First fix and second fix, explained
On a rewire or new build, "first fix" is running cables through walls and floors before they're closed up; "second fix" is fitting sockets, switches and light fittings once decorating is done. Getting the timing right with other trades on site avoids cables being covered before they're tested.
What affects the cost
Cost depends on the scope of the job, how much of the property needs to be accessed, the age and condition of the existing wiring, and whether the consumer unit needs upgrading. A single socket replacement is quick and low-cost; a full rewire in an older property takes longer, partly because of the making-good work afterwards.
When does a consumer unit need replacing?
Older fuse boxes with rewireable fuses or plastic (rather than metal) casings don't meet current wiring regulations and are a common reason a rewire quote comes in higher than expected. A modern consumer unit uses RCBOs, which cut power to a single faulty circuit rather than the whole property.
Background checks and identity verification
Before comparing quotes, it's worth checking an electrician's identity and trading history, not just their qualifications — a registration number, a landline or verifiable business address, and reviews that reference specific jobs are all better signals than a mobile number alone.
Common electrical myths, busted
"If it's not broken, the wiring's fine" — wiring can be dangerous long before it visibly fails. "Any handyman can do electrics if it's small" — scope, not size, determines whether work is notifiable. "A tripped RCD means the RCD is faulty" — usually it means something else on that circuit is, and the RCD is working as intended.
How electrician quotes work
Describe the job, including property type, access, and whether the work is notifiable if you know. Electricians use this to give an initial estimate, then confirm the final price after seeing the job in person — particularly for anything involving old wiring, where the scope can change once cables are exposed.
Signs your property needs rewiring
Round-pin sockets, fabric or rubber-insulated cabling, a fuse box with a wooden back, or lights that dim when an appliance switches on are all signs the wiring is overdue for replacement. Most UK wiring is rated to last 30 to 40 years before it needs a full rewire.
What a good electrical quote should include
A proper quote should state the scope of work, whether it's notifiable under Part P, an itemised breakdown of labour vs materials, the certificate you'll receive on completion, and how long the job is expected to take. If a quote is missing any of these, ask before agreeing to the work.