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Forget the idea that you can just install it yourself as a side project - this is professional work, and if something goes wrong, you'll end up paying double or triple. The costs really depend a lot on whether you're going with a wet system (in screed or concrete) or a dry system (on existing floors). Wet systems are cheaper upfront, but they take longer to cure and require you to break up your floor. Dry systems cost more in materials, but they're faster and less invasive.
For an average living room (say 20-30 square meters), you're probably looking at somewhere between €2,000 and €4,500 for a wet system, labor and materials combined. With a dry system, it's more like €3,500 to €6,000, though it can get pricier. Then you've also got costs for thermostats, controls, and possibly modifications to your heating system. It definitely pays to get quotes from a few specialist contractors, since prices vary by region and depend a lot on what your subfloor is like.
The main thing: get multiple quotes and ask about warranties. Some contractors also offer financing if it's too much to pay all at once.
The costs vary depending on your living space and whether you go for a wet system (poured into screed) or a dry system - dry is often cheaper and less invasive, but you'll need more built-up height for it. Important thing to know: with an existing apartment, you should first check whether the structure can handle it and whether your landlord will even approve it, otherwise all the planning is pointless. Are you looking at a smaller area or do you want to retrofit the whole apartment?
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I'm planning to do the whole apartment, I'm a tenant and I've already got the landlord's approval.
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