Utility room and W/C plumbing

I'm about to order the bits needed for our Utility and W/C plumbing. Does my plan sound right to you?

Water Supply;

- Existing 22mm HEP (hot and cold) running in ceiling for bath in bathroom above.

- 15mm tee into for washing machine

- 15mm tee into for toilet

- 10mm tee into for basin

I've heard that the washing machine and toilet should be plumbed in before the multibloc valve, is that correct? Doing so would be more of a faff (or not as easy as just teeing into HEP)

Waste;

- new 110mm stack for toilet

- 40mm Y-shaped drain for washing machine + tumble dryer drain, with trap, feeding into new 110mm stack

- 32mm condensate pipe from MVHR feeding into washing machine 40mm, before the existing trap, that goes into 110mm stack

- 32mm drain for W/C basin, with trap, feeding into new 110mm stack

Edited February 27, 20233 yr by jayc89