Okay, using some of the equity from the house, I think we're going to build an extension. Really, we want a double-storey extension, extending the lounge and kitchen on the ground floor, and the 2 bedrooms at the back. I'm having a builder over for a feasibility quote on the 24th, but obviously that will be for them to project manage the whole lot - foundations, brickies, roffers, plasterers, etc. Do I do this first, or would it be better to get an architect in to size up first? Next door has a single storey extension, and we'll go with that if we can't get planning permission for a double, although what I really want is a single storey brick extension, with a flat-roof bit on top to extend the bedrooms. My best bet may be to manage it myself - I'm not under any (particular) timescale apart from the other half, so I should be able to work around schedule conflicts quite easily - that will be the cheapest option. I should probably point out that I'm not allowed to lay the bricks/blocks myself, as the other half wants the walls "In straight lines". Ramble over, time for the Question: Has anyone built their own extension? If so, what problems should I expect to face? What else do I need to think about? Did you encounter any major problems that noone told you about? Thanks all!