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Install conservatory underfloor heating.
Wet UFH under tile or warm-roof conservatory — usable in winter without heating the rest of the house.
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Costs, timelines, pitfalls and the right questions to ask before any conservatories starts on conservatory Underfloor Heating.
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Top tips
Hiring a conservatories, without the regret.
Four moves that separate a smooth job from a nightmare.
Existing boiler undersized
Adding a conservatory load to a marginal existing boiler can cause heating problems elsewhere. Boiler upsizing may be needed.
Floor finish wrong
UFH doesn't work well under thick carpet. Tile, LVT or engineered wood ≤20mm thick are ideal.
No insulation under slab
UFH heats the floor downward and outward as well as upward. 100mm PIR under the slab is essential.
Single-thermostat oversimplification
Large conservatories need 2–3 thermostat zones for comfort. Cheap installs use one.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and a typical week-by-week schedule.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Wet UFH small conservatory (10–15 m²)Pipes + manifold
£800–£1.8k
Wet UFH medium (15–25 m²)More pipe runs
£1.2k–£2.5k
Wet UFH large (25 m²+)Multi-loop manifold
£1.8k–£4k
Electric UFH per m² (cheaper supply)Mat + thermostat
£40–£80/m²
Boiler tie-inIf existing boiler suitable
£200–£800
New boiler if upsize neededIf existing boiler undersized
£1.8k–£4.5k
!
Quote spread is typically ± 18% — always get 3 quotes.
Timeline
Mid-size conservatory · week by week
Typical
5 phases · 5 wk
5 phases · 5 wk
W1
W2
W3
W4
W5
Foundations + dwarf wall
Frame + glazing
Roof + ridge
Electrics + flooring
Snags + handover
!
Schedule slips on dependencies — pad each phase by 10–20% for real-world delays.
At a glance
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Conservatories explained
Underfloor heating (UFH) is the most efficient way to heat a conservatory — large surface, even warmth, no radiators eating wall space. Expect to pay £1,200–£3,500 for a UK conservatory UFH installation depending on system type, size and existing boiler integration.
What Does the Work Involve?
Wet UFH (most common): PEX pipes are laid in the screed of the conservatory floor — at slab pour time for new builds, or in a 50mm screed overlay for retrofits. Manifold connects pipes to the boiler via a flow-and-return circuit, with a thermostat-controlled mixing valve. Electric UFH: thin heating mat laid under the floor tiles or LVT. Both need a thermostat and time controller.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Wet UFH small conservatory (10–15 m²) | 800 | 1,800 | Pipes + manifold |
| Wet UFH medium (15–25 m²) | 1,200 | 2,500 | More pipe runs |
| Wet UFH large (25 m²+) | 1,800 | 4,000 | Multi-loop manifold |
| Electric UFH per m² (cheaper supply) | 40 | 80 | Mat + thermostat |
| Boiler tie-in | 200 | 800 | If existing boiler suitable |
| New boiler if upsize needed | 1,800 | 4,500 | If existing boiler undersized |
| Smart controls (Nest, Hive) | 180 | 500 | Per zone |
How Long Does It Take?
Wet UFH at slab pour time: 1 day to install pipes, included in slab pour. Retrofit wet UFH: 2–3 days. Electric UFH: half a day for a small conservatory.
DIY or Professional?
Wet UFH must be installed by a plumber/heating engineer — boiler integration is gas-safe regulated. Electric UFH mat install is DIY-able but the thermostat wiring needs an electrician for Part P certification.
Choosing the Right Tradesperson
Wet UFH: plumber or heating engineer (Gas Safe registered). Electric UFH: electrician (Part P registered). Combined: a heating specialist often does both. Brands: Polypipe, JG Speedfit, Robbens for wet; Warmup, ProWarm for electric.
UK Regulations
Wet UFH falls under Part L (thermal efficiency) and Gas Safe (boiler work). Electric UFH falls under Part P (electrical). New conservatory installations integrate with the wider Part L compliance for the whole conservatory.
Common Problems
- Existing boiler undersized: Adding a conservatory load to a marginal existing boiler can cause heating problems elsewhere. Boiler upsizing may be needed.
- Floor finish wrong: UFH doesn't work well under thick carpet. Tile, LVT or engineered wood ≤20mm thick are ideal.
- No insulation under slab: UFH heats the floor downward and outward as well as upward. 100mm PIR under the slab is essential.
- Single-thermostat oversimplification: Large conservatories need 2–3 thermostat zones for comfort. Cheap installs use one.
Frequently Asked Questions
Wet or electric UFH for a conservatory?
Wet for new builds and floor-up retrofits — cheaper to run long-term, integrates with existing boiler. Electric for retrofit-only installs where digging up the slab isn't practical.
How long does UFH take to warm up?
Wet UFH: 1–3 hours to warm a cold conservatory. Electric: faster (30–60 minutes). Both work better with smart timer than on-demand.
Will UFH replace radiators?
Yes — most conservatories with UFH have no radiators. Saves wall space and gives even warmth.
Can I run UFH off my existing boiler?
Usually yes — modern combi boilers (24kW+) can take the additional load. Older or smaller boilers may need upsizing. A heating engineer will calculate.
What floor finish works best with UFH?
Porcelain tile, LVT, or engineered wood. Avoid thick carpet (insulates the heat down). Avoid solid timber over 20mm (slows response time).
Is UFH expensive to run?
Comparable to radiators per m² heated. Saving comes from even comfort meaning the thermostat can be set 1–2°C lower than with radiators.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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