Three more protected trees have been removed to make way for the of the Sarjeant Gallery extension.
Five oaks and four phoenix palms, all protected, were felled for the gallery redevelopment project in January.
"We never want to remove trees if we can possibly help it," project director Gaye Batty said.
"This was sadly our only option.
"It was originally anticipated that our contractor could manoeuvre site vehicles around the trees, with mitigation measures in place to protect tree roots."