Anyone who sees an older house divided into possibly rental accommodation with 9 bathrooms up for sale knows that a big renovation job is a given.🙄
Regulations for building work have dramatically increased and so have resulting costs.
I live in an old urban area and every house, often probate sales, automatically are presumed to involve a big job to bring it up to modern specs.
There is a huge housing crisis in ireland as there are in many countries, and the OP very likely didn't have a huge selection of houses to choose from in her chosen area.
Google the population of ireland and educate yourself.....it's approximately 5 million, a fraction of the UK.
Prices from what I am reading prices have increased 50%+ in 5 years.
The OPs neighbours have done this, yet are cheeky enough now to think they get to dictate to her.
OP is obliged to follow local building work time restrictions and nothing else.
Neighbours this entitled will no doubt be a nightmare no matter what happens.