Materials on receipt: how much?

[lb00]

Hi everyone,

 

I’ve just agreed on a price and start date with our builder for upcoming work on my flat. The project includes replacing the flooring (I’ll be supplying the tiles I’ve already ordered) and skirting boards, renovating two bathrooms, doing some minor electrical work (mostly adding a few sockets and replacing spot lights with LEDs), and redecorating.

 

We’ve agreed that the following materials:

adhesive, paint, wood, plasterboard, plumbing fittings, grout, silicone, and screws

will be paid for by us as they are delivered.

 

How much should I be paying for these materials for the works above?

One question I have is about the plumbing fittings—I assumed these would be included since the quote specifies bathroom renovations with plumbing. Should I push back on this?

Thanks in advance!