A June report [7] by the DEA's Denver division warns of potential dangers and annoyances posed by large-scale marijuana growing operations hidden in residential neighborhoods. These operations can be a nuisance to neighbors, prompting complaints about "strong odors, excessive noise from industrial air-conditioning units, blown electrical transformers, and heavy vehicle traffic," according to the DEA.
Beyond that, a big indoor marijuana operation requires lots of high-powered lighting, water, and ventilation. People making these modifications in a haphazard or amateurish way risk doing serious damage to their homes.
Links
[1] http://www.msn.com/en-us/money/realestate/the-dea-warns-marijuana-grow-spots-are-the-new-meth-houses/ar-BBvfFLB?li=BBnbfcN&ocid=iehp
[2] http://www.rethinkpot.org/tags/dea
[3] http://www.rethinkpot.org/tags/electricity
[4] http://www.rethinkpot.org/tags/water
[5] http://www.rethinkpot.org/tags/neighborhood
[6] http://www.rethinkpot.org/tags/grow-sites
[7] https://www.dea.gov/divisions/den/2016/den062216.pdf