Starting in 2009, the Colorado Legislature began adding requirements that builders offer certain options to accommodate high-efficiency devices. These requirements started with solar prewire options in 2009, then water-smart home options in 2010. In 2020, the Legislature added requirements for electric vehicle charging and heating systems. These sections apply to unoccupied homes serving as sales inventory or a model home or manufactured homes, as defined by Colorado law. While the Legislature has only required builders to include options to accommodate these devices, it may be just a matter of time until builders must install the prescribed devices themselves.

In 2009, the Legislature passed C.R.S. 38-35.7-106, which was amended this year by HB 20-1155. As it now reads, Colorado law requires every builder of single-family detached residences to offer to have the home’s electrical or plumbing system, or both, include:

1. A residential photovoltaic solar generation system or a residential thermal system, or both;
2. Upgrades of wiring or plumbing, or both, planned by the builder to accommodate future installation of such systems; and
3. A chase or conduit, or both, constructed to allow ease of future installation of the necessary wiring or plumbing for such systems.