How much to build?


This is off topic, I cannot find the information elsewhere. I have planning permission for an extension to be built on top of my garage, it will have a pitched/hip roof.
Now the question, is there a formula for working out cost to cubic meters. I have had a quote/estimate, seemed very high.
Thx.
Joe
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Joe wrote:

There is a basic rule of thumb, but it's cost/m2. That is, take your estimate and divide it by the floor area. I'm not a cost consultant, but that figure could be anywhere between, say 300-750/m2 depending on where you live, the form of construction and the complexity of the job.
Have you got Building Regulations approval yet? The reason I ask, is because the 'adequacy' of the garage structure to sustain the additional load, can sometimes be a critical factor.
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All planning permission has be obtained from the local council including building consent. The plans have also been approved.
Thank you for your reply.
Joe
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