Underfloor Heating Installation Cost London 2026: Wet vs Electric Systems

Wet vs Electric Underfloor Heating: The Fundamental Cost Difference

Underfloor heating systems in London fall into two categories: wet systems, which circulate warm water through pipes embedded in or laid on the floor, and electric systems, which use resistance heating cables or mats laid under the floor finish. The two systems have fundamentally different installation costs and running costs, and the choice between them depends primarily on whether the installation is in a new build or extension where the floor can be designed around the system, or in an existing property where disruption and installation cost must be minimised.

Wet underfloor heating is cheaper to run per unit of heat output because it operates at lower flow temperatures than a conventional radiator system, making it more compatible with modern condensing boilers and heat pumps. However, the installation cost is significantly higher, particularly in retrofit situations, because the pipework must be embedded in a screed or placed in a low-profile system board, both of which add significant material and labour cost. Electric underfloor heating has a much lower installation cost but higher running costs because it uses electricity directly as the heat source.

Electric Underfloor Heating Installation Costs in London in 2026

Electric underfloor heating using a cable mat or loose cable system is the most cost-effective solution for individual rooms, particularly bathrooms, where the system can be laid under floor tiles during a renovation. The installed cost of an electric underfloor heating mat in London in 2026 is approximately eighty to one hundred and forty pounds per square metre for supply and installation in a straightforward single-room application. This includes the heating mat, the floor thermostat, the electrical connection, and the commissioning. A standard bathroom of four square metres would therefore cost approximately three hundred and twenty to five hundred and sixty pounds for the underfloor heating element of a renovation.

Electric underfloor heating is not typically cost-effective as a primary heating source for large areas because the electricity running costs would be prohibitive. It is best suited as supplementary heating in rooms where radiant warmth underfoot is the primary benefit, such as bathrooms and kitchen areas with stone or tile floors. For rooms where the underfloor heating is intended to be the primary heat source, a wet system connected to the central heating boiler is the appropriate specification.

Wet Underfloor Heating Installation Costs in London in 2026

Wet underfloor heating for a new build ground floor or a ground floor extension in London in 2026 typically costs between one hundred and twenty and two hundred and twenty pounds per square metre for supply and installation, including the manifold, pipework, screeding or system board, and connection to the boiler or heat pump. A twenty-five square metre open-plan kitchen-diner in a London extension would therefore cost approximately three thousand to five thousand five hundred pounds for the underfloor heating installation.

Retrofit wet underfloor heating in an existing London property is considerably more expensive because the existing floor finish and often the floor construction must be removed to accommodate the system. Low-profile wet underfloor heating systems using aluminium heat spreader plates in a timber subfloor can be installed at lower cost and with less disruption than a full screed system, and are appropriate for upper floors and for properties where the floor-to-ceiling height cannot accommodate the additional screed depth. Prestige Engineers install both wet and electric underfloor heating systems in London properties and can advise on the most appropriate system specification for each project during the quotation visit.