Dont take any notice of cable colours. Red and black can be from 2006, which was the last year it was menat to be used, but some people still had a stock of it, so there is no way of telling the age just by the core colours.
If it is brown and blue cores, it will be after 2004.
Quote:
“If you get a professional electrician to do it (as I would recommend) it can become a slippery slope because as soon as they touch something, they have a duty of care to bring it up to the current standards.”
No they don’t. Any NEW work must be to current Regulations.
The Earthing and Bonding should also be suitable for continued use. If you get some idiot in, and he sees a 4mm earth cable, he’ll say it should be 16mm now. It doesnt, in most situations. Many sparkies are too thick to do a few calculations to see if what is already installed will comply to current regulations. There are 2 ways of determing earth cable sizes, either via a Table in the guidebook which overly errs onto a bigger cable size, or by doing a square root/division/multiplication calculation after doing a simple test. Guess which one most sparkies use?
To answer the OPs question, it takes 15 mins to make an informed decision as to whether a rewire is required. This involves a few checks at accessories, and a few insultaion tests to test the cables integrity.
Basically:
If an old fuse box, with rubber cables, then a rewire is usually recommended.
If an old fuse box with PVC cable then you may get away with a new consumer unit (far safer than a fusebox).
If a new(ish) CU, and PVC cable, then you should be good for many years.