2 county-level rules, plus city-specific rules for 4 cities in Collin County, Texas.
Verified from official government sources
Solar panel installs in Collin County require an electrical/building permit ($200-400) and interconnection agreement with Oncor or CoServ. TX Property Code §202.010 limits HOA restrictions on solar devices.
Tex. Property Code Sec. 202.010 (Regulation of Solar Energy Devices)
Sec. 202.010. REGULATION OF SOLAR ENERGY DEVICES. (a) In this section:(1) "Development period" means a period stated in a declaration during which a declarant reserves:(A) a right to facilitate the development, construction, and marketing of the subdivision; and(B) a right to direct the size, shape, and composition of the subdivision.(1-a) "Residential unit" means a structure or part of ...
TX Property Code §202.010 broadly prohibits HOAs from banning solar panels. HOAs may only impose restrictions that do not substantially increase cost (>10%) or decrease efficiency (>10%).
4 cities in Collin County have their own solar energy rules. Each link goes to that city's dedicated page with code citations.
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