I am thinking of converting my loft into a bedroom and I was wondering how to measure the cubic metres to see if I am within permitted development. I have looked on the planning portal and their volume calculator implies that the measurements are taken for the width, height and depth (on the outside). The roof though isn't a box or rectangle shape, it has slopes and will be wider at the bottom than the top. How do I take account of these variations? More importantly what would planners or building regs demand?
Measuring cubic metres for a loft conversion
- Thread starter Boxers
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It's not easy to explain - especially without seeing the shape you are talking about. Basically most built shapes can be reduced to squares or triangles. work out the areas and multiply by the lengths of each. Then add them all together.
I have attached a crude drawing. The dimensions are:
width at eaves is 12m
height from eaves to ridge 2.4m
depth is 3.2m
It is essentially the width and shape of the existing hip roof. I think it's more than the PD allowances but multiplying the three figures above doesn't take into account the slopes. A supplementary question is are lofts that are more than PD allowed?
hope this helps.
width at eaves is 12m
height from eaves to ridge 2.4m
depth is 3.2m
It is essentially the width and shape of the existing hip roof. I think it's more than the PD allowances but multiplying the three figures above doesn't take into account the slopes. A supplementary question is are lofts that are more than PD allowed?
hope this helps.
I have visited the planning portal again and used their calulator for dormers, put my measurements in and the tool returns a figure within the PD allowance. When I simply multiply width by depth by height on a calculator I get a much larger total. Presumably the volume calculator's logic is different to simple maths? As you'll gather maths isn't my strong point.
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And remember not to measure the whole internal roof area - just the area which is being converted ..... so you can deduct the unused space at eaves and if you have any space up under the ridge above a new ceiling
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