Seaford Town Council is advertising for new members after five councillors resigned within a 24 hour period.
The five councillors – who make up a quarter of the 20 member council chamber – all say they are stepping down for personal reasons.
They are: Marion Lambert, Rob Chambers, Debbie Silvey-Adam, Isabelle Murray and Carol Campbell who was the town’s deputy mayor.
Public notice of the resignations was given on Tuesday August 16.
A spokesman for the council said: “One factor in common for all Councillors resignations, except for Councillors Campbell, is the realisation that being a voluntary Town Councillor is a very demanding commitment that cannot be entered into lightly.
“Whilst all five Councillors had their own personal reasons for resigning the time demands of being a town councillor was a factor in the resignations of four of the Councillors.”
The council is advertising the vacancies on its website following the mass resignation.
There will be a by-election if ten or more electors in each ward request one.
Cllr Carol Campbell has resigned for health reasons following a recent illness.
She had been a member since May 2015 and was both the deputy mayor and chair of community services and had been a councillor since May 2015.
Cllr Lambert, a former mayor, has been a very active member of the town’s planning committee since being re-elected in May 2015 following a eight year absence. The council say she is stepping down after a recent bout of ill health, which has significantly restricted her ability to serve as a councillor.
Cllr Rob Chambers has resigned to begin a teacher training course. He was vice chair of the view and golf committee and had also been a councillor since May 2015.
Cllr Isabelle Murray has resigned to take a gap year from her full time studies, which will include travelling abroad for long periods of time.
She was elected in a by-election in July 2015 and at the time was the youngest councillor in the country, aged 18 years and 43 days.
Cllr Debbie Silvey-Adam says she has struggled to fully participate in the council activities since her election in May 2015. She says she has found it difficult to participate due to illness and family time demands.
A council spokesman said: “The five vacancies are currently being advertised, anyone who is interested is urged to take into account that the average number of hours required to be a town councillor is in excess of 12 hours per week and that the roles are unpaid.”
Details of the role of councillor and how to request a by-election are available online at www.seafordtowncouncil.gov.uk.