I would strongly suggest that you include the Civil Contractors / Landscapists etc.

I am still looking for reliable Contractors and Landscapists. It would be good to have common skilled tradesmen like, Electricians, Plumbers, Carpenters etc who can be rated by the users. You may chose to place only the people who get good reviews on the site, so more and more people can contact them.

You may even want to include Government Officials who are very helpful from whom the people can benefit...at least those who have any work in those departments.