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The opening is only as big as the hole in the wall whatever your choice, sercurity is probably better with Bi folds than French doors, makeing the hole larger is a big job removing brickwork, fitting a lintel, makeing good the floor and plastering. Avoid upvc for Bi fold Ali and top quality...

Fit a lock barrel with a thumb turn on the inside instead of a keyslot, one screw and you have it.

Expect to pay about £25 a unit fitted if there's a few, these should last about 15 years if properley packed.

get a local glazier there's so much to go wrong if you diy will you damage the beading, do you know the air cavity,its easy for a novice to break a unit trying to fit it. A small unit eg in a sash will only be about £50 cheers David,