1. No deduction shall be made for openings less than 0.5 sq m in area, and no addition shall be made reveals, jambs, soffits, sills, etc. of these openings.
2. No deduction shall be made for ends of joists, steps, etc. not exceeding 0.5 sq m in area.
3. For openings exceeding 0.5 sq m but not exceeding 3 sq m and when both faces are plastered with same type of plaster each deduction shall be made for one face only, and the other face shall be allowed for jambs, soffits and sills which shall not be measured.
4. For openings exceeding 0.5 sq m but not exceeding 3 sq m and when two faces are plastered with different type of plaster or with one side plaster and other side pointed, deduction shall be made on one side of chaukhat (frame)of door an window on which the width of jambs and reveals is less than the other side, and no deduction shall be made for other side.
5. In case of openings of area above 3 sq m, each deduction shall be made for both faces of openings, and the jambs and sills shall be measured and added. In taking measurement of jamb, soffits and sills, chaukhat (if any) shall not be deducted.

Accuracy criteria :

• Plastering on roofs, ceilings and wall should be kept separate.
• Interior plastering of building should be measured separately for each storey.
• Exterior plastering to a height greater than 10 m from average ground level should be measured separately in stages of 3 m each.
• Plastering bands 30 cm or below should be measured in running meter separately.
• Measurement for all plastering should be taken from the dimensions before plastering for length and from top of floor or skirting to the ceiling for height.
• Soffit of stair should be measured as plastering o ceiling.

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