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Think my lease is relatively favourable in terms of loft conversions. The loft space is definitely included in the demise and I'm solely responsible for maintenance of the roof. Would obviously still require consent - which would no doubt have a cost associated - but it's my understanding that the landlord 'can't unreasonably refuse' it.
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Sounds similar to mine, I think it's standard around there for some reason. I own a share of the freehold with the guy downstairs which means I didn't have a cost for the permission for the conversion. He rents it out but is responsive enough (although to be honest pretty much all it involves is us paying buildings insurance each year).
You can download the Land Registry data from here https://www.gov.uk/government/statistical-data-sets/price-paid-data-downloads to make it reasonably quick to search through the surrounding area. When I remortgaged last year and needed a value I just looked at two or three streets either side and that gave enough options to take a guess at the value.
If you do buy the freehold then it does give you options for extensions, loft conversions, etc if that is a consideration. Obviously partly depends on your lease.