No.1 Traveller will double its capacity in both London Gatwick terminals over the next year.
The lounge provider, which is in the process of rebranding as No.1 Lounges, will also upgrade its facilities at London Heathrow, Birmingham and Edinburgh airports.
Rendering: How the No.1 Traveller lounge in Gatwick North Terminal will look
It has already begun renovation work at its LGW North Terminal facility, which will result in an increased size, upgraded interiors and more seating choice.
A "refined, seasonal" food and drinks menu is also being introduced and staff will wear a new uniform from next month.
Phil Cameron, CEO of No.1 Traveller, said: "We are making a big statement with our lounge brand refresh - inspired by the jet-set age of travel, a new-look website, and lounge upgrades.
"We want to show our guests just how serious we are about putting the glamour back into pre-flight."
Two months ago, Etihad Airways chose No.1 Traveller as its preferred lounge partner at Edinburgh airport (see news, July 14).
Graham Smith