Define the measurement basis before calculating
List the current drawing revisions and identify what the estimate covers. A foundation package may include excavation, disposal, formation treatment, sub-base, concrete, reinforcement, drainage, formwork and connection work. State whether paths, canopy foundations, electrical routes and reinstatement are included or priced elsewhere.
The LTA's UK guidance recommends a project specification and pricing document so contractors can price a common scope. Apply that comparison principle to the takeoff: use consistent item descriptions and units, identify provisional work and keep assumptions visible. A low total is difficult to interpret when one bidder has omitted drainage or concrete testing.
Use simple arithmetic without turning it into a design
For arithmetic only, consider a rectangular slab measuring 21 m by 11 m with a uniform thickness of 0.15 m. Its area is 231 m² and its geometric concrete volume is 21 × 11 × 0.15 = 34.65 m³. These dimensions are an illustrative example drawn from supplied reference material, not a recommended PadelSpan foundation size or thickness.
The real takeoff must use the accepted project geometry, including steps, openings, variable thickness and other details. Keep the calculation separate from any order allowance. If dimensions change, update the affected quantities and record the revision rather than carrying forward an attractive round-number total.
| Illustrative item | Calculation | Meaning |
|---|---|---|
| Slab plan area | 21 × 11 = 231 m² | Geometric area in this example |
| Uniform slab concrete | 231 × 0.15 = 34.65 m³ | Net geometric volume before other details |
| Additional thickening | Measured width × extra depth × defined length | Only the volume not already counted in the slab |
| Order quantity | Accepted measured volume plus stated allowance | Procurement decision with a recorded basis |
Count the beam and slab intersection once
When a beam is cast beneath a slab, adding its full depth to a slab quantity can count the shared concrete twice. One clear method is to measure the slab over its defined area and then add only the beam volume below that slab. Another method divides the geometry into separate non-overlapping solids. Choose one approach and describe it.
Record whether beam lengths are measured along centre lines, inside faces or outside faces, and how corners and intersections are treated. A perimeter multiplied by a section area is only reliable when its measurement convention matches the geometry. Have the estimator check junctions and any changes in beam size before issuing the total.
Keep area, volume, mass and installed counts distinct
A compacted sub-base volume is not automatically the delivered loose volume or tonnage. Obtain the supplier and contractor's agreed conversion basis. Likewise, a mesh area does not define reinforcement mass without the selected product, laps, cutting and placement requirements. Use the issued reinforcement schedule for the project.
Separate excavation measurement from disposal pricing, which may depend on material classification, handling and destination. Count anchors from the approved connection schedule rather than assuming the same number at every post. These distinctions make the estimate auditable without pretending that one generic spreadsheet can determine the engineering design.
Show allowances and exclusions where they affect decisions
Use separate columns for measured quantity, allowance, unit rate and scope note. Explain what each allowance covers and who accepts it. Do not bury uncertainty about weak ground, unidentified services or an unresolved outlet inside a single percentage added to concrete.
Build a comparison schedule for contractor quotations. Ask whether the price includes testing, curing, weather protection, survey, pumping, waste handling and the required handover records. Hilti's base-plate guidance shows why anchorage depends on project inputs; pricing anchors before the approved connection exists should be marked as provisional rather than presented as a finished technical scope.
Reconcile the estimate before ordering and at completion
Before procurement, confirm that the takeoff, construction drawings and material specification are at compatible revisions. The Concrete Society's strength-class explanation distinguishes cylinder and cube values; concrete procurement therefore needs the complete local specification and test basis, not a simplified strength conversion entered beside a volume.
During construction, link deliveries and variations to the measured items. At completion, compare the original estimate, approved changes and actual records. Keep the reasons for differences: revised geometry, instructed ground treatment, wastage or measurement correction. This produces useful knowledge for the next project without turning one site's quantities into a universal padel-court rule.
Further reference
Sources & scope
- LTA construction guidance — UK tender specification and pricing context
- Concrete Society — strength-class notation for concrete specification
- Hilti — project inputs needed for base-plate anchorage
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