Appreciate some cost guidance from sifu's here

I'm about to move into my new place which is an old 2.5 storey 20x80 house is SS12 Subang

I'm planning to:
1) front extension by 20x8 feet for both floors
2) back extension by 20x7 feet for remaining space for both floors
3) replacement of tiles at car porch and extension area
4) re doing 3 toilets in the house which will be extended as part of extension above with no moving WC and other piping works which will increase cost (happy to work around)
5) rewiring and to install necessary airconds in all rooms in the house
6) piping work where required including adding water tank / water pump for the house
7) whole house painting
8) removing existing 10 feet gate and putting in 16 feet gate. Hacking work here

For the above works under a budget, what's the cost I be expecting for wet works

I don't mind buying the tiles, paint, fittings etc. What's the rough estimation?

Appreciate some guidance