Masonry Takeoff:
Blocks and Bricks Per Square Foot

Blocks per square foot

The standard 8x8x16 concrete masonry unit (CMU), laid with a 3/8-inch mortar joint, yields about 1.125 blocks per square foot of wall face. That number comes directly from the unit geometry: each block occupies a nominal face area of 8 inches high by 16 inches wide, or 128 square inches. Divide 144 square inches (one square foot) by 128 and you get 1.125 (Concrete Block Calculator, 2026). This factor is reliable for standard running-bond coursework and holds across most commercial and residential CMU applications.

In practice, apply the factor to net wall area — after deducting openings — and round up. The rounding cushion handles minor field waste and chipped units. Track special-purpose units as separate line items; bond beam blocks, lintel blocks, and corner units have different face dimensions and different unit costs, and lumping them into the standard count inflates one item while hiding the others.

Bricks per square foot

A standard modular brick wall, laid in single-wythe running bond with 3/8-inch mortar joints, requires about 7 bricks per square foot (Georgia Masonry Supply, 2025). That count applies to the most common modular brick size (3-5/8 inches high by 7-5/8 inches long face dimension with joint). It is the constant most estimators carry in their heads and it is correct for the majority of commercial face-brick work.

However, brick specifications vary. Queen-size, king-size, Norman, and utility bricks each have different face dimensions, and each changes the per-SF count meaningfully. Confirm the brick spec — including joint width — before applying any factor. If the architect has specified a non-modular size and you use 7 as your default, you will be wrong by 10–20% in either direction. For double-wythe walls, simply multiply the single-wythe per-SF count by two; the geometry is additive.

• Standard modular brick, 3/8-inch joint: 7 bricks per SF
• Non-modular sizes: recalculate from face dimensions before pricing
• Double-wythe construction: multiply single-wythe factor by 2
• Always confirm brick spec and joint width with the project drawings

Mortar yield

Mortar consumption follows consistent rules of thumb that hold across most masonry types. For brick work, one 70-pound bag of Type S or Type N mortar covers approximately 35 to 40 bricks. For CMU work, the same bag covers roughly 8 to 10 standard 8x8x16 blocks (Georgia Masonry Supply, 2025). Both figures assume standard face-shell bedding for CMU and full-bed mortar for brick — confirm the specification, since full-mortar CMU bedding consumes significantly more.

Add a 10% waste factor on top of the calculated mortar quantity before ordering (Georgia Masonry Supply, 2025). Mortar mixed but not placed, tooling waste, and batch overruns are real costs and consistently undercounted when estimators skip the waste allowance. Sand quantity should be tied directly to bag count: a standard 1:3 mortar mix calls for three parts sand by volume per part cementitious material, so for every bag of mortar you need roughly three to four cubic feet of masonry sand. Make sand an explicit line item rather than a verbal add-on to avoid it disappearing from the bid.

Surface-area method

The surface-area method is the correct workflow for any masonry takeoff, regardless of project size. Begin by computing the gross wall area for each individual wall segment: length multiplied by height. Sum gross area across all walls. This gives you a starting number that is easy to verify against the plan dimensions.

Next, deduct all door and window openings. Measure the rough opening dimensions from the architectural drawings — not the frame size — and subtract each opening area from the gross wall area of the wall it sits in. The result is net masonry area. Apply the per-SF block or brick factor to net area only. Applying the factor to gross area before deducting openings is the most common masonry quantity error and it consistently overstates material costs.

Once you have net area per wall, multiply by the appropriate factor (1.125 for standard CMU, 7 for standard modular brick) to get unit counts. Sum across all walls for the project total. This per-wall approach also makes the estimate easier to review and easier to update when the owner revises a window size during VE.

Reinforcement and accessories

Masonry reinforcement has several distinct components that must each be quantified separately — they do not follow from the block count alone. Horizontal joint reinforcement (ladder wire or truss wire) is measured in linear feet of bed joint. Count every course that receives reinforcement per the structural drawings, multiply by the wall length, and convert to the wire product's standard packaging length. Joint reinforcement is cheap per linear foot but is often missed entirely on small projects.

Vertical rebar in grouted cells is a separate quantity. From the structural drawings, identify which cells are grouted, count the number of grouted cells per wall segment, and calculate bar lengths including lap splices and hooks. Grout volume follows from the cell count: a standard 8x8x16 CMU cell holds about 0.67 cubic feet of grout per foot of wall height. Tally grout separately from mortar — they are ordered differently and priced differently.

Finally, include accessory line items that are easy to forget but consistently appear in masonry scopes: continuous wall ties between wythes or between masonry and backup framing, through-wall flashing at lintels and shelf angles, and weep holes at the base of cavity walls. Each of these is a quantity that can be counted directly from the drawings and priced as a discrete item.

• Joint reinforcement (ladder/truss wire): quantity in linear feet of bed joint
• Rebar in grouted cells: count cells from structural drawings, include lap and hooks
• Grout volume: approximately 0.67 CF per grouted cell per foot of height
• Wall ties, through-wall flashing, weep holes: each a separate line item

Questions estimators actually ask