Compare an unpriced BOQ with a quantity schedule: item mapping, units and differences

Step 1: Map item names and specifications

BOQ item names follow the client’s terminology, while the takeoff usually follows the drawing legend. Start with a mapping table that pairs the two descriptions row by row.

Flag items that do not map one-to-one, such as one BOQ row corresponding to two schedule rows, or the reverse. Record how the quantities should be combined.

Step 2: Align the units

• Each vs. set: Some BOQs treat a switch and its plate as one set. State whether ‘each’ in the schedule means one device or one complete set.
• Lump sum: Quantities cannot be compared directly for bundled items such as ‘power outlets, lump sum’. Ask which components are included, or provide explanatory subtotals from the quantity schedule.
• Socket count vs. device count: If the BOQ measures individual sockets, one double-socket outlet must be converted to a quantity of 2.

Step 3: Investigate quantity differences

If the quantities are different even after matching the mapping and units, check the items with the largest difference in the following order.

1. Is the drawing revision the same (Revision control)
2. Does the scope match: dwelling units only, common areas included, and the same buildings?
3. Does the dwelling count for each type match? (Building-total calculation)
4. Are there duplicates or omissions? (Duplicate-count causes, Common-area omissions)
5. Does the BOQ include allowances or spare quantities?

Record the cause in one line in a ‘Reason for difference’ column and retain the decision about which quantity is authoritative. If the client must decide, prepare a formal query.

What Voltix includes in a BOQ comparison

On request, Voltix supplies an unpriced BOQ comparison alongside the quantity schedule. It includes item mappings, quantity differences and possible causes. Items unresolved from the drawing are marked ‘Review required’. Customers make final quantity decisions and raise queries with the client.