Break Up Details (Don's use Rate, its PWD rate 2008)

Supplying and laying polythene sheet
Considering 216 sft. of work
Assuming 2 Nos. 9'-0" x 12'-0" pieces with 6" over lap to cover 216 sft.
Extra length required:
2 x 9'-0" = 18 rft.
2 x 12'-0" = 24 rft.
42 rft.
1. Cost of polythene sheet:
2 x 9'-0" x 12'-0" = 216 sft.
Lap: 42 x 0'-6" = 21 sft.
= 237 sft. @ 150 Per % sft = 355.5
2. Skilled labour for laying polythene: 0.25 No. @ 200 each = 50
Total = 405.5
Profit 0.1 = 40.55
Overhead 0.035 = 14.19
= 460.24
Add VAT with adjustment factor 1.04712 0.045 = 21.69
Grand total = 481.93
Rate per sft. = 2.23
Rate per sqm. = 24
Say, 24 .00 Per sqm.