I will always start with 7 rolls of cable, 1 of each Red, Yellow and Blue, 2 each Black, 2 each Green. This allows me to pull 2 sets (live, neutral and earth) at one time, to 2 rooms for example.
Also the same 7 rolls for 2.5 mm², but the 4 mm² is fine at 3 rolls. Ultimately I think you will be using at least double of this wires (14 rolls, each size) for your entire house.

In my opinion, the ethernet cable is too much at 3 rolls. Assuming each branch is 100 ft (for 22 x 75 house) one roll is 1000 ft, so one roll can wire up 10 points. Roughly measure where all the points will be, and then you can estimate how much you need.

Please don't misunderstand. 305 m/1000 ft/1 box can easily wire up more than 10 points, not up to 10 points. Depends on the distance of the point from the router/switch. Measure your floor plan, and estimate your distance, to estimate the quantity you need. My 100 ft per point was an example only.
I can't comment on the contractor themselves, but try to do the following:
1. Don't share neutrals - One line out must have one neutral returning to the DB.
2. Group the wiring areas logically - for eg 1 set 1.5 mm² for lights and fan, 2 sets 2.5 mm² for power, grouped as 1 room.
3. Label the wires - Just use simple cable markers for both the live and neutral.
4. Group the MCBs logically in the DB - Don't let the wireman randomly connect the wires to the MCBs, arrange it logically.

5. Get an "as wired" drawing - Can be simple one, just so you know what goes where (just try to remember in 10 years time without this!)

6. If you think you need 1 socket in the area, install 2. If you think you need 2, install 3. You can never have enough power sockets.

Actually, if you can use something like SketchUp, you can plan everything from where things need to be, to wire length needed, to location of sockets and lights, to where to hack the walls, etc. But I don't really expect people to want to do this, even thought it will save cost and aggravation during the renovation.


Do some planning, think things through, and you should be okay. PM if you need any advice, and I'll try to help. Good luck!