Troy Planning + Design, which has UK offices in London and Hampshire, said it has been commissioned by the council to "consider the art of the possible" at the candidate development sites across the coastal Essex borough, most of which are local authority-owned.
The practice said in a statement: “Our work is feeding into a strategic assessment of opportunities across the borough and some of the sites may be selected to be brought forward for development, contributing to local housing needs and the wider place-making agenda."
The sites "represent a mix of locations and opportunities, including mixed-use town centre sites, seafront regeneration opportunities, the regeneration and redevelopment of residential tower blocks, and smaller sites in established residential areas".
It added that it is “also providing the council with a critical-friend role” on its emerging urban capacity study, and preparing design case studies “to illustrate the potential for growth and intensification”.
Southend Council has been approached for a comment.
Troy also announced that it has been appointed to help Redbourn Parish Council in Hertfordshire prepare a neighbourhood plan.
“Located within St Albans district, the plan will establish up-to-date policies that help shape new development in the historic village of Redbourn,” the practice said.