Underfloor Heating Installation & Pricing Guide UK 2026 — For Plumbers & Heating Engineers

Wet vs Electric UFH: Which Is Right?

Every UFH enquiry starts with the same question: wet system or electric? The answer depends on the building, the heat source, and how the room is used.

Wet (hydronic) UFH circulates warm water through pipe loops embedded in the floor. It is the right choice for whole-house or whole-floor installations, new builds, extensions, and any property with a heat pump. Running costs are lower than electric because the heat source is a boiler or heat pump rather than direct electrical resistance. It is a bigger installation job with more components — manifold, pipe, actuators, wiring centre, screed or overlay system — but it commands a significantly higher invoice.

Electric mat UFH uses resistance heating elements woven into a mat, laid beneath the floor finish. Installation is simple: the mat goes down, the tiles or LVT go over it, the thermostat is wired in. It is ideal for individual rooms used intermittently — bathrooms, en-suites, kitchens — where spot comfort heating is the goal rather than replacing the primary heat source. Running costs are considerably higher than wet UFH because electricity costs roughly four times as much per kWh as gas (and twice as much as a heat pump running on electricity), so electric mats are not suitable as whole-house heating.

Wet UFH: How It Works and What It Costs

A wet UFH system runs 15–16mm barrier pipe in loops from a manifold, circulating water at 35–45°C — substantially lower than the 60–80°C of a conventional radiator circuit. Each loop serves one zone or room; the manifold distributes flow and return across all loops, with individual actuators controlled by room thermostats via a wiring centre.

In a new build or extension, the pipe is embedded in screed: typically 65–75mm of liquid screed or sand:cement screed poured over the insulation board and pipe. Liquid screed (anhydrite or calcium sulphate) is faster to pour, self-levelling, and better at transferring heat, but costs more — £15–£25/m² for the screed itself, usually subcontracted. The UFH pipe work and manifold installation are quoted separately.

Typical costs — wet UFH new build (supply and install, excluding screed):

• Pipe, clips, insulation board, manifold, actuators, wiring centre, labour: £50–£100/m²
• Manifold unit (Wunderfloor, Polypipe, Emmeti, Speedfit): £300–£800 per manifold depending on port count and specification
• Liquid screed (subcontracted): £15–£25/m² additional
• Full new build or extension system at 80m²: £6,500–£11,000 all-in including screed

Heat pump compatibility is a major selling point in 2026. A heat pump's coefficient of performance (COP) improves significantly as flow temperature drops: a system designed for 45°C flow will achieve a COP of 3.0–3.5 or better, versus 2.0–2.5 at 55°C. UFH is the correct load for a heat pump installation; quoting them together is increasingly standard practice.

Retrofit Wet UFH Options

Retrofit is where wet UFH gets more complex — and more profitable if you know the options. The worst-case retrofit involves breaking up the existing screed, re-insulating, relaying pipe and pouring new screed. Floor levels rise by 80–100mm; doors need trimming; skirting boards need replacing. Costs reach £80–£150/m² and the job becomes a major refurbishment. Quote it as such.

The better option for most occupied homes is a low-profile overlay system. Brands including Wunda, Nuheat, and Polypipe offer pre-routed insulation panels into which 15–16mm pipe clips directly. The total build-up is 15–18mm — enough to require door trimming and transition strips but far less disruptive than a full screed pour. A compatible engineered timber or LVT floor finish goes straight on top.

• Retrofit wet UFH (full screed break-up): £80–£150/m²
• Retrofit wet UFH (low-profile overlay): £60–£110/m²
• Between-joist installation (suspended timber floor, aluminium spreader plates): £55–£90/m²

For suspended timber floors, pipe can be clipped between joists from below with aluminium spreader plates transferring heat upward. No floor level gain; access is via floorboard removal or an underfloor void. Efficiency is slightly lower than a screed system due to the air gap, but it avoids the height penalty entirely.

Electric UFH: Cost and Use Cases

Electric heating mats run at 150–200W/m² and are laid directly in tile adhesive or beneath LVT. A programmable thermostat with a floor sensor provides temperature control; WiFi models from Heatmiser, Nest, and Honeywell T6R allow remote scheduling and boost from a phone app.

Electric mat costs (supply and install):

• Electric heating mat: £20–£50/m² materials
• Installation labour: £15–£30/m²
• WiFi thermostat (Heatmiser neoStat, Honeywell T6R): £80–£200 supply and fit
• Typical bathroom (4m²): £300–£500 for mat, adhesive, and thermostat

Two important installation notes. First, not all tile adhesives are suitable over electric mats — use a flexible adhesive rated for UFH use (check BS EN 12002 compliance). Second, if you are not a registered electrician, the thermostat first-fix and final connection require a qualified sub-trade. Make this explicit in your quote and allow for coordination time.

Electric mats are not appropriate as the primary heat source for a whole property. They are a comfort upgrade for intermittently used tiled or stone rooms. Sell them as such and manage customer expectations on running costs upfront.

Floor Compatibility Guide

The floor finish affects both system performance and what you can legally install. Always check the manufacturer's specification and record it in your commissioning documentation — maximum surface temperature is typically 27°C for engineered timber.

• Ceramic and porcelain tiles: The ideal UFH floor finish. Excellent thermal conductivity, no manufacturer restrictions on surface temperature. Works with both wet and electric systems.
• Natural stone: Similar performance to tiles. High thermal mass means slower response time but excellent steady-state output. Compatible with all UFH types.
• Engineered timber: Most products are UFH-compatible; always verify the manufacturer's specification. Maximum floor surface temperature is typically 27°C — design the system to stay within this limit. A stable moisture content is critical; engineered boards are dimensionally more stable than solid wood.
• Solid wood: Not recommended as a general rule. Solid timber moves with moisture and temperature changes, causing cupping, gapping, and squeaking. Some species and products are approved with strict conditions — but the liability risk means most heating engineers decline to warranty the floor finish.
• LVT and vinyl: Most modern luxury vinyl tile and sheet vinyl products are UFH-compatible; check the manufacturer spec for maximum temperature and minimum subfloor requirements. LVT is a popular choice over overlay systems precisely because it handles the thin build-up well.
• Carpet: Significantly reduces UFH efficiency. The system will still work, but the additional thermal resistance means higher flow temperatures are needed to achieve the same room temperature. Keep the combined tog rating (carpet plus underlay) under 1.5 tog, ideally under 1.0 for best performance.

Heat Loss Calculations and System Design

A heat loss calculation to BS EN 12831 is not optional — it is the professional standard for any properly designed heating system in the UK. Without it, you cannot demonstrate that the UFH circuit is capable of maintaining the desired room temperature at design conditions (typically −3°C external temperature in most of England; colder in Scotland).

The calculation determines the heat demand of each room in watts. You then design the UFH circuit to deliver that output: pipe spacing (typically 100–200mm centres), flow temperature, and floor area covered. A well-insulated new build will typically need 40–60W/m² of UFH output; an older, less insulated property may need 80–100W/m² or more, which may require the system to run at higher flow temperatures.

Software tools from manifold suppliers (Polypipe, Wunda, Emmeti) will generate a design specification and loop layout from the heat loss inputs. Use them — the output doubles as a professional deliverable you can include with your quote and commissioning pack. CIPHE and SNIPEF both offer training in UFH system design if you want to formalise your competence.

For heat pump-coupled systems, the heat loss calculation also informs the heat pump sizing. If you are not MCS-certified for heat pump installation, coordinate with the heat pump installer at design stage — the UFH flow temperature must match the heat pump's design parameters.

Commissioning and Pressure Testing

Commissioning is where many UFH jobs go wrong — and where your liability is greatest if it is not done correctly. The sequence for a wet UFH system:

1. Pressure test before screed. Test the pipe circuits at 6 bar (static test) for a minimum of one hour. Record the result in writing, photograph the test gauge with the date visible. Once the screed goes down, the pipe is inaccessible — this test is your only proof of installation integrity at the time of laying. Do not let screed be poured without a signed-off pressure test record.
2. Flush and fill the system. Use an appropriate inhibitor and check water quality to manufacturer specification. Hard water areas may require a softener or scale inhibitor — this is especially important for heat pump-coupled systems where water quality affects the heat pump warranty.
3. Balance manifold flow rates. Set each circuit's flow rate using the balancing valves on the manifold. Match the design flow rates from the system design calculation.
4. Commission controls and zone valves. Test each zone independently. Confirm actuators open and close, confirm thermostat calls trigger correct zone valve operation, confirm the wiring centre correctly signals the heat source.
5. Screed drying protocol. Liquid anhydrite screed requires a commissioning protocol before the floor finish is laid: heat the screed progressively from 25°C over several days, then run at maximum for 48 hours to drive off residual moisture. This is the screed contractor's responsibility but you need to coordinate timing with the rest of the programme.
6. Leave a written commissioning record with the customer: system layout diagram, test pressures, flow rates, control settings, inhibitor used, and your contact details.

Smart Controls and Zone Management

Controls are where you add value and margin without a significant increase in installation complexity. Every UFH system should have individual room thermostats as standard — this is basic comfort and efficiency. The upsell is smart control.

Smart thermostat brands for UFH: Heatmiser Neo, Nest (Google Home integration), Hive Active Heating, Honeywell T6R. All support remote access, scheduling, and boost from a smartphone. Heatmiser Neo has the most comprehensive UFH-specific feature set, including floor sensor input and per-room scheduling. Nest and Hive are the most recognisable to homeowners and often the easiest to sell.

Weather compensation adjusts the flow temperature based on outdoor temperature — reducing it on mild days and increasing it on cold days. It is standard on heat pump systems (often mandated by Building Regulations Part L) and improves efficiency on boiler-powered UFH too. Most manifold controller units and modern boilers support weather compensation input; quote it as a feature, not an afterthought.

For high-end projects, integration with Loxone or KNX smart home systems allows UFH controls to be part of a wider home automation setup. This is a specialist area but worth knowing if your customer base includes developers or higher-value residential work.

Selling UFH as a Premium Upgrade

UFH is increasingly a standard specification on new build extensions — not a luxury. Customers who are already spending £40,000–£80,000 on an extension are receptive to a £4,000–£8,000 UFH upgrade, especially when you can explain the heat pump compatibility and running cost benefits. The margin on UFH typically exceeds the margin on radiators once you account for the higher invoice value.

The most effective sales approach is to raise UFH at the first site visit, not as an afterthought at quote stage. Ask about the heat source plan: if the customer is considering a heat pump, UFH becomes a natural requirement. If they are retaining a gas boiler, wet UFH still provides better room comfort and lower running costs than radiators at the same flow temperature.

Warranties matter to customers on a £6,000+ system. Most manifold and pipe systems carry 25-year pipe warranties (Wunda, Polypipe, Emmeti). Quote your installation workmanship warranty separately — typically one to two years on labour. Professional training through SNIPEF or CIPHE provides a credibility signal when competing for higher-value extension work.

Track which marketing channels bring in UFH and extension enquiries. If you are spending on Google Ads, Checkatrade, or direct mail, understanding which source generates your highest-value jobs tells you where to concentrate your budget. Most heating engineers do not track this at job level — those who do consistently invest in the channels that pay.