Hi, I've been fighting to get our garden under control for a while now (previous owner left it more than messy) and I'm finally up to the last bit - the shed! The shed itself is falling down a bit so needs fixing up but really I want to replace it completely with a custom built big shed / outhouse type thing that's big enough to fit garden tools one end and my gym at the other with a bit of space off to the side for a mini workshop. But I've got 3 big problems in the form of huge 20 to 25m tall trees on the left of the existing shed. The shed itself looks to be sat on a 100mm deep concrete slab, no cracks in it currently and it doesn't look to have moved. I've taken a quick pic; http://www.lies.org.uk/shed_space.jpg The dark red is the grounds outline. Bright red is where I want the new shed. Dark green is the concrete slab under the current shed. Light green are some mostly dead trees I'm planning on removing to make space. Cyan is the back of someone's really odd shed, its a good 5m long but barely 2m wide! I noticed when cleaning up that its actually got a brick wall around it at the tree end. Forgive the mess but I've been doing the garden from the patio backwards! (I wish I'd done it the other way round but bit late now) I'm basically looking for the best option that's not going to make the trees fall over but gives me the strength to take the gym equipment and I've never done anything like this around such big trees. I was originally thinking of a raft foundation with rebar for added strength but like I said I don't want these trees falling over as they'd easily take out a couple of sheds and maybe conservatories depending which way they fell. Any pointers would be much appreciated!