We have received your bid for performing (Service to be performed) at our (Place where service is to be done) location. After evaluating all of the bids submitted, we have decided to accept your proposal.
I have attached a signed copy of the submitted contract. As we stated in our bid requirements, we desire your company services to start as of the first of next week.
Please have a company representative contact me. I will be happy to arrange a meeting to finalize details including how work is to be exactly done.
I look forward to a long and successful relationship with your company.