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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...
andos-
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.
Mr_Smyth
"IWI seems bonkers to me”
Depends on the property. a 6th floor flat that’s not listed but has restrictions on its exterior including windows, the options were do nothing or insulate internally.
“disruption” not when it’s done as part of a refurb in an empty flat.
“Eats space” we lost 75mm off 2 walls in bedrooms and 75mm off one wall in a 6m long lounge/diner, the gains far outweighed any loss of space.
“guaranteed to cause condensation/mould” now you are just trolling, most of the flat is cavity wall and in good condition seep vents in the cavity are there for a reason IWS or not. the one single skin wall is tile faced so not breathable.
Each case/property is different, i would do it again if the property was suitable.
A shitty built victorian terrace with solid walls and a bit of slate for a damp course would be a different proposition, but then I wouldn’t ever buy one as I prefer being warm and not paying a fortune to do so.