How much does an extension cast?

[momb]

I know: it's a 'how long is a piece of string' question, buit before I start thinking about it too sertiously, can anyone give me any idea what a single storey extension with pitched roof (say 12' x 25'?) might cost: thousands, tens, teens, fifty, hundred thou ??? I have absolutely no idea!
Thanks

seriously, not sertiously

Is that metres or feet?

Very hard to say. Depends like if you are having it as a kitchen/utility as it will need more utilities ( water/gas etc) than a lounge area.

There are plenty of rough and ready calculators online, for example:
www.whatprice.co.uk/costs/extension-costs.php
Most use metres rather than feet, so you'd be looking at about approx. 3.5m x 7m.

Thanks for that. Very useful!