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.
Roof extension cost uk.
The price bracket reflects the variance of materials used the complexity of design quality of finish and where in the uk you live.
For a standard quality extension the cost of build calculates to about 1 000 m2 to 1 400 m2.
Use our free build cost calculator.
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.
Velux the least expensive option involves affixing one or two windows to the roof in order to introduce light.
Homebuilding renovating fink roof truss.
However at the very cheapest end of the spectrum replacing the felt roof on a garage should only cost around 1 000 whereas replacing all the slate tiles on a large family home may cost as much as 12 000.
Here are the average prices based on size.
These prices don t include vat charged at 20.
What options are available.
However the overall cost of a two storey extension is greater.
Estimating your build costs.
For two storey extensions add 50 to the cost of a single storey extension.
So for a 20msq extension 4m x 5m the cost will range from 22 000 to 28 000.
So the cost of an extension varies depending on the size and quality of the build.
The average cost per m2 for an extension outside of london is between 1 200 1 500.
If you want to add a bathroom or kitchen add 5 000 10 000.
It s lightweight uses relatively small timber sections and can be erected on most roofs in a day.
Bathroom extensions can be a bit more costly than you think as you have to buy the bathroom suite which can cost up to 5 000 the average medium rear bathroom extension costs around 30 000.
Dormer the most common type of loft extension in the uk today the dormer is a small flat roofed extension with a window.
It s common to have two of these on the one roof for the sake of symmetry.
In london and the south east the average cost per m2 is around 1 500 2 000.
Overall we estimate that the average cost for a roof replacement in the uk will come in at around 5 000 to 6 000.
By entering information about the extensions external size roof type number of storeys and the uk location an estimate of the building cost can be found.