Splitting Attic Bedrooms Into Two

The original windows were removed and replaced by the bow window in that attached photo which is not in the craftsman style.
Splitting attic bedrooms into two. Have secured all the required planning permission to split the house into two. For survey purposes the space can never technically be a bedroom. A ceiling light and double socket are located approximately centrally. I have a 2 bed house and want to make 1 bedroom into 2 it has 2 windows r radiators 2 light s and if i do can i sell as a 3 bed.
We have a large bedroom 18 x 25 which originally in this craftsman house was an attic storage area needs to be split into two bedrooms. Either side of the window imbedded. Were thinking of splitting this room into 2 smaller bedroom adding another velux window. It was converted donkeys years ago to the building regs at the time.
My attic conversion is currently a single space with an entry stair case at one end a dormer window at the other. Purchased a 3 bedroom terraced house. Just as a foot note the flooring is that of joist that has normal floorboarding on i would say the joist are of orginal construction of the house and six inches in depth so i see no issues with the flooring just the permission to split a room. The big advantage of using folding multi panel kids dividers is that you can use them for decoration and to brighten up your kids bedroom with their lively colors and with the kids own artwork.
I thus have a two bedroom house with an attic conversion. The house was sold as two bed with possiblity to split the attic room into two bedroooms. If your kids room is large enough use folding multi panel kids dividers to split the room into two portions.