Cost of zero carbon house in comparison to social housing
The cost of building zero carbon house as a whole can be compared to the cost of social housing. The cost per square foot of building:
- an average housing association home in 2009 was around £120
- zero carbon house, including the cost of the new construction and retrofit, was around £150
However, figures collated in 2014, show the cost of building zero carbon homes has fallen. The added cost for building a new home to zero carbon standards is estimated to be around £5,000.
Savings from renewables
In a case study in his book Designing Zero Carbon Buildings Using Dynamic Simulation Methods, Professor Ljubomir Jankovic focusses on costs of the retrofit part of the house. He calculates the cost of upgrading the original house to zero carbon standards will be paid for by the income from electricity generation and the savings in fuel bills within 8.6 years.
Cost of new walls in comparison to retrofit walls
- New build (insulated render over clay blockwork finished internally with wet lime plaster) cost £165.50/sqm of wall.
- Retrofit (plasterboard and Intello airtight membrane on timber frame dry lining, filled with Warmcel insulation and breather membrane, all fitted inside the existing nine inch brickwork front wall of the old house) cost £78.82/sqm of wall.
Improving insulation on a budget
Even without much money it’s possible to make worthwhile savings. Sealing all gaps to the outside in walls, ceilings, floors, windows, doors, electrical sockets and skirting boards can make a big difference.
- For more detailed help go to Birmingham Energy Savers.
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