Accessory Structures in Doña Ana County, NM (2026)
2 rules for unincorporated Doña Ana County, New Mexico.
Verified from official government sources
ADU Rules
The D1 Low Density Residential zone allows one accessory dwelling unit per lot, capped at 1,800 square feet, but only with an approved special use permit under UDC Table 5.8; the D3 High Density Residential zone does not allow accessory dwellings at all.
Doña Ana County Accessory Dwelling Unit Rules
Significant RestrictionsDoña Ana County UDC § 350-502, Table 5.8 (D1 Zone)
Table 5.8 Site Standards: D1 Zone. Low Density Residential Zone (D1 & D1L) ... 2. Other Lot Standards Accessory dwelling: 1 accessory dwelling limited to 1,800 square feet and permitted by special use permit
Shed & Carport Rules
Sheds and other accessory buildings in the D1 Low Density Residential zone are capped at 5,000 square feet or 10% of the lot, whichever is less, must sit at least 10 feet from any other building, and cannot be built before the principal house exists.
Doña Ana County Shed and Accessory Building Rules
Some RestrictionsDoña Ana County UDC § 350-502.B(10) & Table 5.8 (D1 Zone)
In any residential zoning district, an accessory building or accessory structure shall not be allowed except where a principal building is permitted and exists prior to the construction of the accessory building or accessory structure. If a shipping container is used as a structure, an accessory structure, or accessory building, or for any other purpose, a building permit is required. A princip...
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