Underfloor Heating in London: Complete Installation Guide & Costs

Underfloor heating has become increasingly popular in London homes, offering efficient, even heat distribution without visible radiators. Here's everything you need to know about installing underfloor heating.

Types of Underfloor Heating

Wet (Water-Based) Systems

Water heated by your boiler circulates through pipes beneath the floor.

Pros:

• Lower running costs than electric
• Works with heat pumps for maximum efficiency
• Heats larger areas effectively
• Can be zoned for different temperatures

Cons:

• Higher installation cost
• Best suited for new builds or major renovations
• Requires more floor build-up
• Longer heat-up time

Electric (Dry) Systems

Electric heating mats or cables installed under flooring.

Pros:

• Lower installation cost
• Easier to retrofit
• Minimal floor height increase
• Heats up quickly
• Individual room installation possible

Cons:

• Higher running costs
• Better for smaller areas
• Not ideal as main heating source

Is Underfloor Heating Right for Your Home?

Underfloor heating works well if:

• You're building a new home or extension
• You're doing a major renovation with new floors
• You want to maximise space (no radiators)
• You have good insulation
• You prefer consistent, even heat

Consider alternatives if:

• You're on a tight budget
• You only need heating in one small room
• Your home has poor insulation
• You need quick heat-up times
• You're in a rental property

Floor Coverings for Underfloor Heating

Best options:

• Stone and ceramic tiles (excellent heat conductivity)
• Engineered wood (designed for UFH)
• Vinyl and LVT flooring
• Polished concrete

Less suitable:

• Thick carpet (insulates against heat)
• Solid wood (can warp with temperature changes)
• Cork (poor heat transfer)

Underfloor Heating Installation Costs in London

Wet Systems

• Supply and installation: £50-£75 per square metre
• Manifold and controls: £500-£1,000
• Screed: £25-£35 per square metre
• Total for average room (20m²): £2,000-£3,500

Electric Systems

• Heating mat supply: £30-£50 per square metre
• Installation: £200-£400 per room
• Thermostat: £50-£200
• Total for average room (20m²): £800-£1,500

Running Costs Comparison

For a typical 3-bedroom London home:

Costs depend on insulation, usage patterns, and energy tariffs.

Installation Process

Wet System Installation

1. Design and planning: Engineer surveys property and designs system
2. Preparation: Floor levelled, insulation boards installed
3. Pipe installation: Pipes laid in serpentine or spiral pattern
4. Manifold connection: Pipes connected to central manifold
5. Pressure testing: System tested for leaks
6. Screed application: Liquid or sand/cement screed poured
7. Curing period: 3-4 weeks before flooring
8. Floor covering: Final flooring installed
9. Commissioning: System tested and balanced

Electric System Installation

1. Survey and design: Room measured, mat layout planned
2. Floor preparation: Substrate cleaned and levelled
3. Insulation: Thermal boards laid if required
4. Heating mat installation: Mats positioned and secured
5. Electrical connection: Connected to thermostat and mains
6. Testing: System tested before covering
7. Floor covering: Tiles or other flooring installed
8. Commissioning: Thermostat programmed

Maintaining Underfloor Heating

Underfloor heating requires minimal maintenance:

• Wet systems: Annual boiler service, occasional inhibitor check
• Electric systems: No regular maintenance needed
• Both: Thermostat battery replacement, periodic checks

Retrofitting Underfloor Heating

Retrofitting is possible but consider:

• Floor height increase (15-50mm)
• Door clearance issues
• Existing floor removal costs
• Subfloor condition
• Impact on room transitions

Electric systems are easier to retrofit with minimal disruption.

Contact Aza & Sons for Underfloor Heating

Considering underfloor heating for your London home? Call Aza & Sons on 07955014805 for a survey and quote. Our heating engineers install both wet and electric systems across London and the South East.