Bidding website contract work

Looking to start a website catering to Renovators and Contractors alike. Much like [login to view URL], Renovators have the opportunity to post their projects online with contractors, suppliers, etc having the capability to bid on projects. Unlike [login to view URL] each bid by a specified contractor is charged (Please refer to the website [login to view URL] for a detailed comparison on how we envision the website to look like). A bidding software will be needed for successful bidders allowing contractors to view specific details of the project and bid with others in an interactive viewing space. Again, please refer to [login to view URL] for a visiual comparison. We will be located out of Canada targetting the Canadian market.