In these days of unpredictable house price changes and an unpredictable economy it is worth really doing the sums before you commit to a house extension. Anything more than simple house extensions like conservatories really needs the services of an architect like architects for home at Ivor St, London NW1 9PL to prepare professional plans which will really add value to your property.
If it is only a simple PVC or glass conservatory you are after you might only have to fork out ten to fifteen thousand pounds, without having to worry about planning permission either. Single story side extensions, which are so common in the South East, may cost quite a lot more – from twenty to fifty thousand pounds or even more. Single story back extensions will cost a little more with some extending up to a hundred thousand pounds or so, while two story back extensions, because of the extra materials and more solid foundations needed, even more still.
The best rule of thumb when contemplating house extensions is not to exceed a reasonable percentage value of your existing property. For instance if you have a house that is worth between five hundred thousand to a million pounds, then spending fifty thousand on an extension makes good economic sense. If your house is only worth a hundred and fifty thousand then spending a third of its value again is not such good economic sense. While house extensions do generally raise the value of one’s house, be wary about what you might expect to ask for your house with its fancy new extension. In many areas of the country, especially in urban areas there tends to be a ceiling above which it is unlikely you are going to get any more for your house sale however fancy it is or however many useful additions you have made. The ceiling price is determined by the houses that surround you and the general neighbourhood.
The other important issue to consider before contemplating a house extension and how much it is going to cost is the necessity of complying with both planning permission and building regulations. The important point about these two separate sets of rules is that many extensions nowadays do not need planning permission unless the building to be modified is a listed building or you are in a designated conservation area. Building regulations however are a different kettle of fish and all new structures will need to comply with the Building Regulations. If in doubt do a bit of research on the internet or consult an architect as mentioned in the first paragraph. Local authorities normally have a lot of information on their own websites and can be contacted directly if you have any queries about what you need to comply with.
Terraced houses can generally be extended by a maximum of ten percent without planning permission or fifty cubic metres or whichever is the greater and any other house can be extended for a little more – a maximum of fifteen percent of the original building or seventy five cubic metres.


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