Building estimate

Can anyone provide a rough estimate/rule of thumb of the cost per sq. ft. of adding an extension to a house. Single storey and double storey. Just a very rough estimate would suffice.

Reply to
fred
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cheap and easy and bare £60 a sqaure foot Average £100 a sq ft. bare London flat £200 a sq ft.

Cost of fittng it out with evertyhing to make it a home - carpet, wallpaper, curtains, lighting that actually is pleasant, CH, ethernet TV and phone, furniture and so on - expect £100 a sq ft.

Reply to
The Natural Philosopher

I think the OP will have to state where he lives as prices can and do very quite widely depending on area..

Reply to
tony sayer

That worked for me three years ago. 22 sqm came in at just under £20,000 to the builder plus the cost of decorating/carpet.

Reply to
Peter Johnson

As a matter of interest, do you recall the total costs? Architect? Drawings? PP/BCO etc?

Reply to
newshound

Precisely the sort of thing I was looking for when I did my extension.....

Cambridge, 2012: Two storey extension - ground floor extended by 16sqm, fir st floor by 11sqm. Cedar clad, two velux windows, one sun tunnel, and some complicated roofing with a new gable and two valleys, plus a box gutter whe re a vertical wall joined an existing pitched roof. Pitched roof on the 5sq m that was only 1 storey. Bifolds arranged separately. Minor rearrangement of surface water drainage, plus a box gutter. Two knock throughs with new l intels, one of which was three glulams joined together, so quite substantia l! Wet UFH on ground floor, radiator on top floor.

Does not include decoration, floor final surface, 2nd fix carpentry, or re instating any sort of surface where the foundations had been dug out.

Design fees 1075 Planning and BC application: 636 Structural engineer: 264 Basic build, plastered. 29402 (so that's 1130/sqm) Extra for increased depth on foundations: 600 (we had to go down to 1.8m!) Bifold doors, installed: 3423

Reply to
bblaukopf

Most helpful, thanks very much. The "overheads" are quite pleasantly moderate.

Reply to
newshound

The design fees could probably be reduced - having seen the drawings, I'd b e happy to do them myself next time, and the same goes for the structural e ngineer - he was useless, and I ended up redoing most of the calcs (I did d o engineering at university). While it wouldn't reduce the cost much, it wo uld get rid of the feeling of spending 2 grand before anyone picked up a sh ovel!

It might also be worth pointing out that while the above totals 35K, we act ually spent 45K by the time we added all the things that made sense to do a t the same time:

- i.e reskimming and rewiring a couple of rooms, some decking outside, ski rting, some extra lighting, new shed and base (we had to demolish the old s hed to make room for the extension), floor finishes, various other bits of electrical work, and decorating!

It *could* have been 35K all in (or less) if I'd DIYed everything that I co uld do - but the days when I had the time to do that are long since gone! T he tiling would have been a site bit better too....

Reply to
bblaukopf

Yes not that difficult are they?..

Can you say or give us a clue as to who that was?.

;!...

Easily done .. a neighbour here spent 70K on a small kitchen extension around 15 x 5 feet..

Plus more in solicitors fees for the dispute resolution afterwards then they went bust!..

Always some little extras;!..

Can't get the staff it sometimes seems...

Reply to
tony sayer

Obviously when I said "he was useless" I intended to write "in my view, he was useless" :)

If you want to know, send me an email. I also know of a structural engineer who, while I have not used him, I would trust him -

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- I did my degree with him, and he did extre mely well. He was also the only guy I ever saw doing his technical drawing practicals in pen, which obviously prevented erasing any mistakes. He didn' t make any.

While strictly speaking that's almost accurate, what I meant was "a sight b it better..."

Reply to
bblaukopf

Still doesn't scan right ?

Jim K

Reply to
Jim K

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