Underfloor heating in a renovation: practical guide
When viable: when replacing the floor, when ceiling height allows (+3 cm) and when installing a heat pump.
When NOT recommended: if the floor is not being replaced, if ceiling height is critical, or if keeping a gas/oil boiler.
Cost: hydronic underfloor heating: €35–€55/m² (labour + materials, without floor covering). For 120 m²: €4,200–€6,600.