How to Price Wet Underfloor Heating: UK Cost Guide 2024

Quick Answer: Wet underfloor heating prices at £85-£150/m² installed for a single-zone system on new screed, £110-£190/m² for retrofit over existing floor with insulation, and £140-£240/m² for premium multi-zone with smart controls. A typical 25m² kitchen-diner installation runs £2,400-£4,500 total. Wet UFH must comply with Building Regulations Part L1B (insulation), Part E (sound) where applicable, and BS EN 1264 for system design.

Summary

Wet underfloor heating is the modern default for kitchen, bathroom, hallway and open-plan living areas in mid- and high-spec UK home renovations. It pairs naturally with heat pumps (which prefer lower flow temperatures) and with tiled/stone finishes (which transmit heat well). The pricing logic differs from radiators because the labour is more intensive, the screed timing dominates the programme, and the underlying insulation specification has a large effect on running cost.

The three core decisions that drive 80% of the price: pipe layout method (clips into insulation, staples, dry-fix panels, or routed into structural slab), screed type (traditional sand-cement, liquid anhydrite calcium sulfate, dry overlay), and zone count. Each choice has knock-on effects of £15-£60/m² on the total.

This guide covers wet UFH installation in new-build and retrofit scenarios. For electric (dry) underfloor heating see equivalent guidance in full bathroom installation pricing guide and full kitchen fit pricing guide. For heat-pump-paired UFH design considerations see air source heat pump pricing guide.

Key Facts

• Pipe — PEX-A or PEX-AL-PEX 16mm × 2mm — £1.20-£2.20/m supplied
• Pipe — PE-RT 16mm × 2mm — £0.90-£1.60/m supplied
• Typical pipe length per m² — 5-7 m of pipe per m² of floor at 150mm spacing
• Manifold (4-port) — £180-£300 supplied
• Manifold (6-port) — £240-£400 supplied
• Manifold (8-12 port) — £350-£650 supplied
• Manifold pack (manifold + flow meters + isolation + drain) — £280-£800 depending on size
• Pump kit / mixing valve — £150-£300 (when not pumped via boiler)
• Actuators — £25-£45 each (one per circuit)
• Wiring centre — £60-£140 supplied
• Smart thermostat per zone (Heatmiser, Drayton) — £70-£180 supplied
• Insulation board (EPS or PIR) under UFH — £8-£25/m² supplied
• Edge expansion strip — £1-£2/linear m
• Reflective foil layer — £3-£6/m²
• Floor clips or staple system — £4-£8/m²
• Liquid screed (anhydrite calcium sulfate, e.g. Gyvlon) — £18-£32/m² supplied + £8-£12/m² to lay
• Sand-cement screed (75mm) — £12-£22/m² supplied + £15-£25/m² to lay
• Dry overlay panels (Nu-Heat LoPro, Polypipe Overlay) — £45-£75/m² supplied (eliminates screed)
• Plumber day rate — £240-£360 regional, £300-£440 London
• Screeder day rate — £200-£300 regional, £260-£380 London
• Insulation installer / labourer — £160-£260/day
• Productivity — 25-40m² of UFH pipe laid per plumber-day; liquid screed 100-200m² per day; sand-cement 25-40m² per day
• Drying time — liquid screed walkable in 24-48 hours, fully cured 21-28 days; sand-cement walkable 3-4 days, fully cured 28+ days
• Drying acceleration — Calcium Chloride Test or RH probe to confirm dry before tiling; never tile or floor over wet screed
• First commissioning warm-up — slow ramp up, 5°C/day to avoid screed cracking; full warm-up takes 2-3 weeks
• Building Regulations — Part L1B insulation requirement (U-value 0.13-0.22 W/m²K typical for ground floor); Part E sound (multi-occupancy)
• BS EN 1264 — Floor heating systems and components — design and installation
• BS 8000-9:2003 — Workmanship on construction sites — cement/sand screeds
• VAT — 20% standard

Quick Reference Table

Detailed Guidance

Pipe Layout Methods

Choice of pipe layout method drives 30-40% of the labour cost:

Clip rail or staple onto EPS insulation board (most common, new build)

• Insulation board with pre-printed grid; pipe clips push into board
• Productivity: 40-60m²/plumber-day
• Cost: clips £4-£8/m² + insulation £15-£25/m²

Staple to insulation with pneumatic staple gun

• Faster for large areas; staples through reflective foil into insulation
• Productivity: 50-80m²/plumber-day
• Cost: staples £2-£4/m² + insulation £15-£25/m²

Pre-routed panels (Nu-Heat LoPro, Polypipe Overlay)

• Foam or chipboard panel with grooves cut to receive pipe
• Productivity: 30-50m²/plumber-day
• Cost: £45-£75/m² supplied (eliminates separate insulation cost)
• Best for retrofit where build-up height is limited

Aluminium spreader plates between joists

• For suspended timber floors without insulation board below
• Productivity: 20-35m²/plumber-day
• Cost: spreader plates £8-£15/m² + insulation between joists

Pipe in screed (encapsulated)

• Traditional method for thicker sand-cement screeds
• Productivity: 30-50m²/plumber-day
• Cost: clips £4-£8/m²

Screed Type Comparison

Liquid screed (anhydrite/calcium sulfate) — Gyvlon, Cemfloor, Lytag

Pros:

• Self-levelling, no trowelling
• Faster install (100-200m²/day for screeder gang)
• Thinner installation (50-65mm typical)
• Better thermal conductivity to UFH pipes
• Crack-resistant; high tensile strength

Cons:

• Requires DPM and detail expertise
• Walking on uncured screed within 24-48h damages it
• Cannot tile until properly cured (RH <75%)
• Cannot use with cement-based flooring/tile adhesives unless primed
• Disposal of mix water is regulated (alkaline)

Cost: £18-£32/m² supplied + £8-£12/m² lay = £26-£44/m² installed

Sand-cement screed (75mm)

Pros:

• Cheaper
• More familiar to most builders
• Compatible with cement tile adhesives
• More forgiving of detail variations

Cons:

• 75mm minimum thickness (vs 50mm liquid)
• 28+ day cure (vs 21 day liquid)
• Slow install (25-40m²/day)
• Higher mass — longer warm-up

Cost: £12-£22/m² supplied + £15-£25/m² lay = £27-£47/m² installed

Dry overlay panels (no screed)

Pros:

• Eliminates screed entirely
• Minimal build-up height (25-35mm)
• Fast install (panels are pre-routed; plumber assembles)
• No drying time

Cons:

• Higher upfront panel cost
• Slower thermal response (less mass to drive warmth)
• Limited to manufacturer's panel system

Cost: £45-£75/m² for the panel-pipe-insulation system

The Manifold and Controls

Each UFH manifold serves a zone group (kitchen, hallway, bedroom). Components:

• Manifold body — brass or stainless steel; ports = number of pipe circuits (typically 1 circuit per 80-100m²)
• Flow meters per port — set per circuit at commissioning
• Isolation valves for service
• Drain and air bleed
• Mixing valve (where blending boiler-temperature flow with cooler return for UFH temperature)
• Pump (often integrated into mixing valve unit)
• Wiring centre — receives thermostat calls, controls actuators and pump

Manifold typically placed in a cupboard or service void; needs access for service and maintenance. Plumb-in cost £180-£500 depending on size.

Smart Control Strategy

Modern UFH installs use one of:

• Single thermostat per zone — simple, reliable, modest cost
• Smart thermostat (Heatmiser Neo, Drayton Wiser) — wireless to wiring centre; app control
• Multi-zone smart with TRVs and zoning — premium; full app control of each room

For a typical 60m² UFH install with 4 zones, smart control adds £300-£700 over basic thermostats.

Insulation — The Hidden Energy Win

Building Regulations Part L1B requires ground floor U-value 0.13-0.22 W/m²K. With UFH this matters more — without proper insulation, half the heat goes down rather than up.

Typical insulation depths:

• 75-100mm EPS or PIR board for new build (ground floor)
• 25-50mm thin PIR or vacuum insulation panels for retrofit (where build-up is limited)

Specification:

Floor Finish Compatibility

UFH suits:

• Tile or stone — best heat transfer; standard choice
• Engineered timber — acceptable with <22mm thickness, certified for UFH
• LVT / vinyl — generally acceptable; check temperature limit (usually 27-28°C max surface)
• Carpet — limits effective output; specify low tog rating (<2.0)
• Solid timber — generally not recommended; movement risk

Specify floor finish at the design stage; UFH circuits are sized for the planned finish.

Pricing Walkthrough — 28m² Kitchen-Diner New Build, Liquid Screed, Regional

Where Builders Lose Money

• Forgetting drying time — tiling over uncured screed = lifted tiles
• Wrong insulation spec — Part L1B compliance failure
• Pipe clamping inadequate — pipes float during pour
• Mixing valve omitted — boiler-temp flow damages screed and pipes
• Commissioning skipped — slow warm-up critical to avoid screed cracking
• Customer using floor as workspace during cure — needs explicit no-entry for 7-14 days minimum

Frequently Asked Questions

Can I install wet UFH on a suspended timber floor?

Yes, with either spreader plates between joists (lower output, lower cost) or with overlay panels (e.g. Nu-Heat LoPro, Polypipe Overlay) above the existing floor (~25-35mm additional build-up). Output is lower than screed-based UFH but still effective for primary heating in well-insulated rooms.

How long does UFH take to install?

Pipe laying takes 1-3 days for typical room sizes. Liquid screed pour is half a day; drying 21-28 days. Total programme: 4-6 weeks from start of UFH to walkable, fully usable floor. Tile installation must wait until screed is dry (RH probe <75%) — typically 28 days for cement screeds, 21 days for liquid.

Is wet UFH worth it vs radiators?

For new builds and major renovations: yes — comfort and aesthetic justify the cost. For minor renovations: only in specific rooms (kitchen, bathroom) where the floor finish is suitable. For heat pump installations: strongly recommended — UFH's lower flow temperature improves heat pump efficiency by 15-25%.

Can wet UFH be used with a gas boiler?

Yes — with a mixing valve between boiler flow (typically 65-75°C) and UFH (typically 35-50°C). Most domestic UFH is gas-boiler-fed with a mixing valve at the manifold. Heat pump pairs naturally because heat pump output is already 35-50°C without mixing.

How much does UFH cost to run?

Running cost is similar or slightly less than radiators for the same heat output, because UFH operates at lower flow temperatures and the room can be set 1-2°C lower at the thermostat (radiant heat feels warmer). Energy saving over radiators typically 5-15%. Heat pump + UFH combination is the most efficient domestic heating setup.

Regulations & Standards

• Building Regulations 2010 — Part L1B (Conservation of fuel and power, ground floor U-value), Part E (Sound), Part B (Fire), Part J (Combustion appliances where boiler-fed)

• BS EN 1264-1/-2/-3/-4 — Water based surface embedded heating and cooling systems

• BS 8000-9:2003 — Workmanship on construction sites — cement/sand screeds

• BS EN 13813 — Screed material and floor screeds — properties and requirements

• BS 6700 — Specification for design, installation, testing and maintenance of services supplying water for domestic use

• WRAS — Water Regulations Advisory Scheme; UFH manifold compliance

• CIBSE Guide B1 — Heating, ventilation and cooling

• Boiler Plus 2018 — Smart controls or compensation requirements

• Approved Document L1B

• BSI — BS EN 1264 — UFH design standard

• Heatmiser — UFH control technical guidance

• Nu-Heat — UFH manufacturer technical library

• Polypipe — UFH technical — pipe and overlay system specifications

• Heat Geek — independent heat-pump and UFH guidance

• BSCMA — British Cement Mortar Association — screed guidance

• central heating installation pricing guide — wider central heating context

• full kitchen fit pricing guide — kitchen install incorporating UFH

• full bathroom installation pricing guide — bathroom UFH

• air source heat pump pricing guide — heat pump pairing

• single storey extension pricing guide — extension build including UFH

• resin flooring guide — floor finish over UFH