In the UK, Rules of Measurement says:
1. Any item with a girth less than 300mm should be measured in Lm.
2. Any item with a girth greater than 300mm, should be measured in m2.

Sounds simple and it is, except where door frames are involved.

The main problem is that Quantity Surveyors always tend to assume that the girth of a door frame (measured architrave to architrave), is less than 300mm. However, on many occasions, I have been on sites doing re-measures

Absolutely!

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Happy Estimating

Mark

Painting Estimator-panddonline

The most accurate way of costing any commercial painting project is to measure each item of decoration works and apply the appropriate (m2) 'all-in' painting rate.

Doors are measured in (m2).   You should measure the door 'flat', both sides (if you are painting both sides of the door).  You then multiply your measure for one door by the total number of doors of this size and type.

So, if you have 25nr. flush doors (838mm x 2040mm) and you are painting both