JennyC wrote:
[...]
The spot I have in mind is 'above' the garage :~))

If it's _above_ the garage, are you confident that the roof timbers
are strong enough? I'd hate you to fall through, halfway through the
best painting you'd ever done.

And I hope you haven't got neighbours who might get all
planning-permissionish -- we have some of those even here in urg!

--
Mike.