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Garden flats needing refurbishment.
150 square metres and above.

Refurbishment is a great opportunity to replace the old gas boiler with an electric alternative. Depending on the condition of the heating system and your budget, you have two options:

Option 1

Heat pumps are perfect for large properties, and especially in the case of extensive refurbishment,  Heat pumps work better in buildings with a reasonable level of insulation (not high). Therefore, the older the house, the more investment is required to bring them to the right level.  On average, they will require more investment than other heat engines, but the opportunity of a refurbishment usually makes them worthwhile.

Approximate costs: £8,000 -10,000, including units, cylinder and installation and government incentives (currently £5000)

Option 2 

For very light refurbishments of well-insulated houses, Infrared heati
ng combined with a smart immersion tank is the second option. If installing infrared heting panels, the cost will probably be comparable to a heat pump (Option 1), but the energy efficiency will be worse.

If installing infrared thin film, the cost will be higher (hence only valid for very light refurbishments).

Approximate cost: £9-10,000 for infrared panels

£16-22,000 with plastered-in thin film infrared

What else can you do?
The power required to heat the house ultimately depends on how well-insulated the building is and how efficient the heating system. It makes sense to address the building fabric and the heat engine simultaneously: improving the fabric reduces energy requirements, and the cheapest energy is the one you don’t use. 

Fabric first: Old buildings (pre-war) have no cavity walls. Insulating walls from the inside can be tricky and expensive. Our advice is to advocate fabric improvements at the scale of the building to improve walls from the outside (where possible) and the roof. Instead, you can replace the windows and doors and improve air tightness by checking and insulating all the penetrations (pipes and ducts going out). 

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