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Hi all.

We have had quotes in for some building work to extend a house and convert the loft. Our research tells us we should expect around £1500-£2000 per square metre for extension work, and we have subsequently backed this up by way of some friend who had similar work done. (All subject to fit and finish of course.)

We have been quoted just over £4000 per square metre which is way out of scope! 

I am just after anyone's experiences in this area to add comment. We are awaiting another couple of quotes. 

Our current speculation is the builder doesn't want the job. There certainly isn't anything complicated or bespoke about the work! 

Many thanks.


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1.5 to 2k /m is approx correct, depending on scale, specification, etc; but you can end up at 4k if there is a disproportionate allowance for fit out of kitchen, complex roof, poor ground conditions, high spec windows/doors, poor access/site constraints, etc.  
If you do not have the works scheduled it’s difficult to analyse a lump sum; and rates for loft conversion will/should be lower than an extension. Did you receive a priced schedule ? 

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Hi Alastair,

In the quote there is no kitchen or windows...!

The only potential difficulty is we have a Leylandii to the side which will require some investigation for the foundations. But there is no specific mention of it in the quote. We have spoken to someone about this to get some calcs done. Otherwise the build is very simple and straight forward - deliberately so! 

We do have an itemized quotation, but it's quite generic in its format. EG, it lists "timber" then a price. Rather than "timbers for roof - replace existing engineered trusses". So we have been able to decipher some of the items. 

I think most astonishingly was the plastering at £12k. The previous house we probably spent less than £3k and this will have no more. Certainly not 4x more! 

We are waiting for the second builder to quote - due imminently. We'll have a direct comparison then. Then if needed we'll go back to discuss and understand better this quote.

As an aside, at £4k m2, we stand to only just about break-even on the project. At £2k we are in for healthy profit! Hence keen and grateful to have some confirmation our research was right. 


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