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Builders costs, what seems reasonable!

7 replies

TheBeaTgoeson1 · 30/09/2025 07:24

I am so clueless about building costs and wondered if you could help with any experience of costs over the last year or so!

House in the midlands, average area of the suburbs, 4 bed house. Semi detached. Not sure if that it’s important context.

we are adding a small extension to the non-attached side of the house. It will house our downstairs toilet and sink, as well as some general storage space. Around 3 m long, and about 1.2 m wide. So not a huge space at all, just a little bit of extra space, and the main intention being the downstairs loo, the plans are lovely, and I think it will work well for us.

Separately, We are also putting in a new kitchen, it’s a fairly large space.

it’s really the extension part which I have no idea what reasonable costs are kitchens are a little bit more easy to navigate, we will also do a little bit more to do with plumbing, and general decoration, but again I find those costs a bit less Cloak and Dagger. it would be great to know what might be your experiences for the little extension part. Or extensions in general!

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TwoLeftSocksWithHoles · 30/09/2025 07:37

This is from Yahoo (Another AI generated answer 😟)

RICS (Royal Institution of Chartered Surveyors) doesn't directly set extension costs, but its members use their per-square-meter cost rates as a benchmark for estimating build costs. Extension costs vary significantly by location, size, complexity, and quality, with per-square-meter rates for typical single-storey projects ranging from roughly £1,500 to over £2,500. For example, a high-quality double-storey extension might cost £1,800 to £3,000 per square meter.

With toilets, it may be more expensive depending where your current drains / sewers are.

TheBeaTgoeson1 · 30/09/2025 07:41

Hello, yes, I had a look at the rough idea of what the cost might be, I’m I know, it would be great if it was a simple! I guess I’m probably looking for that longshot that somebody might have more direct experience of this particular size of extension!

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Wexone · 30/09/2025 12:14

you need to reach out and get three quotes. you won't get exact prices as the variables are too much. we don't know the area the spec you want etc. you alos need to physically see the structure to see what you are dealing with. reach out to local builders for three quotes and you will see cost. or reach out to a quaintly surveyor to get a bill of materials. please note that builders are hard to come by these days so will take some time

TinyFlamingo · 02/10/2025 05:00

London based my outside loo/ portch of a similar size at front of house all in is 9k.

That's including building, labour, plumbing, drainage cost per square footage, and figures, and fittings. Won't be painted but would be partially tiled.

Obviously prices vary wildly across UK but that's very reasonable for here.

Get 3 quotes and compare, don't go with first one unless a recommendation for a lot of people and the builders building with roice of area in mind as this makes a massive difference too

TinyFlamingo · 02/10/2025 05:03

Kitchens are trickier depends on size. My friends small kitchen and very cheap choices is 5k without fitting cost. Mine was just quoted at 20k including fitting as it's vast and that's not the most top of the line range either. Won't be proceeding will be up cycling a bit longer with plasters and tape 😬😅😅

eb949013 · 13/10/2025 09:51

Not too helpful I'm afraid because we're in London but we were lucky our architect Home Tales gave us a build estimate that we used as a benchmark for getting quotes - I'd agree with previous advice to get a few quotes but add that you need to get a very detailed list from them of what's included, we spoke to a builder we thought was a great deal but came to find things like skips and finishes we all 'uncosted extras'

TheBeaTgoeson1 · 13/10/2025 17:38

Thanks everyone!

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