Catawba County, NC Building Setbacks & Zoning: Lot Coverage Limits (2026)

The watershed protection overlay district (WP-O) applies wherever the county's official zoning map shows a WS-II, WS-III or WS-IV watershed classification, and its built-upon area limits replace the county's standard lot-coverage rules inside those boundaries. Under § 44-434.04, single-family lots in a WS-II critical area must be at least 80,000 square feet, and all other residential or nonresidential development is capped at 6 percent built-upon area. In the WS-II balance of watershed (§ 44-434.05) the cap rises to 12 percent, with a 40,000-square-foot single-family minimum lot.

WS-III critical areas (§ 44-434.06) also cap built-upon area at 12 percent on 40,000-square-foot lots, while the WS-III balance of watershed (§ 44-434.07) allows single-family lots as small as 20,000 square feet and a 24 percent built-upon cap for everything else. In WS-IV protected areas (§ 44-434.09), the cap is 24 percent where curb and gutter streets are installed, or 36 percent where they are not. In WS-II and WS-III balance-of-watershed zones, nonresidential projects can exceed those caps on up to ten percent of the balance-of-watershed acreage by obtaining a 10/70 bonus permit under § 44-434.10, reviewed by the board of adjustment as a special use permit; the permit is valid for two years and, once expired, cannot be reapplied for on that site for 12 months.

Developments using the high-density option in WS-IV areas can build to 50 or 70 percent built-upon area if they install engineered stormwater controls capturing the first inch of rainfall, per § 44-434.15. Qualifying development also needs a minimum 30-foot vegetative buffer along perennial streams (100 feet for high-density or 10/70 projects) under § 44-434.12, and site plans submitted to the planning director must show the exact square footage and percentage of built-upon area proposed.