Lydia Smith works for Stroud District Council after completing a two-year course in construction and civil engineering.
She told the Gloucestershire Echo: “I work in building conservation and construction so I don’t always look glamorous at work.
“This was my chance to look glamorous.”
Her mother Sonia added: “I think she can inspire many other young women and that you don’t have to be a man to work in her industry.”
Lydia Smith will now compete in Miss England pic.twitter.com/vVTMwjRk8L