Design and build Toilet Block

We are looking for a company to design and build a toilet block for our warehouse in Macclesfield, as what we have at the moment is not ideal and we require more toilets. We are open to ideas, either working with our current footprint or building a whole new toilet block. I have attached what we currently have in place and something that we had drawn up without building, but we could really do with someone in this area of expertise to visit our warehouse and provide costs for both options.