On average, your home will lose up to 35% of heat through its outer walls. If you have an older house with poor outer wall insulation, or no insulation at all, that heat loss will cost you a significant amount of money each year.
Unfortunately, inadequate or absent wall insulation can be expensive to remedy, but there are grants available through the SEAI for all BER improvements, including substantial rebates for outer and inner wall insulation.
Cracks or gaps in the outer walls can introduce a draught into your home, or allow moisture to rot cavity wall insulation. Catching cracks or gaps early is a cheap and easy fix that will pay dividends.