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Thanks John. I have cavity wall and a fair amount of loft insulation (200mm). I may add to that at some point but I think I've done all the main things I can with insulation for now. Chris.

As it turned out, I got the quotes and they were anywhere from £1-1.5k depending on the insulation I went for and whether I replaced the floor. Compared to potential savings, it would have taken too long to earn back. Chris.

Ah OK, thank you for the help in the calculations! I may as well get the quotes anyway but at this point it looks like it's not gonna be worth it. Thanks, Chris.

Thanks John. I will have to do it more accurately when I get back bu it's currently coming up as 4.4kW compared with 4.5kW. I'm trying to work out the savings based on that. From a search, it looks like 100W costs around £1.30 per week so £67.60 per year if I'm working that out correctly?

Thanks John, I will certainly consider that then when working out if it's worth getting done at all once I get the quotes. I already have cavity wall and loft insulation at 200mm and floor insulation was on the EPC taken just before I bought the house as the biggest improvement that could be...

Thanks for the info John. I hadn't considered the issue with draughts from fibre boards. I think I will go with the mineral wool, whether I get it done or do it myself. The floorboards are made of planks. Also, I was wondering if the estimates of potential savings are realistic? I've seen...

Oh OK lol, I got the impression that laying boards on top was an alternative to the method shown in the picture but obviously not! Hopefully I will get some good quotes for this next week but I may just do it myself if not. Is there anything better than the fibre board underlay for floors in...

Hi guys, In 3 bedrooms upstairs, I have just laid laminate flooring on top of fibre board underlay and a vapour barrier. I am now moving onto downstairs and am in the process of trying to get quotes for sub floor insulation. If this turns out not to be cost effective in terms of what it will...