How Long Does a House Rewire Take? UK Timeline Guide

If you're staring down the barrel of a full rewire, the first question is always the same: how long will your house be turned upside down? How long does a house rewire take is one of the most searched electrical questions in the UK, and for good reason. It affects when you can move back in, how much time off work you'll need, and how many days you'll be living without a working kettle.

On average, a full rewire takes between 3 and 10 days, depending on the property. A one-bedroom flat with easy access might be done in three days. A large Victorian terrace with solid walls and no existing chasing could take two weeks or more. Size, age, and access all move that number significantly.

In this guide, we'll break down realistic timelines by property type, explain what actually happens during each stage of a rewire, and cover the factors that can stretch a straightforward job into a much longer one. If you're planning works in London or the South East, this will help you set expectations before an engineer even sets foot on site.

Why the length of a rewire matters

A rewire isn't just an electrical job, it's a disruption to daily life. Every wall gets chased, every floorboard lifted, and every socket pulled out before new ones go back in. Knowing the likely timeframe before work starts lets you plan around it rather than reacting to it. Landlords need to know when a property becomes lettable again. Homeowners need to know how many nights they'll spend without hot water or heating. Businesses need to know how long a shop floor or office will be unusable.

The knock-on cost of an unplanned delay

Money is often the real driver behind wanting an accurate timeline. If you've booked time off work, arranged temporary accommodation, or scheduled a plasterer to come in straight after the electricians finish, every extra day costs you. Rewires that overrun because of unexpected wiring, damp walls, or asbestos-era materials can push a five-day job into two weeks, and that gap has to be paid for somehow, whether that's hotel nights, storage costs, or lost rental income.

A rewire that overruns by even three days can cost more in lost rent or hotel bills than the extra labour itself.

Coordinating with other trades

Rewires rarely happen in isolation. Most full rewires sit inside a wider renovation, alongside plasterers, decorators, and sometimes a kitchen or bathroom fitter. If the electrical work slips, everyone booked after it slips too. Getting a realistic completion date from your electrician means you can:

• Book the plasterer for the right week, not a guess

• Avoid paying tradespeople for days they can't actually work

• Plan any planned outages around tenants or staff

• Time your move back in without paying for overlapping accommodation

Living through the disruption

During a rewire, most properties lose power in sections as engineers work room by room. Water heating, internet, and cooking facilities are often affected too, since sockets and switches get isolated while new cabling goes in. Knowing whether you're looking at three days or three weeks changes how you prepare, whether that means staying with family, renting a short-term flat, or simply accepting a few uncomfortable evenings with a kettle plugged into an extension lead.

How timeframe affects tenanted and commercial properties

For landlords, an accurate rewire estimate is often the difference between a smooth tenancy transition and a costly void period. Commercial clients face a similar problem: every day a shop, office, or unit is offline for electrical work is a day of lost trade or productivity. The table below shows how the stakes differ by property type.

Setting the right expectations from day one, backed by a proper site survey rather than a rough guess over the phone, is what separates a smooth rewire from a stressful one. In the next section, we'll look at exactly how engineers arrive at that estimate, and what you can do to help them get it right.

How to estimate how long your rewire will take

Getting a reliable rewire timeline starts with a proper site visit, not a phone quote. An experienced electrician will walk the property, check the age of the existing wiring, and look at how easy it is to get under floors and behind walls. That single visit tells them far more than any square footage figure on its own, because two houses of the same size can take wildly different amounts of time depending on construction and condition.

Property size and bedroom count

Size is the starting point for any estimate, and most quotes begin with a rough figure based on bedrooms. Use this table as a general guide, then expect your engineer to adjust it after seeing the property in person.

The bedroom count gives a starting estimate, but access and construction decide the final number.

Access and construction type

Access is usually the biggest swing factor. Suspended timber floors and stud walls let cables run quickly with minimal mess. Solid concrete floors and dense masonry walls mean more chasing, more dust, and more time on site. A Victorian or Edwardian property with lath and plaster ceilings will almost always take longer than a 1990s new-build of the same size, simply because there's nowhere easy to hide a cable.

Existing wiring and hidden problems

Older installations sometimes hide surprises once floorboards come up, things like undocumented junction boxes, old fabric-insulated cable, or asbestos-containing materials that need specialist handling. A good electrician will flag the likelihood of this during the survey rather than after work starts, which is one reason an accurate quote takes longer than a five-minute call.

Questions worth asking before you book

• How many circuits will be replaced, and are any rooms excluded?

• Will floors need lifting throughout, or just in specific areas?

• Is there a second fix date booked for sockets, switches, and the consumer unit?

• What happens if hidden asbestos or damp is found mid-job?

Asking these upfront turns a vague estimate into a realistic working plan.

What happens day by day during a rewire

Breaking a rewire into stages makes the timeline much easier to picture, and it explains why you lose power in some rooms before others. Most jobs follow the same broad sequence, whether it's a three-day flat or a twelve-day house, just stretched or compressed depending on size.

First fix: the messy stage

First fix is where most of the disruption happens. Engineers lift floorboards, chase walls, and run new cabling from the consumer unit to every room. Dust and noise peak during this phase, and you'll typically lose power to entire sections of the house as old circuits get disconnected. On a standard 3-bed semi, expect first fix to take up roughly half the total job, often 3 to 4 days out of a 6 to 8 day rewire.

Testing and inspection

Once cabling is in, before anything gets covered up or plastered over, a competent electrician will test continuity and insulation resistance on every new circuit. This is a short but critical stage, usually a day or less, and it's the point where any wiring mistakes get caught before walls close up around them.

Skipping proper testing between first and second fix is how small wiring faults turn into expensive repairs months later.

Plastering gap

Many rewires pause here while a plasterer patches chased walls and ceilings. This isn't downtime for the electrician, it's a scheduled gap, often 2 to 5 days depending on how much plastering is needed and how quickly it dries. Landlords and homeowners sometimes forget to book this in advance, which is the single most common cause of a rewire dragging on longer than quoted.

Second fix and commissioning

Second fix is where the house starts looking normal again. Sockets, switches, light fittings, and the new consumer unit go in, and each circuit gets tested individually. Finally, the electrician issues an Electrical Installation Certificate, confirming the work meets BS 7671 wiring regulations. Second fix on an average house takes 1 to 2 days, and power is fully restored by the end of it.

A typical week for a 3-bed semi

• Day 1-3: First fix, cabling, chasing, floors up

• Day 4: Testing and inspection

• Day 5-6: Plastering (or scheduled gap)

• Day 7: Second fix, sockets and switches fitted

• Day 8: Final testing, certification, power restored

Planning your rewire with confidence

A full rewire will always disrupt daily life for a stretch, but it doesn't have to be an unknown one. Property size, access, and construction set the baseline timeline, while hidden wiring issues and plastering gaps decide whether you land at the low or high end of it. Get a proper site survey, book plasterers around the electrical schedule, and ask the right questions before work starts, and you'll avoid the overruns that catch most people out.

Beyond the rough figures in this guide, your actual timeframe depends on details only a qualified engineer can see once they're on site. If you're weighing up a rewire in London or the South East and want a timeline you can actually plan around, get a quote from our team and we'll walk you through what your property specifically needs, and how long it will genuinely take.