I have read a lot of threads here but would still like some advice concerning an extension. We get on well with our neighbours and they were very good to us, in that they looked after our house for some time while we were away for a time. They have told us that they are looking into getting an extension, building onto the back of the house. We haven't seen the plans yet but it will not require planning permission. Our houses are build in an L-Shape at the back, so they want to fill in the L-shape and make it square. They would like to build the extension right up to the boundary between our houses, marked by a fence at the moment. They say then if we wanted to extend later, we could use this wall too. Fine. But we have no intention of extending and may even intend to sell in the next couple of years. I have read various posts here and I'm now terrified of gutters and roof overhanging. I also wonder will our back wall get damp due to lack of light. Certainly the back room which has a sliding glass double door will be as dark as hell as it will now sit between our L-shape kitchen and their extension, like at the end of a wide alley. Is there a possibility of a damp wall here? Please say no! Our neighbours are very decent people so we would like to accommodate them as much as possible. But if we are selling later, we don't want to lose potential buyers because of their extension. They were very good to look after our house but at the same time, all our money is in our house. We can't afford to let the value drop any more than it has already. We feel we will need to get an architect or solicitor to answer our questions when we see the plans. 1 Who can tell us more? A solicitor or architect? 2 Should we allow them to build up to the boundary wall? Would this be a possible advantage, if someone did want to extend our house later? Or is it just bad news, to be avoided at all costs! 3 How does a parapit wall work? Would it work with a roof that would be stretching across the entire back of the house. They intend to lower existing roof and simply add on to bring it across entire back of property? As I say, we do want to accommodate them as much as possible... Thanks in advance.