1.6m x 1.0m panels weigh about 18kg. I think the tiles weigh significantly more especially when wet.I am going through that process at the moment so know a bit about removing a defunct chimney. I'm mostly taking it down due to a leak which I think is from the top haunching, but to be honest I don't need the chimney, it's draughty, and the chimney breast takes up a lot of space in one of the bedrooms. I submitted a simple building control notice which I think cost me £130 as the total cost was under £2k. I got in a Structual Engineer to do calculations on replacement timbers on the roof. That cost me about £300. As I mentioned earlier the biggest cost will be scaffolding. But the OP may want to strongly consider a SE anyway to check the roof timbers can support the additional weight of the panels. I know if I was buying house with PV on, Id be mostly concerned about the integrity of the roof structure and waterproofing.
@Trevor Larkum - do you install in-roof pv? Someone on here posted some photos of their property, which was almost like a replacement roof from metal sheet panels, with the PV bolted through. There were no tiles under the panels. Seemed a very smart way to reduce unnecessary loading and avoid hooks etc.
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