Another extension cost question!!

[morethanmama]

We want to put a large extension across the full back of our house (the current back rooms are very narrow so we hope it won't turn into a cave in the middle!).

Anyhow, the house is detached and approx 12m wide and we want to come out about 4m double storey. Does anyone have any idea as to what this should cost? I have seen £1-1500 psm quoted but am hopeful that there will be some economies of scale in a big job!!

Also, we need to get an architect to draw up plans. What is a fair quote?

Thanks in advance

I would get builders quotes as our architect was way out on costs. Builders however will caveat that without plans they can't provide more than an estimate.Until plans are drawn they can't determine the structural work needed (steel) and that's become a very expensive commodity.

If I started again I would do a cost estimate by researching all the costs for kitchen, flooring, tiles, windows and doors.For example the flooring in the new extn and kitchen cost £3.5k. We never dreamed it would be as much but cheaper options just weren't viable in the end. Or if £100k is your budget ask a builder what realistically could be achieved for that.

Good Luck

To make clear that the range I stated above was based on actual costs not estimates.

South west GB, completed within the last 18 months, experienced, small, family-owned, contractors.