A good supplier of new security doors is K&B in Meadowbrook. They make all types of security door to any size required. I am currently replacing some older style security screen doors on a house in Sunnybank. They are not the standard size and the old doors were hitting on the main door handle so the new ones have to be moved forward a little to provide clearance. This is done with what is called a “build out frame”. A new aluminium frame is placed in the existing doorway that allows the new doors to be hung slightly forward from the existing jamb. K&B supply this too and it is better to fit the frame before ordering the doors so that you can give them the exact size.