In the Republic for much of our history, there were no national regulations on house numbering or street naming, just a single guidance document issued in 1971. This lead to local authorities and developers developing their own practices. At one stage there were 47 local authorities in the state; County Councils, Corporations, and Town Councils. There was also a practice of providing social housing through making available a site to a qualified person to have a house built on it. These sites had reference numbers that frequently ended up on the house because there were processes that started with allocation and ended with a completed house (e.g. land transfer, building contracts, utility connection etc.). Each local authority had its own way of referencing and numbering such sites - by street, by electoral division, by civil parish etc. Sometimes these processes occurred at a different pace for different individuals effecting the sequence on numbers. It’s the way things were done at the time.