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Project bond scheduleProcurement arithmetic

Masonry Bond Schedule
Takeoff Worksheet

Turn a unit rate verified from the actual wall type and bond layout into net, allowance, pack, and order quantities.

Who it's for: bricklayers, estimators, and contractors converting a verified unit rate into order quantities before procurement.

No universal English/Flemish multiplier
The former page doubled face counts and added unverified 5% or 10% bond factors. Actual quantities depend on the detailed bond layout and unit schedule. BS EN 771-1 specifies clay-unit characteristics and tolerances; it does not specify a standard unit size or a bond takeoff factor.
Scheduled takeoff
entered project values

How to use this calculator

1
Measure the scheduled wall item
Apply the project or selected measurement rules consistently and record the net area for this exact wall type.
2
Derive the unit rate from the layout
Use the actual unit dimensions, joints, thickness, bond geometry, and detail takeoff—not a generic bond multiplier.
3
Add scheduled standard units
Enter additional standard units for quantified returns, cuts, or details. Keep purpose-made specials as separate procurement items.
4
Apply the project allowance and supplier pack
Use current project and supplier values; the worksheet rounds the resulting order up to full packs.

The formula

Net units = area × verified units/m² + additional scheduled units.
Allowance quantity = ceil(net units × (1 + allowance/100)).
Full packs = ceil(allowance quantity ÷ units per pack).
Pack-rounded units = full packs × units per pack.

Worked example

Example
A 10 m² schedule item at a verified 60 units/m² gives 600 net units. A 5% allowance gives 630 units. With 500 units per pack, the order is two full packs representing 1,000 units.

When this estimate will be off

  • Does not derive a bond layout, wall thickness, unit rate, opening deduction, return, reveal, cut, special, or allowance.
  • Purpose-made specials and differently priced units should remain separate schedule items rather than being converted to standard-unit equivalents without a documented basis.
  • BS EN 771-1 addresses clay masonry-unit characteristics and performance; it does not prescribe a universal standard size or bond multiplier.
  • Confirm pack quantities, break-pack policy, minimum order, damage replacement, batch matching, lead time, and availability with the supplier.

Frequently asked questions

A common mistake: Does not derive a bond layout, wall thickness, unit rate, opening deduction, return, reveal, cut, special, or allowance.

That rate must come from the actual bond layout and wall type. A universal face multiplier does not capture headers, thickness, returns, cuts, specials, or project measurement rules.

The result assumes full-pack ordering. Confirm whether the supplier permits split packs and adjust the procurement decision outside this worksheet.

No. It specifies characteristics and performance requirements but explicitly does not specify standard sizes or standard work dimensions.

Sources

  • BS EN 771-1:2011+A1:2015 — current BSI specification for clay masonry-unit characteristics, tolerances, performance, marking, and delivery information; it does not specify standard sizes
  • RICS NRM 2 — official detailed-measurement framework; select and apply the applicable edition and project measurement rules

This free Brick Bond Pattern Calculator is built and maintained by DataDrivenAEC, using the relevant codes and standards. It does not substitute for professional judgment.