what do you think about
"thank you for the consideration but i'm not interested in the project"
if they ask why
"the condition of the property concerns me, and the access to do the work is going to increase the price drastically and i don't think you will be happy with the end price, which means i won't be satisfied with my work, i would only consider that type of work for long-time existing customers."
or
" i get the feeling we might not get along"
or
" i only take problem work like this for long-time existing customers"
or
"i think to do this right would cost more than most people would want to pay and i like for my customers to feel like they got a deal and i wouldn't be able to do that on this job."
"i don't think i am the right contractor for you"
all circumstance dependent obviously
