Wednesday, September 18, 2019
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What is a Subdivision?

A subdivision is the creation or division of a lot, tract, parcel or other unit of land for the immediate or future purpose of sale, building development or redevelopment, for residential, recreational, industrial, commercial or public uses. The process for subdividing depends on the number of lots being created, the size of the lots being created and the type of subdivision. We encourage landowners to become familiar with the Subdivision Regulations prior to submitting an application for a subdivision.

The Big Horn County Subdivision Regulations were modeled directly from the Wyoming State Statutes, Title 18, Chapter 5, Article 3 and customized to meet the specific needs of our county. They were last amended in April of 2012. We anticipate significant revisions in the coming year to provide better clarification of the legal language, process maps to guide landowners through the subdivision process and affidavits for exemptions.

Types of Subdivisions

Exempt Subdivision: A land division that is not required to go through the formal subdivision process with oversight by the Land Planning Department. The most common exemptions seen in Big Horn County are >35-acre parcel splits, boundary line adjustments, family exemptions and mortgages.

Click on the image below to see a graphic that shows some examples of exempt subdivisions:

ExemptSubdiv Example Graphic

Note: Not all exemptions are cut and dry; special conditions apply in most cases.  All exemptions and conditions for exemptions are explained in Chapter III, Section 3 of the Big Horn County Subdivision Regulations.

Simple Subdivision: A division of one unit of land into one or two lots, each smaller than 35 acres. Parcels greater than or equal to 35 acres that are created as part of land division are exempt from the subdivision process.



Major Subdivision: A division of one unit of land into three or more lots, each smaller than 35 acres. A major subdivision includes any subdivision that does not qualify as a simple subdivision.



Click on the image below to see a graphic that shows various types of subdivisions by lot number/size:

TypesOfSubdivisions LotNumberSizeOnly

Process Checklists

We have developed a few checklists to help our customers visualize and keep track of all the moving pieces throughout the process.

Basic Simple Subdivision Process Checklist

Detailed Simple Subdivision Process Checklist

- To start the process on a new simple subdivision, complete and submit a Simple Subdivision Application to the Land Planning Department. 
- To modify any part of an existing subdivision, complete and submit a Subdivision Amendment Application to the Land Planning Department.
- To start the process on a new major subdivision, please consult with the Land Planner directly.

Contact Land Planning

Land Planning Office

P.O. Box 29
417 Murphy Street
Basin, WY 82410

Phone: 307-568-2424
Fax: 307-568-2461

Office Hours
Monday - Friday
8:00am – 5:00pm*
Due to fieldwork and meetings,
appointments are strongly recommended.