What actually happens during a full rewire?

"Full rewire" is one of those phrases that makes homeowners wince. It sounds enormous, expensive and disruptive... floorboards up, walls chased, dust everywhere. Some of that reputation is fair, and some of it isn't. If you're wondering whether your home needs one, or you've been told it does and you want to know what you're signing up for, here's an honest, step-by-step account of what a rewire actually involves.

First: do you even need one?

Not every old house needs a full rewire, and we'd never want you to spend that kind of money on a hunch. A rewire replaces all the fixed wiring in a property, so it's a big job... reserved for homes where the wiring has genuinely reached the end of its life, not just homes that are old.

The usual prompts are things like: original wiring in a property built before the 1970s, cabling with old rubber, fabric or lead sheathing, a fuse box that predates modern consumer units, very few sockets so you're living on extension leads, or recurring faults that keep cropping up across different circuits. If several of those apply, a rewire may well be the sensible answer.

The way to be sure, rather than guess, is to have the installation inspected first. An EICR (Electrical Installation Condition Report) tells you the true condition of the wiring throughout the house. Sometimes it confirms a rewire is overdue; sometimes it shows that targeted repairs and a new consumer unit will do the job for a fraction of the cost. Either way, you're deciding on evidence.

The honest truth about disruption

Let's deal with the elephant in the room. A rewire is disruptive... there's no point pretending otherwise. To replace the cables hidden in your walls, floors and ceilings, we need to get to them, which means lifting floorboards, running cables through voids, and cutting channels (called "chases") into walls where sockets and switches sit.

But there's a lot we do to keep it manageable. We work methodically, room by room, so the whole house isn't torn up at once. We keep dust down as much as we can, and we plan the routes carefully to minimise the damage to your plaster and floors. It's still a job that generates mess... but it's controlled mess, done in a sensible order, not chaos. Most people find it far more bearable than they feared.

Whether you can stay in the house during the work depends on the property and how much is being done at once. On many jobs you can, with some rooms out of action at a time; on others, particularly if it's empty between tenancies or during a wider renovation, it's easier all round to have the place clear. We'll talk that through with you before we start.

Step by step: what we actually do

A full rewire runs in clear phases, and it helps to know the shape of it:

1. First fix. This is the big, messy stage. We run all the new cables through the walls, ceilings and under the floorboards... the hidden skeleton of the whole system. We plan where every socket, switch and light will go (a good moment to add the extra sockets you've always wanted), and we do the cutting and channelling now, while everything's open.

2. The new consumer unit. With the new cabling in place, we install a modern consumer unit with proper RCD and MCB protection... the brain of the new system. If you'd like to understand that part of the job in its own right, our fuse box replacement guide goes into more detail on what a modern board gives you.

3. Second fix. Once any plastering and making-good is done, we come back to fit all the visible parts... the sockets, switches, light fittings and face plates. This is the stage where the house starts to look finished again rather than a building site.

4. Testing and certification. Finally, and importantly, we test the whole installation thoroughly, circuit by circuit, to confirm everything is safe and working as it should. You then receive full certification, including an Electrical Installation Certificate. Because we're NAPIT registered and the work is notifiable under Part P of the Building Regulations, we certify it and notify Building Control on your behalf... you don't need to arrange anything with the council yourself.

How long does it take?

There's no single answer, because it depends on the size of the property and how much is being done... but a full rewire is generally a job of several days, not hours, phased across the stages above. A small flat is naturally quicker than a large family house. When we quote, we'll give you a realistic timeline for your specific home, so you can plan around it rather than being left guessing.

What you're left with at the end

When it's done, your home has a completely modern electrical system: safe, compliant with the current BS 7671 Wiring Regulations, and ready for how households actually use electricity now... plenty of sockets, proper protection on every circuit, and no more nagging worry about what's hidden in the walls. It's also a genuine selling point when the time comes, and full certification to show for it.

A rewire is a proper investment, both in money and in a few days of upheaval. But for a home that genuinely needs one, it's one of the most valuable things you can do... and it's the last time you'll have to think about your wiring for decades.

Thinking about it?

If you suspect your home might need rewiring, or you've had it flagged on a survey and want a second opinion, the sensible first step is a proper look at what you've got. You can read more about our full rewire service, or call us on +44 7722 132736 for a free, no-obligation assessment. We're a family-run electrical business based in Slough, covering Windsor, Maidenhead, Reading and the surrounding area... and we'll always tell you honestly whether a full rewire is really what your home needs.