Cost Of Ground Floor Extension

If you have time consider being your own project manager.

Cost of ground floor extension. For two storey extensions add 50 to the cost of a single storey extension. Professional project fee costs. If you need a structural engineer to size roof joists and foundations factor in.

Budget for architect design fees from three to seven per cent of the construction cost. Choose a simple design the most cost effective floor plan is square future buyers will appreciate neutrality too plan ahead as much possible. However in reality our build came up much less but partly because it is a simple square ish extra room.

As a general rule an 80 square metre ground floor extension costs between 164 500 and 310 000. This roughly translates to around 30 000. For example a single storey 25 square metre extension may cost 33 000 a two storey extension will be around 53 000.

1 500 per square metre for upper floors extensions per floor. The average cost per m2 for an extension outside of london is between 1 200 1 500. You also have to consider the areas to be refurbished as a result of the works.

In london and the south east the average cost per m2 is around 1 500 2 000. That puts the fee for an extension of 30 000 at 900 to 2 100 for example. For a double storey extension you are looking at about 160 of the cost for a single storey extension of the same floor area.

Tips to cut the cost of your extension. A rough building cost would be 45 000. There are so many home extension ideas to choose from that there is one to suit any budget.