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Not sure why they would take a dim view provided there are no structural issues. The days of employing young maids to lug coal up to the third floor are long gone. Seriously, who is going to light coal fires on the top floors of old houses these days? All concrete should ideally be vibrated...

Good point, thanks. I will look at those ideas. I spent the afternoon measuring the chimney heights and flu areas to calculate the volumes. The total extra weight using a density of 1.75 for the lined chimneys and 2.4 for the unlined chimneys is 8.7 tonnes. The load bearing horizontal area...

Yes there is a cost but the building has to have scaffolding from front to rear and over the roof on either side of the stack to line the other two flues anyway so the incremental cost is the concrete to fill the four flues and some labour. Once filled they can no longer be a source of damp...

Good point, thanks. In theory this is true but in reality they are not conveniently located to facilitate alternative uses. The choices are either to leave them open and ventilate them or fill them completely.

I have six fireplaces, each with its own flu and pot, in an 1890s house in the UK. At least four of the flues will never be used again. One of the other two is now lined and I may line the other. Is there any reason not to fill the redundant flues with concrete to the top of the chimney...