A court battle has blown out the cost of an upgrade to Sandgate Aquatic Centre’s pool by more than $1 million, with Brisbane City council to help foot the bill.

Though council approved the development in September of 2014, the upgrade was put on hold when it was challenged in the Planning and Environment Court and the Supreme Court.

The five-year delay in the commencement of construction has prompted a cost increase of $1 million for the work to be completed in the jointly-funded $4 million upgrade to the pool.