The new Building Regulations require that after any alteration to a minimum of 25% of your home’s surface area, your home either achieves a minimum B2 BER rating or your heating system and attic insulation comply with the Building Regulation standards.
If you are applying for an SEAI grant for External or Internal Wall Insulation you will be required to comply with these new Building Regulations as a condition of your grant payment.
In SHORT you need 300mm attic insulation and an oil boiler of less than 15yrs old.