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Window & door openings
Openings in external walls for doors, windows, etc. are now measured as composite items when using NRM2. Clause 14.12 states that opening perimeters are to be measured in linear meters as extra over and include all work to sills, thresholds, steps, etc. The one item not included appears to be damp proof courses, which have to be measured separately.
The drawings must contain full details of the work to be carried out to the opening perimeter.
The reason given for this approach is to help the QS in allocating the relevant costs to a cost analysis.
Duncan Cartlidge Online