Underfloor heating is easy to justify in a new build, where it goes in before the floor exists. Retrofitting it into an existing home is a different question, and the answer depends on which type you’re considering and what floor you’re starting with.

Wet Systems vs Electric Systems

Wet underfloor heating runs warm water through pipes connected to your boiler, and it’s more efficient to run but needs more floor buildup height, which matters in a renovation where you’re not starting from a bare subfloor. Electric systems sit closer to the surface and are simpler to retrofit, but cost more to run day to day.

Floor Type Changes the Difficulty

Retrofitting under tile or stone is far more straightforward than under an existing solid concrete floor, where you may be looking at reducing floor buildup or accepting a slight rise in floor level. Timber floors sit somewhere in between, depending on the joist depth and whether it’s suspended or solid.

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Where It Makes the Most Sense

A full renovation where the floor is already being replaced is the ideal time to add underfloor heating, since the extra cost is mainly the system itself rather than the disruption of lifting a floor that would otherwise stay untouched. Adding it purely on its own, without other floor work planned, is a bigger job to justify.

What It Won’t Do

Underfloor heating alone in a poorly insulated room won’t solve a cold house. It performs best alongside decent insulation, and in a genuinely draughty room, the heat loss will undermine the benefit before it undermines the cost.

If you’re renovating and considering underfloor heating, get in touch and we’ll tell you honestly whether it makes sense for your specific floor and room.