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No Idea how much external is but we spent about 2k on materials and 1.5k on extra labour for 3 rooms 5 external walls, the rest was DIY. I did all the fiddly stuff like the rebates, boarding the window reveals and making the big lounge window sill level for new sills.
Plus the pipe channel covering with plasterboard level with the insulation and lining with superfoil.
The finishing details and edges are what take time.Probably be several years to get that investment back along with 7k of secondary glazing but that’s not factoring in how it feels to be warm. Anecdotal from other flats with no energy saving measures beyond thick curtains they are spending £250 a month on gas/electricity right through the year. It would need a month of 0° or lower temps for us to pay that in winter with us here all day.
When we eventually move again I would insulate in whichever way possible as long as we could stomach the cost and DIY if able.
A bungalow with cavity walls and a big soffit overhang would be ideal as I don’t do working at height.
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Mr_Smyth
Also depends on finance too. I could feasibly install IWI for a few rooms that we would benefit most from. I cannot afford to install external insulation...