Sounds high but depends on quality ov finish. Are they going to lift floor boards or more likely cut them to lift sections. Lot ov wuk to do if replacing all wires on a full rewire. Peeps under estimate just how long it takes. Down ere in the civilised world yer looking at 2k5 for a 3 bed semi wiv normal plastic sockets, ferra full rewire. Praps gerrin near 3k.
As part ov the rules down ere the council have to be advised ov wuk. Partial or full rewire and change ov dist board requires council notified. Same fer window, external door and heating boiler change. All has to be done by qualified person. Yer can't get away wiv yer squirrel doing it then gerra qualified spark in to sign oft. A lot do but its on the sparks back if there's trouble. Tis why a lot won't sign oft others wuk so there's an option ov paying the council to inspect. They send a known contracter in. And job protection ov the trade is why some won't touch. Some treat it like a 10 year inspection and say nowt about rewire. There's no way a spark will lift floors to check joints ain't bin drilled/cut to thin and cable terminated rightly propper like. They should know if they didded the wuk themselfs. They limit non qualified squirrels to chsnging sockets and switches only.
If the house is empty and no floor coverings then its a dream job as yer can access anywhere. No furnature int way. Can drop cables into plaster wiv no fear ov decorating cost problems. 4k would be high. 7k5 they seem yer bags ov free cash.