Unlike brickwork or any masonry calculation, the calculation of the painting area for joineries such as doors, fences, windows grills, fences, and shutters is a little bit tricky.
Since every item comes with different designs (Open, closed designs) and girth, we can’t measure it as a flat surface. Meanwhile, we can’t ignore the work done by contractors on these uneven surfaces.
So to compensate for the work done by the contractor, the measurement shall be taken as flat surfaces, and specific coefficients will be multiplied by that area.
Painting Coefficient
The painting coefficients for different surfaces has been mentioned in the Indian Standard Code IS 2000 (Part 15) – 1987. We have listed some of them below.
| Painting Area | Multiplying Coefficient | Multiplied for |
| Panelled or framed and braced door, windows etc | 1.30 | Each side |
| Treills work one way or two way | 2.00 | Overall |
| Carved or enriched work | 2.00 | Each side |
| Fully venetianed or louvered doors windows etc. | 1.80 | Each side |
| Corrugated sheeted steel doors or windows | 1.50 | Each side |
| Collapsible gates | 1.50 | Overall |
| Ledged and battened or ledged, battened and braced, doors, windows etc | 1.30 | Each side |
| Flush doors | 1.20 | Each side |
| Weather boarding | 1.20 | Each side |
| A.C Corrugated sheeting in roofs, side cladding etc. | 1.20 | Each side |
| Corrugated iron sheeting in roofs, side cladding etc. | 1.14 | Each side |
| Wood single roofing | 1.10 | Each side |
| Plain sheeted steel doors and windows | 1.10 | Each side |
| Rolling shutters interlocked lathes | 1.10 | Each side |
| A.C semi Corrugated sheeting in roofs, side cladding etc.(or Nainital pattern using plain sheets) | 1.10 | Each side |
| Boarding with cover fillets and matchboarding | 1.05 | Each side |
| Partly panelled and partly glazed or gauged doors, windows etc. | 1.00 | Each side |
| Wire gauge shutters including painting of wire gauge | 1.00 | Each side |
| Fully glazed or gauged doors, windows etc | 0.80 | Each side |
| Tile and slate battening | 0.80 | Overall |
| Partly panelled and partly glazed or steel gauged doors and windows | 0.80 | Each side |
| Fully glazed or gauged steel doors and windows | 0.50 | Each side |
Example Painting Area Calculation
For Example, Assume a contractor paints an enriched surface (door) of 3’ x 7’.
Total Painting Area = Area of flat surface x painting coefficient = 3x7x2 = 42 Sq.ft (each side)
Happy Learning 🙂
