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Normally you'd need planning permission, yes, although some local authorities have a policy of allowing them without. If it blocked light to a basement flat then there may well be issues of interference with a right of light, yep. Rights of lights are an exception to the general rule that lessees can't acquire prescriptive easements against the lessor.
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My local authority (Waltham Forest) published this guide to bike sheds - https://www.walthamforest.gov.uk/node/6413
There may be a similar thing for your area.
In short:
- 2m x 1m x 1.5m max
- perpendicular to highway, ie side boundary
- non-obstrusive colour
- 2m x 1m x 1.5m max
Bike/ bin stores in front of houses, I see these around, more so in Bristol, but aren't they forbidden under 'outhouse' permitted planning laws?
I guess you'd need proper planning permission right? In which case I'm likely to fall foul of 'right to light' in a Victorian terrace.