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A housing development is defined as being unadopted when the roads or sewers are not maintained by the government, this often happens when they fail to meet a certain standard.

BBC News NI previously reported that homes surrounded by unadopted roads and sewers are difficult to sell, and ground maintenance problems can go unresolved for years.

Figures seen by BBC News NI show that there are more than 1,800 unadopted housing developments across Northern Ireland, with the largest percentage in Mid Ulster.

Solicitors will often advise a client not to proceed with the purchase of a house in an unadopted development, and banks can be reluctant to mortgage the house.

But in some cases of unadopted developments, the value of the bond is not enough to cover the cost of extensive repair works needed to bring it to an adoptable standard.