Double storey extension

[LovingTheSunshine]

How much would it roughly cost to do a double storey extension of 26'x15'? I am in Hertfordshire.
Many thanks

ours cost about £27,000 but that was 10 years ago.

£1200 per sq m is what I have been told recently. You'll need to work it out in feet I'm afraid

About 28K for a watertight shell.

Then extra for fittings, flooring etc - depends on what you're doing with the space.

Using the £1,200 per square metre makes a grand total of £88,500 approx for the double storey extension - does that sound about right?

I think £1,200 per m2 would be the costs for the ground floor, first floor is cheaper as you already have foundations. But could be wrong. (As in, building two storeys is not twice the job of building one.)

Thanks, edam

Yes, but then you have to factor in the roof Edam!

This is true, The Bolter. But you'd have to have a roof anyway, however many storeys you go for.

Yep - factor in about £1,200 - £1,500 per Sqm is a rough figure to use.

SO much depends on your materials, groundworks and if there are lots of strucural reinforcing. For example - if you're planning on having supporting walls knocked through or you're on a bit of a slope then that'll all add to a bog-standard pricing.

Cheers everyone - the house we viewed is not for us but the info is still useful

In excess of 30k.

Anything largely below that and I would be concerned of the workmanship.