Can I add an accessory dwelling unit?

In most Little Elm residential districts, no. The residential use table (Article V, Table A) permits "Dwelling, accessory" only in the SF-RE Single-Family Ranchette Estate District; the cell is blank, meaning prohibited, in SF-1 through SF-4, A-1, A-2, SF-X, TH, MH-1, D, and MF. The nonresidential use table (Article V, Table B) separately permits an accessory dwelling in the AG Agricultural District. Where allowed, an ADU requires a building permit, may not be sold separately from the primary residence, must share the main structure's utility meter, must meet the same setback, height, and architectural rules as a detached garage except for a 20-foot rear setback, and is capped at 50 percent of the primary residence's square footage or 1,200 square feet, whichever is smaller (Sec. 106.05.02.1(f)). Start by confirming the zoning district with Development Services (Town Hall, 2nd Floor, 100 W. Eldorado Pkwy., Little Elm, TX 75068). This pack covers the incorporated Town of Little Elm only; the ETJ and unincorporated Denton County have no municipal zoning.