Does a domestic oil storage tank require secondary containment (bunding)?

Building Regulations for England and Wales requires all domestic oil storage tanks exceeding 2500 litres capacity to be provided with secondary containment (bunding). The bunding of oil tanks not exceeding 2500 litres capacity is dictated by the outcome of an individual site pollution risk assessment. Only when there is no risk of oil reaching for example, a watercourse, water extraction point or aquifer following a release of oil from the tank may a single skin tank be considered. We will be able to perform a fire and pollution risk assessment and advise on the type of tank most suitable for an installation.