Ab Fab's Patsy and Peckham's own Del Boy were VIP guests as the Mayor, Cllr Brian Jupp, cut the tape at Covers in Blackwater Park.
But while Joanna Lumley and David Jason were missing out on the fun, two of the country's best known lookalikes, Sue Bradbury and Maurice Canham, turned a few heads.
The company moved into the new premises in September and is already benefiting from a building five times the size of its old Church Lane depot.
Group operations director Andrew Waters said: "There has been a good response since the opening of the store.
"We have a full range of timber and building material and turnover has considerably increased.
"The opening went really well and we were joined by two superb lookalikes."