Interactive Generator · 2026
STP BOQ Generator
Generate a rough Bill of Quantities for a sewage treatment plant. Enter the capacity in KLD, pick a technology, and see how the installed cost splits across the six standard BOQ heads.
How the installed cost divides across BOQ heads
Your plant
Design flow the plant is built for, in kilolitres/day.
Moving Bed Biofilm Reactor — common mid-range choice
Bill of Quantities — cost split
Six standard BOQ heads for a MBBR plant of 100 KLD.
| BOQ head | Share | Amount |
|---|---|---|
| Civil | 40% | Rs 14,00,000 |
| Mechanical | 30% | Rs 10,50,000 |
| Electrical | 12% | Rs 4,20,000 |
| Instrumentation | 8% | Rs 2,80,000 |
| Piping | 6% | Rs 2,10,000 |
| Commissioning | 4% | Rs 1,40,000 |
| Total | 100% | Rs 35,00,000 |
Where the money goes
Civil and mechanical works dominate the capital cost of almost every STP.
Roughly 70% of the outlay is civil and mechanical — the tanks, structures, blowers and pumps. The balance covers electrical, instrumentation, piping and commissioning.
Membrane processes (MBR) push more cost into mechanical and less into civil; conventional processes invert that — but the head shares here are held constant for a quick concept split.
How this is calculated
- Total installed cost = capacity × per-KLD rate = 100 × Rs 35,000 = Rs 35,00,000.
- Each BOQ head = total × its fixed share — Civil 40%, Mechanical 30%, Electrical 12%, Instrumentation 8%, Piping 6%, Commissioning 4%.
- Civil Rs 14,00,000 and Mechanical Rs 10,50,000 together make up ~70% of the plant cost.
Indicative concept-level figures for early budgeting only. Actual BOQ quantities and rates depend on site, inlet quality, discharge norms and vendor selection — confirm with a detailed design before procurement.
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