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late to the party but if it helps - i think i spent c.£1200-1400 for around 30m2 (plus rockwool insulation at £300 or so)
We were on the first floor though so i didn't have to worry about a membrane.
Used the profix 15mm system - which i'd recommend, easy to install, similar price to screedboards and has peformed super well. We have 15mm engineered wood on top of it, and the floor sits between 24-27 degrees depending on heating controls. I never wear socks because my feet get too hot and the main room - which has a big bay window and rear sash and have not been refurbed - keeps around 20 degrees all the time.
it will raise your floor height if you go directly on top of floorboards and you need to check weights for the screed (which work out around 25-30kg m2)
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terlg
Anyone got a very ballpark figure for how much it might cost to lift floorboards, remove rads, install underfloor heating and insulation on the ground floor of a Victorian terrace?