Theatr Clwyd has won a prestigious Olivier Award for its production of Home, I'm Darling.
It won the Olivier for best new comedy at Sunday night's awards, and was nominated in four other categories.
The show was co-produced with the National Theatre and follows one woman's quest to be the "perfect 1950s housewife" in the present day.
It has since transferred to the West End after its original run at Theatr Clwyd in Mold, Flintshire, last year.
Tamara Harvey, Theatr Clwyd's artistic director, said: "We literally made it in Wales, the set and costumes were made by our amazing team of crafts people at Clwyd and we opened it there first."
Katherine Parkinson, who plays the lead role, was nominated for best actress and Susan Brown, who plays her mother Sylvia, for best supporting actress.
Its designer Anna Fleischle was nominated for best set design and best costume design.
Ms Harvey said the team first started the comedy seven years ago but had worked on other things in the meantime:
She said: "We're not just really slow.
"We know that we make great theatre up there in north Wales but hopefully the rest of the world have got a clearer sense of that as well now.
The show has another week in the West End before going on tour and then returns to Theatr Clwyd for its final week.
The Olivier Awards were established in 1976 and celebrate the world-class status of London theatre.
The event was at the Royal Albert Hall and hosted by comedian Jason Manford.