Why site material use never matches the BOQ, and where it goes

A BOQ line says 40 tonnes of reinforcement for a slab, based on the drawing. It does not know that the bar bending schedule changed after a revision. Nor does it know the supplier delivered 12 metre lengths for a 9 metre cut.

Drawings are measured net. Sites consume gross. That difference is the first place the numbers split, and nobody records it.

Treat the BOQ as the budget for one activity. Treat the site store as the ledger of what actually left the shed. Reconciling the two is a monthly job at best, and usually a rushed one.

Start with the purchase order. It lists diameter, grade and tonnage. The goods receipt note then records what the weighbridge slip says, and the two rarely match to the kilo. Mill tolerance alone moves the number.

Next comes the store issue to the bar bending yard. If the issue slip names no pour or element, the tonnage lands in a general bucket. Cutting offcuts then pile up in a corner and get sold as scrap, often unrecorded.

Last, the running bill measures the steel in place. The quantity billed is net of binding wire, laps and chairs. So the purchase, the issue and the bill each tell a different truth.

Cement leaks through torn bags, rain damage, spillage and mix design set by the batching crew. A ready-mix pour is billed by delivery challan volume, and returned concrete or an overfilled formwork adds to it. Bag cement is counted at the gate and rarely again.

Shuttering is not consumed, it is reused. Plywood sheets, props and steel plates have a planned number of cycles. Sites push past that number, then write off the loss in one go at handover.

Track shuttering as issued stock with a return date, not as a purchase. A sheet that does not come back should raise a question the same week.

The record has to fix a few fields at the moment of issue, not afterwards. Every issue slip carries the activity code, the element or pour, the gang and the person who took the material. Without those, wastage cannot be told apart from theft or misposting.

Add a wastage entry as its own transaction. Offcuts, broken bags and rejected concrete are booked with a reason. Wastage written openly is a number you can manage, while wastage hidden in the issue is an argument.

Stop edits on closed days. Once the store keeper signs a day, a change should leave a trail. A software build for a construction firm can enforce all this on a phone at the store window.

Do not reconcile the whole site at once. Pick one activity, such as the first floor slab, and line up four numbers: BOQ quantity, issued quantity, recorded wastage and billed quantity. The leftover is the unexplained part.

Review it with the site engineer and the store keeper in the same room. Short meetings work, and the question is always the same. Where did the difference go, and who signed for it?

Next month, add a second activity. In a quarter you have a wastage norm for steel, cement and shuttering drawn from your own sites, which beats any handbook figure.