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Height>2.5m and proximity to a boundary for planning.
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If you read from the start, most of your questions are answered.
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Hey Alan,
I've attached the budget as it stands so far. This not entirely comprehensive, but it is accurate to within £100 I'd say. It also doesn't include a few tools I've bought for the project, which probably total a couple of hundred quid on top.
Sounds like a cool plan, I went for a dual pitched roof because I wanted extra ceiling height (I will occasionally use it as a studio space for my work, photography) and also because it looks cool as fuck. Single pitch roofs are much more common for garden rooms because they're a bit simpler, I think. It seems like people mostly use waterproof membranes to roof them, I don't know much about it. One of the best resources online for this is a youtube channel by a guy called Ali Dymock who made a single pitched, almost flat roofed, garden room and made VERY detailed videos about all the different stages. He's very informative and it's nice because almost everything to do with DIY construction on youtube is from the States, and he's British.
RE planning, there is something called 'permitted development.' this is a certain set of parameters — building height, building footprint, building footprint in relation to house footprint etc – and if your proposed building falls within these parameters you DON'T need any sort of planning, just crack on.
However, and this is where it got me, if you are building you're proposed structure within 2m of a boundary of your property these parameters shrink.
So, to use the example of the parameter that I felt limited by, an outbuilding on your property can be up to 4m total height for a dual pitch roof or 3m for any other roof type, with a maximum eaves height (wall height) of 2.5m, with no permission of any sort needed
If your building is within 2m of a boundary, however (which anyone with any sort of normal garden is going to need to do) you are limited to a maximum height 2.5m overall.
If you're building a shed that's fine, but if you want proper headroom 2.5m isn't a lot, and I had no choice but to be within 2m of a boundary. Once you start planning you gain height quick. You want your sub floor a few inches off the ground for ventilation. Then the sub floor is 200m deep, then 18mm for osb floor, then you want a decent amount of headroom so the walls are maybe 2.2m tall, you're already at 2.5 and you have even started on the roof.
You can save some of this height by doing a concrete slab instead of a raised subfloor but that has it's own costs associated with it that probably cost more than planning...
It's an easy but slow process
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nick_warner
@Alan_tbt
I’m following your garden room project with interest as it looks like I’ll need to build one as my bike store and pain cave. Without going into too much detail what do you think this will cost you in the end?
I’ll likely go for a sloping roof rather than pitched but with a large footprint and perhaps some sort of secret section for bikes to hang in which is out of site, even if you look into the room.
Also why did you have to got to planning? Is it a local restriction? I’m expecting calling it a shed would be enough to avoid that.