Standard internal door sizes

[mrsflash]

Have just started renting a flat through work but the sofa won't fit through the doors as they are small. What is the standard size of an internal door because I can't find a settee small enough to go through this one. Thanks.

[toptips]

usually 30 inch,though these days more 33 inch are being fitted as standard.you will also lose some because of the rebate on the frame or slamming strip.