Grade I buildings are of exceptional interest, sometimes considered to be internationally important; only 2.5% of listed buildings are Grade I. www.english-heritage.org.uk

Grade II buildings are nationally important and of special interest; 92% of all listed buildings are in this class and it is the most likely grade of listing for a home owner. www.english-heritage.org.uk

Grade II* buildings are particularly important buildings of more than special interest; 5.5% of listed buildings are Grade II*. www.english-heritage.org.uk