Hi, I wish to start a service but I'm looking into the possible repercussions on SERP, You see I'm going to have different subdomains in this fashion: plumberdandenong.domain.com plumbernoblepark.domain.com plumberbendigo.domain.com And etc. And if a business decided to get multiple domains which means their business details would be the same across different subdomains and the only thing that would differ is the subdomain references within that how would this reflect on my websites SEO. Thanks a lot for any and all advice concerning this issue.
google treats a subdomain as a completely different site, just make sure its not identical (copyscape free)
In some cases a business may want more than one suburb so the only difference in subdomains will be the location references but other than the everything else will be the same.
If they are not identical, then its not a problem but you can just edit few things from each to avoid penalization.
Yes, Google always take sub domain as different domain. So dont use same content in sub domains. Otherwise your site will be penalized.