Le Mars, IA Zoning, Building Permits & Septic Rules

The City of Le Mars, Iowa, in Plymouth County, administers its own Chapter 167 zoning ordinance¹, and a permit is required before you excavate for or erect a building inside city limits, except farm buildings². The city's building official also serves as zoning administrator³. We could not confirm who issues septic permits inside the city, so ask the city and the Plymouth County Sanitarian.

At a glance

Zoning: Le Mars administers its own zoning ordinance (Chapter 167) inside city limits¹
Building permit: Required before excavating for or building a building, except farm buildings²
Who issues it: The City of Le Mars building department at City Hall³
Certificate of occupancy: Required before a new building is occupied⁴
Typical in-town lot (R-1): 60 ft wide and 7,500 sq ft minimum for a single-family lot⁵
Height limit: 35 feet in the R and R-1 districts⁶⁷
Septic: Not confirmed inside city limits; county permits cost $100 where the Plymouth County Sanitarian issues them⁸
Accessory dwelling: Iowa cities must allow at least one where a single-family home is allowed⁹

Who to call

Building permits

City of Le Mars Code & Building (building official / zoning administrator)

Building permits, plan review and inspections, and zoning administration inside Le Mars city limits

712-546-7018

40 Central Avenue SE, Le Mars, IA 51031

Septic permits

Plymouth County Sanitarian / Environmental Health

Well and septic permits for Plymouth County; contact to confirm how this applies to a lot inside Le Mars

712-546-1259

[email protected]

215 4th Ave S.E., Le Mars, Iowa 51028

Contact details are copied from each office’s official page and were checked against it on October 24, 2026.

Off-grid gear

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

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Does Le Mars, Iowa have zoning, and what does it mean for lot size and setbacks?

Yes. Le Mars administers its own zoning ordinance, Chapter 167 of the city code, inside city limits, in place of any county zoning there¹. The published districts include R (rural), RC (conservation) and R-1 (residential)¹⁰. Rules differ by district, so find your parcel's district on the city's zoning map before you plan anything.

R-1 residential: a single-family lot needs at least 60 feet of width and 7,500 square feet⁵. Principal buildings need a 25-foot front yard, a 30-foot rear yard, and side yards of 8 feet for one story or 10 feet for more than one story¹¹.

R rural: a single-family lot needs at least 150 feet of width and 43,560 square feet¹², with yards of 50 feet in front, 20 feet at the sides and 50 feet in back¹³. Dwellings are prohibited in the RC district¹².

Buildings in the R and R-1 districts top out at 35 feet, with exceptions for listed public, institutional, agricultural and church buildings⁶.

Do you need a building permit in Le Mars, and who issues it?

Yes, in most cases. Inside Le Mars city limits, no permit to excavate for or erect or alter any building is issued, other than for farm buildings, until an application for a certificate of occupancy and compliance has been approved². The application shows the applicant's name, a survey of the lot, and the size, shape and location of the building¹⁴.

The City of Le Mars building department handles this: it reviews plans and inspects construction against the adopted building codes, and the building official also acts as zoning administrator³. The city's Code & Building page lists a building permit application packet and an online building permit application³. A new building cannot be occupied until the building official issues a certificate of occupancy⁴. We could not confirm the city's building-permit fees or inspection schedule, so ask the department when you call.

How do septic permits work in Le Mars?

We could not confirm whether a lot inside Le Mars city limits can use a private septic system, or who permits it. The city code has a chapter on on-site wastewater systems, and it also covers sanitary sewer connections, but those rules were not confirmed for this guide. Ask the city building department first, since a lot with city sewer available may not be allowed a private system³.

For private septic and wells in Plymouth County generally, the county Sanitarian is the permitting office¹⁵. A septic permit must be obtained and paid for before installation and costs $100⁸. The Sanitarian is also the office to confirm how that applies to a lot inside the city¹⁶.

Can you live in an RV or tiny home in Le Mars?

We could not confirm any rule on long-term RV living, temporary camping or tiny homes as dwellings inside Le Mars city limits. The zoning ordinance lists a travel trailer camp as a conditional use in the RC district, which is not a rule for living in an RV on your own lot¹⁰. Call the building official, who is also the zoning administrator, before you park or place anything you plan to live in³.

One statewide rule helps with a small second dwelling: where a single-family home is allowed, an Iowa city must allow at least one accessory dwelling unit on the same lot⁹. The city's own size and placement standards for those units were not confirmed.

Building a home in Le Mars: the steps, in order

Find the parcel's zoning district on the city's zoning map and check lot size, setbacks and height for that district¹⁰.
Get a survey of the lot, since the permit application needs the lot's dimensions as shown by a survey¹⁴.
Apply to the City of Le Mars building department for the building permit and certificate of occupancy and compliance³.
Ask the city and the Plymouth County Sanitarian how sewer, septic and a well apply to the lot¹⁶.
Build with plan review and on-site inspections by the building department³.
Get the certificate of occupancy before anyone moves in⁴.
If you divide land, plan for a recorded plat under city code Chapter 165¹⁷.

What stays with Plymouth County, and what should you check before you buy?

The county's zoning ordinance applies only to unincorporated Plymouth County, not to land inside Le Mars¹⁸. If your parcel is outside city limits, use the Plymouth County page instead, because different offices and rules apply there. Septic and well permits run through the county Sanitarian¹⁵, and new wells need a $100 permit¹⁹.

Before you buy, confirm the parcel is inside city limits, its zoning district, and whether city sewer and water reach it. Plymouth County's effective property tax rate is 1.1%²⁰, and its median property tax bill is $2,363 per year²¹.

Watch-outs

Le Mars's building-code chapter, fees, owner-builder rules and septic rules inside city limits could not be confirmed, so call the building department at 712-546-7018 before you commit to a plan³.
The Plymouth County Planning & Zoning Department serves unincorporated land only; a lot inside Le Mars goes through the city instead¹⁸.
Iowa's owner-builder exemption covers contractor registration only, so it does not by itself waive the city's building permit²².

Sources

Written October 24, 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 Le Mars publishes no rule on the point, not that none exists. Plymouth County’s page lists the county offices to call.

Zoning, building permits and septic rules in Le Mars, Iowa