I own a local plumbing business and we offer our customers several different services. I already have 1 website that ranks well and for the majority of my keywords im in the top3 results. However, I want to dominate the local serps and push out the competition. My main site has separate pages for each service. But as each individual service (e.g. boiler repairs) could be a whole separate business by itself, I want to create additional websites that focus solely on just 1 service. I then want to rank the new websites to take up more positions in the serps. What will I need to wary of to avoid having my main site penalised by Google?? It already ranks well in the serps and I have spent a lot of time and money in building it. I am ok with using black hat methods to get the new sites ranked but I don?t want to risk having my main site deindexed by Google. Any tips/advice would be greatly appreciated. Thanks!