The problem is a few years ago it was publicized in the news that there was a shortage of plumbers & pipe fitters. There are now lots of young people training & enter pluming which means that there are less jobs available.
If you want a job the only way you will get work is though an agency on contract. It�s a sad fact that once people get near 60 employers won�t take them on as permanent staff. Working contract will mean more flexible hours and better pay.
Sorry, I work in construction but don�t know of any domestic agency�s, hope the above helps.