Insulating sandstone cavity walls

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Hi,

My home is 1930's semi detached. It is made of bottom part Yorkshire stone, Top half bricks as its rendered and pebbledashed

Although double glazed, it is pretty cold without the heating being on for long periods of time.

I've come to realise that this is because of the external walls are very cold due to no cavity wall insulation.

Since this would be classed as a hard-to-treat wall, could anyone please advise if it's safe to have cavity wall insulation in these type of walls and would polyurethane foam be okay?
 
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Are you sure it's built with a cavity? I've lived and do still live in old properties which have never had a cavity.
 
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Yes it has a narrow cavity. Question is firstly is it safe and wise to full a yorkshire stone hard-to-treat cavity with insulation?
 
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If it has got a narrow cavity, what would be the point?
 
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