New sewer, rainwater and drainage plan for building regs

Description

We need a sewer,rainwater and drainage plan with rainwater collection tanks for an existing historical building in the UK. End manhole depth is know and we have sketches for all the proposed locations for pipes and also have existing pipe survey.You will need to be either ARB/RIBA or CIAT registered and hold appropriate insurance.We have multiple drawings, the attached is only for context.Please propose your budget, the one indicated is irrelevant.