Driveways usually sink because they haven’t been laid properly. They may not have been dug deep enough, or the installer might not have used the right materials. This will need to be corrected at the earliest opportunity, although in extreme cases, the driveway may need to be completly be relaid.
Carrickfergus
Carrickfergus, identified locally and colloquially as "Carrick", is regarded as a huge town in County Antrim, Northern Ireland. It's upon the northern coast of Belfast Lough, 11 miles (18 km) from Belfast. The town possessed a population of 27,201 on the 2001 Census and got its identity from Fergus Mór maEirc, the 6th century king of Dál Riata. It's County Antrim's oldest town and one of the older settlements in Northern Ireland in general. Carrickfergus is the admin centre for Carrickfergus Borough Council and forms part of the Belfast Metropolitan Area.