How much can I add to a door to widen it?

Does anyone know what is a recommended maximum amount that can be added to the a door edge to make it wider?

I have a brick recess in a bedroom that would suit two 485mm wide doors, with a 50mm frame. But the cupboard doors are only made in 520mm, so I plan to buy an 820mm bifold and separate it to 2 x 405mm doors, meaning that I would need to add 40mm to each long side of each door to widen them by 80mm, that is 485mm wide each in total.

Has anyone done this before?


Read and reply to the full thread at RenovateForum.com....