House owners planning to undertake major renovations or extensions will be required to ensure that the whole dwelling will meet the higher energy rating (BER) of B2 upon completion under new building regulations.
The new rules will come into effect from November 2019, and will also require all new homes to become nearly zero energy buildings (NZEB). That will require them to have a BER of A2, - twice as energy efficient as the current minimum required rating for new builds of A3.
Where more that 25 per cent of the surface of the building is undergoing renovation or an extension there will be a requirement that the whole building should achieve an energy efficiency of B2 or cost optimal level.
On November 1, amendments to Part L and Part F of the building regulations (relating to energy efficiency and ventilations) for new residential dwellings and dwellings getting major renovations come into effect. The Government said the rules will be subject to transition arrangements to allow flexibility to developers.
Requirements for major renovation of domestic buildings
For existing buildings, it is proposed that major renovation is typically activated under the following circumstances, where the work affects greater than 25% surface area of the existing dwelling:
External Wall Renovation, external or internal insulation
External Wall & Window Renovation
External Wall & Roof Renovation
External Wall & Floor Renovation
The cost optimal level is a primary energy performance of less than 125 kWh/m2/yr (B2 BER) when calculated using DEAP or upgrade of roof insulation and heating system. The Cost Optimal Study was updated in 2018.
Painting, replastering, rendering, reslating, cavity wall insulation are not considered major renovation works.
Energy upgrade works to the house pictured above included:
Super levels of insulation to floors, walls and roof
Triple glazed windows and rooflights
Airtightness membranes and tapes throughout
Link: Irish Times article
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