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Hi All, We're considering replacing an existing single storey lean-to extension with new structure, essentially on the same footprint. We're in a detatched house with plenty of space around. I've read the PD documentation and couldn't find anything specifically relating to this situation. The current extension consists of a brick built wall about 1m high with conservatory style glazing above and a glass roof which constitutes a porch area. We would like to replace the structure with something more substantial and better insulated then knock through to create a larger kitchen. Construction would probably be rendered block to harmonise with the section of building it will adjoin. A new casement window will be fitted to the front elevation (significantly smaller than the existing glazed area) and one or two roof windows would be fitted). Do you think we need PP or will PD cover it? Or would neither apply if it were considered to be just an improvement of the existing structure?

It has been suggested (see the other thread) that a traditional "lean to" might be a better option than a Garden Room (sigh). And I was ready to push the button. What we are talking about is an unheated lean to on the side area of a house against a blank wall with, perhaps, a roof of corrugated polycarbonate or 2/3 layer polycarb as is used on some conservatories. It will be dry but unheated. If you think of a car port with the walls enclosed you get the idea. There will be a door to the back, and probably will not be a door to the front. There may be a door leading into the house, which would be an external quality upvc door - I may need a door there later anyway, so that is not an issue. I can add the door later if that will simplify matters. The floor will probably be slabbed. Cladding (including the roof) could be transparent, translucent, or even opaque. I know that Planning will not apply, as the area under 15sqm, never mind 30sqm, it is on the side of the house behind the line of the principal elevation, and we are not "designated" in any way, and PD rights have not been removed. This is in England. Max height will be under whatever is the PD limit - 3m? Which leaves me stroking my non-existent whiskers about how Building Regulations would apply. The objective is probably that they should *not* apply for reasons of simplicity. I will call up the BCO tomorrow for a chat. In Building Regs terms is it a shed, an extension, a garage or a conservatory? And which are subject to building regs in that situation? In one sense it is almost like a small yard with a roof. I may even be able to make it into whichever I need by mixing my cladding. Although the lean to will be concealed behind a 2m attractive fence, I need to be able to defend my position if someone complains. Any comments are welcome. Ferdinand