For two storey extensions add 50 to the cost of a single storey extension.
Roof single storey wrap around extension.
A wraparound extension is ideal if you are looking to maximise space.
A contemporary design with folding sliding doors glazed roof lanterns and large floor to ceiling glazing units would cost 1 800 to 2 200 per m so on the same budget the scale of the space may need to be reduced to around 23m.
Where a building has low ceilings it can be difficult to build an extension tall enough to integrate two full 2 4m.
If you want to add a bathroom or kitchen add 5 000 10 000.
When deciding to do a single storey extension you will need to choose between a pitched roof or a flat roof.
For instance side extensions are only permitted development where they are less than half the width of the original dwelling but the combination of a side and rear extension will likely exceed half the width of the original.
If you re looking to build an extension on a budget you can achieve a single storey extension for around 1 500 to 1 900 m for basic quality a 4m x 5m extension would work out at around 30 000 for good quality expect to pay between 1 900 to 2 200 m or 38 000 for a 4m x 5m addition.
Whether your single storey extension is flat roofed or pitched in order to create a living environment which is light and welcoming for friends and family the right rooflights or pitched roof windows can make the world of difference allowing three times as much daylight into a room than vertical windows.
Kitchen extension kitchen extensions can be built using any of the above types of extensions such as a side return extension and wrap around extension.
Flat roof extensions are a cost effective way to get the most out of your living space.
The average cost per m2 for an extension outside of london is between 1 200 1 500.
If you have a roof terrace or flat roof at the top of your property it offers in some cases an opportunity to increase.
Labour cost and time frames.
Take a look at our flat roof extension page for more ideas around flat roof extensions.
Both have their advantages and disadvantages.
Single storey extension ideas.
Planning policy requires an extension to be sympathetic to the existing house so the height of its ridge and eaves should not be taller than the existing roof.
The most expensive is a wrap around extension which is essentially a combination of rear and side return extension and these builds start at 55k.
It involves both a rear and side return to create a versatile l shaped space.
For flat roof extensions rooflights from eco are the.
The main limitation on two storey extensions is usually the roof height.
The average tradesman will usually charge around 150 250 per day in labour and for an extension job there will likely be at least two tradesmen on site every day whilst you can expect as many as 3 6 workers during the excavation and building stages for a single storey extension you will need a few different trades to complete your job.
In london and the south east the average cost per m2 is around 1 500 2 000.
How tall can a double storey extension be.
