Drawing quantities vs. order quantities: allowances, pack sizes and site changes

Adjustments from drawing quantities to order quantities

• Allowance (damage, loss and reserves): Additional quantities for damage, loss or extra installation during construction. Set them by item according to company policy and site experience.
• Pack size: Round order quantities up to the next pack size when materials are sold in packs of 10 or 50.
• Accessories: Plates, flush-mount boxes, covers and fixing screws may not have drawing symbols but must be ordered to suit the device quantities.
• Site changes: Additions or deletions caused by option changes, joinery changes or client requests.
• Confirm part numbers: Even a grounded double-socket outlet has different part numbers depending on its manufacturer, series and color.

Keep takeoff and order schedules separate

Keep the drawing quantity schedule fixed to the design basis, and maintain the order schedule in a separate sheet calculated in this sequence: ‘quantity schedule × allowance factor + accessories → round up to pack size → part number’. Use the quantity schedule to explain quantity differences with the client and the order schedule for internal materials management.

Allowance rates and pack sizes vary by company and supplier. The table’s figures are illustrative only.

Customer checks before ordering

1. Have all review-required items been resolved?
2. Do the dwelling counts and common-area scope match the latest drawings?
3. Do the manufacturer, series and color match the specification or client-approved materials?
4. Do pack-size rounding and allowance rates follow company policy?
5. Do delivery dates and phased deliveries fit the construction schedule?

Voltix provides the quantity schedule and evidence. On request, we also prepare a part-number order schedule for the selected manufacturer and series. Customers must resolve review-required items and decide what to order. Preparing an order schedule does not mean Voltix places materials orders.