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Costs for rewiring 2 bed flat?

10 replies

HeadFairy · 21/01/2026 17:17

Said flat has been derelict and open to the elements in places for over a decade, now water tight but the whole place needs rewiring, new fuse box, and all the wiring chased off (currently riddled with trunking). This is in South London. Anyone had anything similar done recently and able to give me ballpark figures?

OP posts:
Geneticsbunny · 22/01/2026 07:32

How big is the flat? If you are putting the wires into the walls you will need a party wall agreement with any neighbouring flats.

BillABongesq · 22/01/2026 09:39

Assume other stuff will need doing as well? Below might help. In London would assume nearer to top of the range of estimates (but maybe then a little less as this covers a 3-bed house and you are looking at a 2-bed falt)

https://www.checkatrade.com/blog/cost-guides/cost-renovating-house/

HeadFairy · 22/01/2026 21:25

Geneticsbunny · 22/01/2026 07:32

How big is the flat? If you are putting the wires into the walls you will need a party wall agreement with any neighbouring flats.

The flat is in a conversion from a large Victorian house and I own the whole building so I don’t think I’ll need one.

OP posts:
DavidPeckham · 22/01/2026 23:05

You don't need a party wall agreement - ignore. There are so many variables to a job like this - location, amount of new sockets to be added, are any going to need new channels chased, have you done any prep work such as taking up carpets if needed to minimise the electricians time, is there furniture etc that needs moving around and so on. I had a new consumer unit put in about 2 years ago and this involved also wiring a new circuit to the garden room I was building and adding a consumer unit there, and also a new 32Amp circuit for the oven we were buying. This was £2800 from memory in London. I had done a lot of the prep work such as drilling holes to walls, clearing the furniture etc and they were there 2 days. For a two bed flat, assuming no new circuits and major faff I would guess around the £5k mark for London, 3.5-4.5k outside. The huge but relates to the above however about the complexity and what is being done.

Geneticsbunny · 23/01/2026 08:29

We ended up needing a party wall agreement in a terraced house as we were channelling into party walls to put sockets and wall lights in. Maybe it was the wall lights which triggered the party wall thing? Either way, the walls were victorian and thin and we ended up having to pay for next doors wall to be replastered and decorated. Just a note of caution. Walls in older buildings aren't always as good as you might think. If you own all the flats then I guess it's irrelevant but maybe worth bearing in mind.

kirinm · 23/01/2026 11:44

DP is an electrician in S London. Depends what you want obviously but he says a rough estimate of £1000 a room.

HeadFairy · 23/01/2026 15:36

DavidPeckham · 22/01/2026 23:05

You don't need a party wall agreement - ignore. There are so many variables to a job like this - location, amount of new sockets to be added, are any going to need new channels chased, have you done any prep work such as taking up carpets if needed to minimise the electricians time, is there furniture etc that needs moving around and so on. I had a new consumer unit put in about 2 years ago and this involved also wiring a new circuit to the garden room I was building and adding a consumer unit there, and also a new 32Amp circuit for the oven we were buying. This was £2800 from memory in London. I had done a lot of the prep work such as drilling holes to walls, clearing the furniture etc and they were there 2 days. For a two bed flat, assuming no new circuits and major faff I would guess around the £5k mark for London, 3.5-4.5k outside. The huge but relates to the above however about the complexity and what is being done.

Thanks for this, the flat is empty and derelict so no furniture or carpets to worry about. Current wiring is all in trunking so the whole lot will be chased in properly once the wiring is replaced. Here’s the detail of what the electrician put in the quote:

pendant lights , spotlights sockets, switches , power to kitchen appliances,cookers, extractor fan in the bathroom , smoke and heat sensors .new rcbos metal fuseboard with surge protection device, , new power supply . gas and water earth bonding !
Some circuits cables will be installed in the basement by trunking to avoid the future damage.
All switches and sockets and all fittings will be recessed in the wall chased in the wall

he’ll issue me with an electrical safety certificate at the end as the property is going to be rental.

OP posts:
DavidPeckham · 23/01/2026 16:01

HeadFairy · 23/01/2026 15:36

Thanks for this, the flat is empty and derelict so no furniture or carpets to worry about. Current wiring is all in trunking so the whole lot will be chased in properly once the wiring is replaced. Here’s the detail of what the electrician put in the quote:

pendant lights , spotlights sockets, switches , power to kitchen appliances,cookers, extractor fan in the bathroom , smoke and heat sensors .new rcbos metal fuseboard with surge protection device, , new power supply . gas and water earth bonding !
Some circuits cables will be installed in the basement by trunking to avoid the future damage.
All switches and sockets and all fittings will be recessed in the wall chased in the wall

he’ll issue me with an electrical safety certificate at the end as the property is going to be rental.

The better option may be to run the cabling under the floorboards if easily accessible. Don’t necessarily need to chase it all into the walls. You can also run electrical wiring behind skirting boards so again, no need to chase. What did the quote come back as out of interest?

HeadFairy · 23/01/2026 18:22

DavidPeckham · 23/01/2026 16:01

The better option may be to run the cabling under the floorboards if easily accessible. Don’t necessarily need to chase it all into the walls. You can also run electrical wiring behind skirting boards so again, no need to chase. What did the quote come back as out of interest?

the chasing out is the cables running up from the floor. Most of it is under floor boards, he will rewire and properly trunk it so it’s protected from any rodent type activity, but it’s a matter of running it up from floors to light fittings and plugs. There’s trunking all over the walls so he’s going to get rid of that.

The quote for all of above listed in my previous post is £6530 inclusive of vat.

OP posts:
DavidPeckham · 24/01/2026 00:32

HeadFairy · 23/01/2026 18:22

the chasing out is the cables running up from the floor. Most of it is under floor boards, he will rewire and properly trunk it so it’s protected from any rodent type activity, but it’s a matter of running it up from floors to light fittings and plugs. There’s trunking all over the walls so he’s going to get rid of that.

The quote for all of above listed in my previous post is £6530 inclusive of vat.

Ah ok that makes sense and not a million miles from what I thought. It’s a right faff but if the flat is empty will make things much easier.

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