Maintenance work on Byw'n Iach Plas Silyn car park in Penygroes could last four months.
Work is due to start on 7 May. There will be limited spaces to park so people are asked to share lifts or walk to the centre where possible.
“We also ask that customers take care around the work vehicles,” a spokesperson said.
“Apologies for any inconvenience this may cause but we hope that the work will make your experience more enjoyable in the future.”