For a site in a town with a population of 10,000 to qualify under Location and Transportation Credit, Site Selection, Option 2: Infill Development, what portion of the site’s perimeter must border previously disturbed land?

According to the LEED v4.1 for Homes and Multifamily rating system, to qualify for LT Credit: Site Selection under Option 2, the project must be located on an infill site. An infill site is explicitly defined as a site where at least 75% of the site perimeter borders land that has been previously developed. This calculation excludes any portion of the perimeter that borders a public right-of-way. The intent is to direct development to areas with existing infrastructure and reduce the environmental impacts of sprawl. The population of the town is not a variable in this specific requirement.

A. 25%: This value is significantly below the minimum threshold required by LEED to be considered an infill site.
B. 50%: This percentage is insufficient; it does not meet the 75% minimum requirement for an infill site designation.
D. 100%: While a site with 100% of its perimeter bordering previously developed land would qualify, it is not the minimum requirement.

1. U.S. Green Building Council. (2020). LEED v4.1 Homes and Multifamily Rating System. Washington, DC: USGBC. Page 13, LT Credit: Site Selection, Option 2. Infill Site.

2. U.S. Green Building Council. (2020). LEED v4.1 Building Design and Construction Reference Guide. Washington, DC: USGBC. "Getting Started" section, "LEED Glossary," definition of "Infill site." The definition states, "a site where at least 75% of the land area, exclusive of rights-of-way, within ½ mile (800 meters) of the project boundary is previously developed." The perimeter rule is a specific application for the credit. The core concept of 75% is consistent.