concrete costs for extension footings

linda_brew

I am looking for quotes for 8 cubic metres of concrete for the footings of our new extension.

So far I have had three quotes - £1250, £650 and the third £300 per hour.

I am in North London. Do these sound reasonable?

On a different point, what are the current building regulations regarding insulation of new extension walls? I think ceilings are 80mm?

thanks

Kiran

Concrete prices vary, although its not sold by the hour??? You can look at an average price of £100/cube depends on grade/additives/fire reinforcement etc.

What do you mean by insulation of extension walls, do you mean size of cavity to be insulated?

HTH

linda_brew

thanks kiran. i think the insulation for the ceiling is a minimum 80mm i.e. celotex/kingspan. I was thinking is there a minimum insulation thickness for new walls for an extension?

oz0707

It's all about achieving a certain u valve isn't it? I had 9cu. in my footings the other week. Cost me just over £800. In the midlands. Big extension?

bobthedambuilder

linda_brew wrote: »

I am looking for quotes for 8 cubic metres of concrete for the footings of our new extension.

So far I have had three quotes - £1250, £650 and the third £300 per hour.

I'm guessing that your quotes are for supply and place the concrete in the footings.

As others have said, the material price delivered is going to be of the order of £80-100 per cu m. 8 cu m is at the top end for a single load, especially if you have access issues (an 8 cu m readymix wagon is a big beast). If you have it delivered in smaller loads, you may pay extra per cu m or a charge for the "empty space" in the drum.

Dependent upon access again, it may have to be dumped and shifted by hand, which will obviously increase the placing cost. I'd be thinking of a 4 man gang for about 1/2 a day, which could come in around the £400 mark. So your £300 per hour, including material, is not a million miles away. But you'd be better with a fixed price than an hourly rate - if there's any delays, you'll be paying the bill.

There are other ways to do it - the contractor might have one of those units where the concrete is batched and mixed on site, with a conveyor delivery. I couldn't say what that would cost - never used it.

£650 sounds too cheap for supply and place.