convert one bedroom flat into two bedrooms flat

[Tadddas]

Hello. What I want to know is what requirements are to convert one bedroom flat into two bedrooms flat, two bedrooms flat into three bedrooms flat. I think the square meterage mast be above certain figure. What about lease? Thanks
Sorry if it is in wrong section

[Poppy]

Has the freeholder given consent? Have you obtained planning permission from the council?

[Tadddas]

Has the freeholder given consent? Have you obtained planning permission from the council?

Do I need planning permission to partition my room?