Underfloor Heating in a New Build: Costs, Heat Pump and Build-Up
In a new build, underfloor heating is regarded as standard because it runs on low flow temperatures and pairs optimally with a heat pump. This guide explains the efficient interplay, the build-up with screed and realistic costs per square metre. With notes on single-room control, floor coverings and the sluggish response behaviour.
In new builds, underfloor heating (Fußbodenheizung) has long established itself as the standard — and for good reason: it releases the heat evenly across the entire surface, makes do with low flow temperatures and therefore pairs best with a heat pump. At the same time, there is a fair amount to consider — from the screed build-up and individual room control to the choice of floor covering and the heating's sluggish response behaviour. This guide shows why the combination of underfloor heating and heat pump is so efficient, how the build-up works, which costs per square metre are realistic and what you should pay attention to with control and floor coverings. You can work out the additional costs in the prefab house cost calculator.
Why is underfloor heating standard in new builds?
Short answer: Underfloor heating is so widespread in new builds because it makes do with low flow temperatures and releases the heat over a large area and evenly. This harmonises best with modern, well-insulated houses and above all with the heat pump, which runs particularly efficiently at low flow temperatures. In addition: there are no visible radiators, the rooms can be furnished freely, and many perceive the radiant heat as pleasant. The expenditure stays manageable in a new build because the pipes are installed anyway during the screed laying. For most new builds it is therefore the obvious choice.
The crucial point is the large heating surface: since the entire floor releases heat, a lower temperature of the heating water is enough than with classic radiators, which have to release a lot of heat at specific points. It is exactly this low flow temperature that makes the combination with a heat pump so economical — how this technology works in a prefab house is explained by the guide to the heat pump in a prefab house. In well-insulated new builds, the surface heating plays out its advantages particularly well.
How does underfloor heating fit with a heat pump?
Short answer: Underfloor heating and heat pump are a well-rehearsed duo. The heat pump works the more efficiently the lower the required flow temperature turns out — and thanks to its large surface, underfloor heating makes do with comparatively low temperatures. While radiators often demand higher flow temperatures, the surface heating is fine with a significantly lower value. This raises the heat pump's seasonal performance factor and lowers the electricity costs. A clean sizing is decisive: pipe spacing, insulation and the setting of the heating curve must be coordinated with one another. Planned correctly, an efficient, comfortable and future-proof heating system arises.
The flow temperature is the most important lever for efficiency: every degree less improves the heat pump's performance factor. It is therefore worthwhile designing the underfloor heating for low temperatures from the start — for example through close pipe spacing and good insulation of the house. In combination with a photovoltaic system, a large part of the heating electricity can be generated yourself. General background information on the operating principle of a heat pump makes it easier to understand this interplay.
Design for a low flow temperature
Ask the planner to design the underfloor heating for the lowest possible flow temperature. Close pipe spacing and good building insulation make this possible. The lower the temperature, the more efficiently the heat pump works — this shows up over the entire useful life in lower electricity costs.
What is the build-up with screed?
Short answer: The underfloor heating is laid as a pipe system on an insulation layer and then embedded in the screed, which stores the heat and passes it evenly on to the room. Wet screed is widespread; it needs a drying and covering-readiness time before the floor covering may be laid. Dry systems make do with a lower build-up height and are ready to cover more quickly, but store less heat. What is important are continuous insulation downwards, a careful heat-up protocol and adherence to the covering readiness. A clean build-up forms the basis for even heat and a permanently crack-free floor.
With wet screed, patience is needed: the screed must dry out sufficiently, and before laying the covering it is heated up in a controlled way (function and covering-readiness heating). Anyone who skips this step risks cracks in the covering or moisture damage. You should include the build-up height of the underfloor heating in the planning early, so that doors, connections and transitions fit. How such trades slot into the overall sequence is shown by the guide to the construction process.
Plan the heating system and house from a single source
Underfloor heating, heat pump and insulation usually form a coordinated package in a prefab house. Through our network you receive, free and without obligation, quotes from several manufacturers who design the heating concept to suit the house — that way you avoid expensive compromises and retrofitting.
What does underfloor heating cost per square metre?
Short answer: The costs depend on the system, area and installation situation and can only be quantified as a rough range. In a new build, underfloor heating in 2026 usually sits in a moderate range per square metre, depending on execution and region — in a new build this is often cheaper than a retrofitted installation in an existing property, because it is installed together with the screed. Dry systems with a low build-up height can turn out more expensive than classic wet systems. To the bare laying costs are added control, manifold and integration into the heating technology. Obtain several quotes in order to get a realistic price basis.
System variants of underfloor heating in a new build
| System | Build-up height | Property |
|---|---|---|
| Wet screed | higher | good heat storage, longer drying |
| Dry system | low | quickly ready to cover, less storage mass |
| Thin-layer/milling system | very low | more typical for renovation |
Since underfloor heating is installed with the screed anyway in a new build, the surcharge compared with radiators stays limited — and through the efficient combination with the heat pump it pays off in operation. For heating technology overall, funding often comes into question in 2026; an overview of state programmes is offered by the guide to KfW funding 2026. Factor in the ongoing running costs, not just the purchase price.
How do room-by-room control and floor coverings work?
Short answer: With room-by-room control (Einzelraumregelung), the temperature can be set separately for each room — via room thermostats that control the heating circuits at the manifold. That way bedrooms stay cooler and living rooms warmer. With floor coverings, suitability matters: tiles and natural stone conduct the heat very well; many parquet, laminate and vinyl coverings are also suitable, provided they are expressly approved for underfloor heating and have a low thermal resistance. Thick carpets or unsuitable coverings slow down the heat output. When buying a covering, always pay attention to the manufacturer's approval for surface heating.
- Plan room-by-room control with room thermostats per room.
- Choose floor coverings with a manufacturer's approval for underfloor heating.
- Pay attention to a low thermal resistance of the covering.
- Avoid thick carpets — they slow down the heat output.
- Have the heating curve and control set professionally after moving in.
To put room-by-room control into context: it increases comfort but should be considered together with the low flow temperature so that efficiency is preserved. A hydraulic balancing ensures that all rooms are supplied evenly. For the coverings the rule is: anyone who knows early which floor they want can coordinate build-up and approvals in good time and avoid later problems.
How do I deal with the sluggish response behaviour?
Short answer: Underfloor heating responds more sluggishly than a radiator: because of the storage mass of the screed, it takes longer for a changed setting to show in the room. This is not a disadvantage but a characteristic of the system — you heat less with short-term temperature jumps than with an even base warmth. Instead of constantly ramping the heating up and down, you set a suitable heating curve and let the system run continuously. In well-insulated new builds the screed holds the heat for a long time, so that the sluggishness barely matters in everyday life. Short-term "top-up heating" at the push of a button is therefore not the right operating concept.
In practice this means: underfloor heating plays out its strength in continuous operation with a well-set heating curve that is oriented towards the outdoor temperature. Frequent manual adjustment achieves little and can even worsen efficiency. In a well-insulated house the temperature fluctuations stay low anyway. Anyone who has internalised the operating concept usually perceives the even heat as particularly pleasant — an advantage that more than makes up for the somewhat more sluggish response.
Heating curve instead of constant adjustment
The key to economical operation is a well-set heating curve, not constant adjustment at the thermostat. Have the system set professionally after moving in and the hydraulic balancing carried out. After that, the underfloor heating runs efficiently and comfortably in even base operation.
Find an efficient heating concept for your prefab house
Underfloor heating, heat pump and good insulation together make an economical, comfortable heating system. We put you in touch, free and without obligation, with suitable prefab house manufacturers from our network who tailor the concept to your house — transparently costed and planned to be eligible for funding.
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Compare house prices nowImportant questions briefly explained
The most common price questions around Underfloor Heating in a New Build – answered concisely by the Prefabricated House editorial team (as of 2026).
