator Steven Chapman runs Planning & Zoning, which issues building and zoning permits, makes zoning inspections, handles subdivisions and home businesses, and takes rezoning, variance and conditional use requests to the Planning and Zoning Commission, the Board of Adjustment and the Board of Supervisors. Wells and septic systems go to the County Sanitarian, entrances and work in the road right of way to the County Engineer, and rural addresses to the 911 System Administrator.

Cities in Plymouth County

Each incorporated city handles building and addressing inside its own limits; the county ordinance stops at the city line.

Plymouth County permit types

All permits come from the Planning & Zoning office on paper: the land use permit form asks for the building’s type and use, total cost, dimensions, bedrooms, basement, construction materials, heating and plumbing, and whether any part of the property lies in the federal floodplain, with the map panel number if so. If someone other than the owner applies, the form asks for the landowner responsible for taxes.

Residential permits

A rural house needs the land use permit, a well permit and septic permit from the Sanitarian unless public services are available, an entrance from the County Engineer if the lot needs a driveway, a 911 address, and a state electrical permit. Houses must sit at least 60 feet from a county road right of way and 75 feet from a state road right of way, manufactured homes must be anchored to a 42-inch perimeter foundation, and residential driveways may not exceed a 10% slope. Applications for a zoning compliance certificate include a plot plan in duplicate with lot lines and building locations, and a boundary survey and staking may be required. Expect periodic visits from the zoning or assessor’s office while the work is under way.

Building or remodeling a home here? Alliance handles residential permit filing, so the crew isn't waiting on the counter.

Commercial permits

Commercial and industrial buildings use the same land use permit, priced on cost. Uses listed as conditional need Board of Adjustment approval, rezonings and conditional uses need a dimensioned site plan in 13 copies showing land use and ownership within 500 feet, and subdivisions of four or more lots are allowed only where each lot has direct access to a hard-surfaced road. Wind turbines and communication towers carry their own permit fees, and the Loess Hills and Conservation overlay districts add standards for cutting soil and for borrow pits.

For tenant improvements and new commercial builds, Alliance handles commercial permit expediting through issuance. More on this: commercial building permits explained.

What comes before the building permit

• Zoning. Variances and conditional uses go to the Board of Adjustment and rezonings to the Planning and Zoning Commission and then the supervisors; the county posts its comprehensive plan and zoning map.
• Floodplain. Development in a mapped flood hazard area needs a $100 floodplain development permit under the county’s floodplain ordinance.
• Septic on a sale. The zoning ordinance requires land to have a closed septic system whenever it changes ownership.
• Moratorium. On June 16, 2026 the supervisors approved Resolution 061626-1, a moratorium on data centers and industrial battery facilities effective that day; the supervisors asked the Zoning Commission to work with a consulting firm on rules for those uses, and the minutes give no end date.
• Ordinance update. The supervisors set 10:00 am on October 20, 2026 as the first public hearing for the Plymouth County Zoning Ordinance; the latest minutes the county has posted (October 6) predate it, so ask the office what was decided.

Plymouth County permit costs and fees

Fees come from the Zoning Fee Schedule effective March 3, 2026, which the supervisors amended that day to exempt federal, state, county, city and other local government entities, educational institutions and 28E agreement entities from building permit fees.

Worked examples: a $300,000 house pays $1 for each $1,000 of cost, or $300; a $180,000 house pays the flat $250; a $60,000 machine shed pays $100. Note that a house at $250,000 pays $250 while one at $251,000 pays $251, so the bands meet almost exactly.

Driveway entrances are built by the county at the landowner’s cost under the Entrance Policy dated March 3, 2020: culvert cost plus $500 on a gravel road, plus $750 on a paved road with 66 feet of right of way, and plus $1,250 on a paved road with at least 100 feet of right of way. Surfacing is extra, hauled dirt adds $50 a load, widening an entrance costs the culvert plus $150 to install, and wider-than-standard drives are billed on time and materials. The county’s Access Permit form, which shows no date, prints lower charges ($200, $300 and $425 plus culvert cost), so ask the Engineer which figures apply.

Trade permits and who may pull them

The county pages describe no county electrical, plumbing or mechanical permit, so rural electrical work needs a state electrical permit from DIAL, which also inspects it. Plumbers, electricians and HVAC contractors working in the county hold state licenses, and the county asks only about rough plumbing and heating type on the land use permit form.

• Septic systems. A permit, paid before installation, is needed whenever a new home or septic system is installed. New systems need a site analysis to set the location and amount of leach line; a 1,250-gallon tank is required for a one-, two- or three-bedroom house; distribution boxes must be plastic; and a map of the finished system goes to the Sanitarian for the county’s file. The county enforces Iowa’s onsite wastewater rules (IAC chapter 69), under which systems discharging to a tile, ditch, well or waterway are illegal.
• Wells. A $100 well permit is required before drilling a new well or unplugging an old one. A cost-share grant pays up to $700 to plug a well, up to $400 for a cistern and up to $2,000 for rehabilitation; wells 100 feet deep or less may be plugged by the owner under the environmentalist’s supervision, while deeper ones need a state-certified well contractor.
• Contractors. Contractors earning $2,000 or more a year from construction work register with the state; the county posts no local contractor registration.

How to apply for a Plymouth County permit

Review, corrections and what causes delay

The Zoning Administrator must issue a zoning compliance certificate, or a written denial with reasons, within 15 days of the filing; if neither comes, the applicant may appeal straight to the Board of Adjustment. Because the office is open only two days a week, allow for that when booking contractors. A permit lapses after 90 days if no substantial start has been made and after one year if the work is not finished, unless the administrator extends it in writing. Conditional uses and rezonings add public hearings.

Inspections in Plymouth County

The county does not inspect framing, plumbing or mechanical work; its permit form says so in writing. What it does check is zoning: staff may visit to confirm setbacks and progress, and the certificate of occupancy is issued within ten days after a new or altered building is completed in line with the ordinance, except for exempt farm buildings. Septic systems are the main county construction inspection: every system must be inspected by the Sanitarian before backfilling, and installers are asked to call 24 hours ahead.

Wiring is inspected by the state electrical inspector under the state permit. Driveway entrances are priced and installed under the County Engineer’s entrance policy, so arrange the entrance with that office before the house is staked. Rural well owners can have their water tested for free through the Sanitarian, and the county offers free arsenic test kits for private wells.

Iowa building code

Plymouth County enforces its zoning, subdivision and floodplain ordinances in the unincorporated area, and the ordinances it posts include no building code. FEMA’s Community Status Book lists Plymouth County as participating in the National Flood Insurance Program, with flood maps effective October 27, 2022.

Iowa lets most cities and counties adopt the state building code, another code or none (a city of more than 15,000 must enforce at least the state code), but the energy, accessibility, fire, plumbing, mechanical and electrical rules apply statewide. Iowa rules

Plymouth County permit search and official resources

There is no online permit search; land use permits and zoning files are kept by Planning & Zoning, septic records and system maps by the Sanitarian, and both can be asked for by email or phone. The supervisors’ minutes for 2026 are posted as one file on the county site.

• Plymouth County Planning & Zoning
• Land use (building) permit form
• Zoning fee schedule (March 3, 2026)
• Zoning ordinance (updated October 24, 2023)
• Subdivision ordinance
• County zoning map
• Sanitarian: wells and septic
• Septic permit application
• County Engineer
• Entrance policy (2020)
• Construction in county road right of way
• E-911 addressing
• 911 address request form
• Board of Supervisors minutes, 2026
• State electrical permits (DIAL)
• FEMA Community Status Book, Iowa

Plymouth County permit FAQs

Does Plymouth County inspect new houses?

No. The county issues a land use permit that checks zoning and setbacks, and states it takes no responsibility for inspecting construction; the Sanitarian inspects septic systems and the state inspects wiring.

How much is a county building permit for a house?

$150 under $100,000, $250 from $100,000 to $250,000, and $1 per $1,000 of cost above that, so $300 for a $300,000 house.

When is the zoning office open?

Tuesdays and Wednesdays, 8:00 am to 5:00 pm with a lunch break from noon to 1:00 pm, in the Courthouse Annex in Le Mars.

How far back from the road must a house be?

60 feet from a county road right of way and 75 feet from a state road right of way, per the county permit form.

What does a septic permit cost?

$100, valid for one year, from the County Sanitarian; the same fee applies to a well permit.

Who builds my driveway entrance?

The county does, at your cost, under the 2020 entrance policy: the culvert plus $500 on a gravel road, or plus $750 or $1,250 on paved roads depending on right-of-way width.

Can I build a data center or battery facility in rural Plymouth County?

Ask the zoning office first. The supervisors adopted a moratorium on data centers and industrial battery facilities effective June 16, 2026, and the minutes set no end date.

Simplify Plymouth County permitting with Alliance Permitting

Alliance Permitting is a permit documentation and submission company in Iowa. We prepare your paperwork, file it correctly and coordinate with the permitting authority through issuance. We are not a contractor and we do not perform licensed plan review or inspections; that work stays with your licensed team and the jurisdiction.

This guide is provided by Alliance Permitting for general information about Plymouth County permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.