Increased development trends like the replacement of small homes with larger homes, expansion of existing homes, and additions of outdoor features like patios, accessory buildings, and driveways have resulted in an increase of impervious surfaces in Residential (R) zoning districts. This result has gained attention due to the environmental impacts and the County’s ability to achieve stormwater management and tree canopy goals. Residential zoning districts cover approximately 70% of the County’s private land, and the development trends occurring in these areas will determine the County’s tree canopy and stormwater management outcomes.
The purpose of the Low Residential Study (LRS) is to evaluate and consider amendments to the ACZO to support better stormwater and tree canopy outcomes in low residential areas. Specifically, this study will analyze maximum allowable impervious surface limits for individual lots and consider whether to keep current lot coverage limits. Additionally, the study will consider whether to establish contiguous plantable area requirements, and whether to adjust existing placement (yard and setback) requirements.
See the LRS webpage.
Staff Contacts
Nick Rogers
Community Planning, Housing and Development (CPHD)
703-228-0035
Aileen Winquist
Department of Environmental Services (DES)
703-228-3610
Resources
Schedule
Initial public engagement for the LRS is anticipated to begin in September 2025, with study completion targeted for Fall 2026.