First Floor Extension Over Flat Roof Cost

A rough building cost would be 45 000.

First floor extension over flat roof cost. House extension cost calculator are you looking for more space or thinking of buying a house and extending it yourself. However in reality our build came up much less but partly because it is a simple square ish extra room. In london and the south east the average cost per m2 is around 1 500 2 000. Timber frame construction.

This would mean you could build an extension with a floor area of 27sqm per floor. I recently built a 2nd story over a 1960 s flat roof extension didn t have to inspect the founds so building control must have been satisfied with original plans. The average cost per m2 for an extension outside of london is between 1 200 1 500. Flat roof extensions cost from 700 lowest possible and can reach up to 3 000.

1 500 per square metre for upper floors extensions per floor. However the overall cost of a two storey extension is greater. Our extension is 5m by 4 5m so 22 5 square metres. At 1 580 per m2 of extra living space this model double storey extension project offers better value for money than the flat roof single storey extension.

For two storey extensions add 50 to the cost of a single storey extension. Well before you go dreaming of sky lights and kitchen islands take a look at our house extension cost calculator below to determine how much you may expect to pay for the labour costs in england and wales. Basement extension cost guide. The ground floor would cost between 43 000 54 000 and the first floor would likely be between 27 000 35 000.

According to our research the cost of building a flat roof in the uk ranges from 1 700 to 4 500 depending on the number of rooms and the type of property you own. You ll also need a designer and contractor. For example most semi detached properties are around 9m deep and can have up to 3m from the side wall to the boundary. Many sources claim that a second storey will be priced at only half or two thirds of the cost of the first floor so if the single storey extension is 20msq and costs 22 000 the second floor could be an additional 11 000 for a total of 33 000.