According to Pilgrim Media Group, the production company behind Renovation Impossible, all you have to do to be considered for the show is email [email protected] with details to help them determine if your case fits the bill for future episodes.
The website asks that you include “recent photos of you [and your partner], photos of the house, your phone number, and a brief explanation of why you need help from our renovation team.” Alternatively, you can fill out the form on the website.
Source: https://www.distractify.com/p/how-to-get-on-renovation-impossible