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Where Masonry Estimates Go Wrong
Masonry bids fall apart when small factors multiply over thousands of square feet, like an overly optimistic waste factor, a grout cell no one counted, or a lintel left out of the takeoff.
Good masonry estimating accuracy comes down to understanding what the job needs, how much each part will cost, and where unexpected expenses might arise. Here are five areas worth checking before submitting a bid.
Count the blocks, then add waste
The first step in every estimate is to determine the amount of materials needed. For a CMU block takeoff, calculate the wall area, subtract doors and windows, and work out how many blocks are needed. A standard 8 × 8 × 16-inch concrete block will need about 1.125 blocks per square foot, excluding waste.
The basic count is just the beginning, though. Some blocks may have to be cut, some may break during handling, and special units may have to be used for the corners. And for brickwork, calculate brick veneer square footage separately, accounting for openings, corners, and returns.
Example: A 1,000 sq ft wall with 120 sq ft of openings leaves 880 sq ft, or about 990 blocks. Add an allowance for cuts, breakage, and corner units. At 5% (use your own historical rate), that’s roughly 1,040 blocks.
Mortar should be given the same treatment. The amount of mortar waste factor per square foot is dependent on the masonry unit type, joint thickness, and working conditions. Underestimating it can mean extra material orders and work interruptions, while overestimating means paying for material the project may not use.
Price labor for the real site
How quickly can the crew lay the specified masonry under actual site conditions? That number directly impacts labor costs.
Straight, accessible walls are generally easier to build than walls with complex patterns, high elevations, and/or limited access. Additional time is also required to move materials, set up scaffolding, cut units, and clean the site.
Assuming only ideal working conditions for the estimate can lead to labor costs exceeding the budget really quickly. This is why you should make use of realistic production rates and account for the work required beyond laying blocks.
Don’t skip reinforcement and special units
Not every block is part of a standard wall section. Reinforced cells, lintels, and bond beams can add materials and labor that are easy to overlook.
Masonry rebar grout fill volume depends on which block cells need grout, the reinforcement layout, and the wall design. Likewise, lintel bond beam quantities require checking the structural drawings for locations, lengths, special units, rebar, and grout.
The above is important to know because missing these items can leave a bid short on both materials and installation costs. To avoid such cases, it is considered best to always check the drawings and specifications for requirements.
Price the full cost, then check your margin
The cost of a masonry project isn’t limited to the cost of materials and labor. You also need to account for equipment, delivery, mobilization, subcontractors, overhead, and an appropriate allowance for project risk.
After these costs have been taken into consideration, you need to understand what your profit margin will be by comparing the total cost with the proposed bid price. A low bid may win the contract, but if key expenses are missing, the job can end up costing more than it earns.
Read the scope and payment terms
Verify what the contract entails before you submit the bid. Think about questions like: Have material specifications been finalized? Who is responsible for equipment, cleanup, and the additional work if there’s a change in scope?
Then, consider the payment terms, too. You may need to pay for materials and equipment before the contractor receives payment for completed work. Here, it can also be beneficial to divide the estimate into different portions like floors or elevations so that they can monitor the costs, measure progress, and create payment applications.
Final Check Before You Submit
Ultimately, a reliable masonry estimate helps tie every quantity to a realistic and reasonable cost. So, when estimators double-check these numbers before sending out the bid, they can price with greater confidence, reduce avoidable surprises, and protect their profit margin.
