Unit Price Build Up Calculator
Estimate unit price build up for your project with our free calculator. Get accurate material quantities, costs, and specifications.
Reviewed by Abdullah, Technical Content Specialist
Formula
Unit Price = (Material + Labor Hours x Rate + Equipment) x (1 + O&P%)
Add the material cost per unit, the labor cost per unit (production hours multiplied by the fully loaded labor rate), and the equipment cost per unit to get the direct cost. Apply the overhead and profit percentage to the direct cost to arrive at the final unit price. This unit price is then multiplied by the estimated quantity for each bid item to build the total project estimate.
Worked Examples
Example 1: Concrete Flatwork Unit Price
Problem:Build up the unit price for concrete flatwork: $6.50/sf material, 0.04 labor hours/sf at $55/hr, $1.50/sf equipment, 22% O&P.
Solution:Labor = 0.04 x $55 = $2.20/sf\nDirect cost = $6.50 + $2.20 + $1.50 = $10.20\nO&P = $10.20 x 0.22 = $2.24\nUnit price = $10.20 + $2.24 = $12.44/sf
Result:$12.44 per square foot
Example 2: CMU Block Wall Unit Price
Problem:Build up unit price for 8-inch CMU: $3.25/sf material, 0.08 labor hours/sf at $48/hr, $0.75/sf equipment, 28% O&P.
Solution:Labor = 0.08 x $48 = $3.84/sf\nDirect cost = $3.25 + $3.84 + $0.75 = $7.84\nO&P = $7.84 x 0.28 = $2.20\nUnit price = $7.84 + $2.20 = $10.04/sf
Result:$10.04 per square foot
Frequently Asked Questions
What is a unit price build-up in construction estimating?
A unit price build-up is the detailed calculation of the cost to install one unit of a work item, such as one square foot of concrete, one linear foot of pipe, or one cubic yard of earthwork. It breaks down the total unit price into its component costs: materials, labor, equipment, and overhead and profit. This bottom-up approach provides transparency and accuracy in pricing, allowing contractors to adjust for site-specific conditions. Unit prices are the building blocks of detailed construction estimates and are used extensively in public works and heavy civil bidding.
How do I determine the labor production rate for a unit price?
Labor production rates express how much output a worker or crew produces per hour, or conversely, how many labor hours are needed per unit of work. Sources include RSMeans cost data, historical project records, manufacturer installation guides, and union productivity studies. For example, a carpenter might install 30 square feet of formwork per hour, giving a production rate of 0.033 labor hours per square foot. Always adjust published rates for your specific conditions including crew skill level, site access, weather, and complexity. Tracking actual field productivity builds the most reliable database for future estimates.
What overhead and profit percentage should I use for unit prices?
The combined overhead and profit (O and P) percentage typically ranges from 15% to 35% in construction. General contractors commonly use 20-30%, while specialty subcontractors may use 15-25% depending on risk level and market competition. The overhead portion should reflect your actual indirect business costs divided by your annual direct cost volume. The profit portion depends on the project risk, your backlog, and market conditions. Public works projects often require O and P to be listed separately, with overhead at 10-18% and profit at 5-12%.
References
Reviewed by Abdullah, Technical Content Specialist · Editorial policy