RetroFit Underfloor Heating – Over lay or excavate?

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One of the most frequent questions we get asked from customers wishing to retro-fit underfloor heating (UFH) is what is best/most cost effective, excavate the existing floor or add a board system?

Whilst costs can vary hugely by area, tradesman etc., we've compiled a list of comparative costs for each type of UFH install and labour etc. on a typical approx. 75m2 project:

Excavating the floor

Item

Description

£+vat

Building work

Excavate existing concrete floor to 150mm

1000

Disposal

Skips for rubble

450

Insulation

75m2 @ 100mm PIR insulation + DPM

800

DPM

1200 gauge damp proof membrane

100

UFH Kit

UFH kit inc. 3 thermostats & controls

850

UFH Install

Installation of UFH kit

650

Screed

65mm sand/cement screed

1150

Total

 

5000

Pros
Insulation to modern building regulations, UFH in thick screed – the best for heat output.

Cons
Time duration of work, upheaval, building site conditions, higher expense and noise.

RENOV18 board system

Item

Description

£+vat

UFH kit

RENOV18 Retro Fit UFH system inc. controls

2600

Insulation

Airtec foil

180

UFH Install

Installation of UFH kit

1200

Self Levelling

75m2 @ 3mm self levelling compound/install

500

Total

 

4480

Pros
Cheaper than excavation, faster installation and less upheaval

Cons
Less insulation in the floor construction, slightly less heat output

Conclusion

Whilst we've done our very best to show all of the variables, each customer must decide for themselves which is the best method. Can you cope with the upheaval? Do you want to spend the extra for a well insulated floor?

In both cases the UFH will be sufficient to heat the room(s).

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