How big a hole should I cut for new door opening?

[cliffh]

I have a house in Hungary and want to install a new door through an existing wall. How much space should I allow for the liner assuming it is a standard door size. It is not a supporting wall so will I need any form of support above the door.

Many thanks

cliff

 

[jeds]

Allow a 10 to 15mm gap around the outside of the door lining. Door linings are different thicknesses so you need to find out the overall dimension of the one you will be using.

If the wall is masonry you will need some form of lintel regardless of whether it is load bearing. The constant closing of the door will shake the masonry loose otherwise. In this case a 25mm corrugated steel should do.

 

[cliffh]

Thanks, will follow advice

 

[noseall]

You generally need a 32" builders opening for a 2'-6" door and casing.

If i am knocking a hole through masonry then i tend to make the opening about 50mm bigger (than 32") allowing me to then dab some plasterboard up the ragged sides of masonry.

This plasterboard can be tapped perfectly plumb. Once set you then have a perfect surface upon which to fix the casing. I make sure that i take note where the full block or brick ends are so that i get a decent fixing.

Always fix the hinge side first then pack out the latch side. A 32" builders opening will mean fitting about 7mm packers up the latch side.