Can I Convert my London Loft?

Looking for extra space in your home but understandably reluctant to move because you love the area you’re in? It’s at this point that many householders consider a London loft conversion.

Certainly, if you’re not using the loft for storage then that is a lot of potential home space going to waste. And, really, do you need half the stuff stored away in there anyway? Perhaps not when you consider it’s possible to turn it all into a new room within the space of around 10 weeks!

Planning requirements for a London loft conversion

Still, how can you tell if your loft is suitable to turn into an office, spare bedroom, teenager den etc? Well there are legal requirements.

The first is that there has to be a head clearance height of 2.3 metres. If your house was built in the 60s or later then you’re in luck as most have this. If it was earlier than this then it’s worth getting in a specialist to double check before you go start making any plans. It is possible to lower the ceiling of the rooms below, but this will, of course, add pretty substantially to the cost of your loft conversion in the capital.

Other obstacles that can get in the way of a good London loft conversation include a chimney and even an old water tank. The pitch of the roof shouldn’t be too steep either (30 degrees or more is ideal).

If you live in a house which is listed or sits in a conservation area then planning permission will certainly be necessary.

Permitted development rules

As a rule, you don’t need planning permission from your local council for building a loft. That’s because since 2011 this type of construction and property design work has come under the category of permitted development. If you live in a detached house though you will need a party wall agreement with the neighbours.

There are conditions however – and your designer will no doubt advise you on these. Basically, they refer to the width and height of your London loft conversion ie it must not be larger than 40 cub metres (terraced house) and 50 cubic metres (detached and semi-detached homes). Nor must the city loft extension be higher than the roof or overhang any walls.

In order to protect the privacy of neighbours any side windows must be obscure-glazed.

Different types of loft conversions

There are four main types of loft conversions around today. These are:

· Velux. This is basically a way of adding light via windows to a loft room (Velux being the name of the windows used). The windows take the form of skylights and the structure of the loft doesn’t alter.

· Dormer. Great for bungalows, these add extra floor space, (usually at the front of the loft) and are shaped like a rectangular box. It’s also possible to add on a side dormer so that the entire conversion is L-shaped.

· Mansard. The largest type of conversion, this includes adding on extra space to the roof horizontally and vertically. It can provide enough floor space for a couple of additional rooms, but it does require planning permission.

· Hip to Gable. This is when the sloping roof is replaced with a vertical wall (therefore extending the space at the side/s). Again, it requires planning permission.

Get in touch with our team of London architects and engineers for more advice and help on a contemporary loft conversion in London today. Tel: 07449745698 or write to us at