Homeowners hoping to switch to a lower mortgage rate, are being urged to start the process sooner rather than later.
Banks are taking up to four weeks to get through applications, as thousands hope to secure a lower repayment rate before interest rates increase further.
In recent weeks, the European Central Bank announced a 0.75% increase in interest rates, which follows a 0.5% rise over the summer.
The initial increase over the summer was not passed onto consumers.
The delay is in breach of the Central Bank's Consumer Code and is leaving borrowers at risk of missing out on lower interest rates currently on offer.
But Managing Director of doddl.ie, Martina Hennessy, says some banks can be flexible with mortgage switchers:
"The rate you get is always at the day you drawdown your mortgage. So if rates increase in the intervening period you may be charged at the higher rate.
"Over the last couple of months with lenders increasing their rates they've given concessions and allowed a number of weeks for applicants to close out their mortgage to avail of the previous rate."
