Last three bed with loft floor terrace was £4900.
That was 10 circuits, rcbo board 50 sockets, 9 rooms (three with led spots), three halls, front and rear external lights, smokes, BT, data and TV.
All flat plates or mk switches and sockets.
Just quoted a flat with loft and that's over £3000.
There's two types of rewire, basic and cover all. My work is always cover all and clients see things as value add.
For a simple 3 bed terrace I expect to be asked for
Kitchen
Ring, oven, boiler circuits
Spot lamps, counter lighting, vents (cooker and main)
Lounge 6-8 doubles, one light
2nd lounge- same as above
Hallway 1 socket, two way lighting or three way if external light
External light
Upper hall 1 socket, 2 way lighting
Bedrooms 4 sockets each, 2 way lighting (bed area and door area)
Bathrooms vent, spots, shaver and mirror, maybe shower or pump.
Misc- ch stat, control wiring, loft light and socket, garage, rear external
Smoke detection
TV cable and terrestrial
Phone
Data to each room (smart tv)
Hopefully you get the idea that there can be a wide variance on the job spec.
Don't forget fittings, some more decorative flat plates will be 225% of cheap white plastic.
But, you need to gauge your requirements, jot a spec and get quotes based on a fixed need. Then the quotes will be like for like on content.