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Convert deck/conservatory into bricked in room

Brick home with brick extension.Bottom story of extension is used for spare rooms.Top is a conservatory ( off dining area) and deck. I have put a stairwell in conservatory for downstairs access. All certified. Now I want to remove conservatory ( use as green house) and "brick" in the area's including a roof to make deck/conservatory area one large "room" with the stairwell in it. Also wanting to create a door way to here via a window space - will need to be made bigger. Will have full plans drawn up. Appx area is 10 metre long, 4 metre wide max.