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From what I understand it's specifically flats that need planning permission, type of lease isn't relevant. I thought dormers were ok but for some reason with flats there are restrictions on how close you can go to the back wall.
I'm in a similar situation in that I definitely own the loft space. Strictly leasehold in my case tho'.
Brun-
Yes, the permission from the property owner isn't an issue for me, it's exactly what the impact is of being a flat rather than house and what restrictions there are going through planning permission rather than permitted development.
Looking at approved applications from around me it's hard to tell exactly what the rules are (I have a feeling that you're in the same area as I am for some reason).
The council (Haringey) appears to be the next step although they appear to charge for pre-application advice.
aggi
I'm about 95% certain I own the loft, slightly open to interpretation in the documents but pretty clear I think. Plus I've talked to the guy who owns downstairs (it's a house split into two flats, we each own a flat and jointly own the freehold of the house) and he has no issue with the proposal. No mention has been made of any uplift amount, although I will be doing some work on the roof and bearing the cost at the same time.