Preparation checklist: define the work before asking for prices
- Mark the shed/slab footprint, finished level, corners, footing or thickened-edge zones, existing services, access, spoil destination and drainage constraints on one labelled sketch.
- Separate excavation, disposal, imported base, compaction, footing concrete, slab concrete, formwork, mesh, membrane, delivery, pump/access, labour, permits and tax into named scopes. Record whether each is measured, supplier-quoted, contractor-quoted, excluded or still unpriced.
- Collect the specified dimensions and product documents; record sellable units beside each line: m³ concrete, tonnes base, sheets mesh, rolls membrane, boards formwork, hours or fixed labour.
- Ask each supplier for quote date, currency, tax, delivery/minimum/load charge, lead time, return policy and exclusions. Ask installers to state preparation, protection, spoil, access, testing and curing scopes explicitly.
What to measure and how to record it
Measure the physical work once, then preserve the handoffs. For excavation and base, record the footprint, excavation depth, base thickness, compaction basis, material density or supplier selling basis, cut/fill and disposal destination. Do not turn an excavation volume into a base order without the separately specified layer and supplier basis.
For footing concrete, list each strip or pad as length × width × depth, identify known overlaps once, then state order allowance and supplier increment. The Concrete Footing Quantity Calculator keeps net, allowance-adjusted and supplier-rounded concrete quantities distinct. For formwork, record every selected edge/run, formed height, number of courses and stock-board length; the Concrete Formwork Calculator keeps board-piece rounding visible.
For slab reinforcement and vapor control, do not infer a sheet count from area alone. Record selected mesh sheet dimensions, orientation, stated laps and spares; record membrane footprint, edge extension, roll dimensions, strip direction and seams. Use the Reinforcing Mesh Sheets Calculator and Under-Slab Membrane Calculator for their independent stock rounding. The live Footing & Formwork Quantity Takeoff guide and Mesh & Under-Slab Membrane Layout guide explain those takeoffs in detail; this page is the quote-scope handoff.
Connect each takeoff to one compatible order or quote line
| Scope | Record to carry forward | Do not hide |
|---|---|---|
| Excavation/base | Measured m³, tonnes or supplier load basis | Cut/fill, compaction, disposal, haul and delivery |
| Footing/formwork | Ordered m³ and whole boards from separate takeoffs | Allowance, increment, selected edges, stakes/bracing and reuse |
| Mesh/membrane | Whole sheets and rolls—not only covered area | Product, laps, extensions, offcuts, tape and protection |
| Concrete/labour | Matching m³ rate or fixed quoted amount | Mix, minimum/load charge, pump/access, placing, finishing, curing and tax |
Enter only compatible quantities and rates in the Slab & Shed Base Cost Calculator. It is a cost worksheet, not a layout or structural-design tool: it should price supplied quantities without applying a second package round. A blank price is unpriced, not zero; an all-in contractor quote must replace overlapping detailed lines rather than be added to them.
C15 itemized cost example: six labelled illustrative lines
The following independent fixture combines already-supplied compatible quantities. It is not a recommendation to use these quantities, rates, scope boundaries or currency. Excavation/disposal, delivery, pump/access, tax and contingency are excluded here and must be quoted or shown as incomplete if needed.
| Scope / basis | Calculation | Extension |
|---|---|---|
| Concrete | 2 m³ × USD 150/m³ | USD 300.00 |
| Base material | 3 tonnes × USD 40/tonne | USD 120.00 |
| Mesh | 4 sheets × USD 30/sheet | USD 120.00 |
| Membrane | 2 rolls × USD 50/roll | USD 100.00 |
| Formwork | 8 boards × USD 10/board | USD 80.00 |
| Fixed labour quote | USD 400 fixed | USD 400.00 |
| Direct total | USD 300 + 120 + 120 + 100 + 80 + 400 | USD 1,120.00 |
Each line uses its own labelled selling unit. If the mesh rate is blank, retain the four-sheet line as unpriced and call the estimate incomplete—do not report USD 1,000.00 as a complete total. Record exclusions beside the total so a supplier or contractor can price the missing work without guessing.
Changed-input comparison: concrete quote changes, quantities do not
Keep every C15 quantity and other rate unchanged, but replace the illustrative concrete quote of USD 150/m³ with USD 175/m³. Concrete becomes 2 m³ × USD 175/m³ = USD 350.00, an increase of USD 50.00. The direct total becomes USD 1,170.00. This is a price change only: it does not remeasure concrete, revise base tonnes, add sheet/roll rounding or make excluded scopes priced.
Common ordering mistakes and practical purchase or estimate checklist
- Pricing net geometry as an order: preserve net, allowance-adjusted and supplier-rounded quantities; price the basis the supplier actually sells.
- Adding alternative or overlapping scopes: mesh and rebar alternatives, or an all-in quote and its included detailed lines, must not both be totalled.
- Calling incomplete prices a total: leave blank prices visibly unpriced and request a current quote; zero is a real entered price, not a placeholder.
- Using area for stock order: order whole specified sheets, rolls and boards from their layout takeoffs, with stated laps and offcut policy.
- Hiding site work: make excavation, base compaction, spoil, access, delivery/pump, permits, tax, curing and protection visible as included, excluded or unpriced.
- Final check: attach the labelled sketch; drawings/specification revision; all five takeoffs; SKU/system and sellable-unit quotes; currency/date/tax; delivery and access conditions; labour and exclusions; desired start/lead time; disposal plan; and designer/installer approval.
Sources, scope, and limitations
NRMCA CIP 31 — Ordering Ready Mixed Concrete is official industry ordering context: confirm the selected mix, delivery conditions, minimums, discharge access and supplier increment locally. It does not choose a concrete quantity, mix, price or allowance for this synthetic worksheet.
Macsteel reinforcing-mesh data sheet and Stego Wrap product information are product-specific sources for checking an actual sheet or membrane system. They do not establish universal reinforcement, lap, membrane, support, tape or installation requirements.
Scope limit: drawings, ground conditions, engineer/designer, current product instructions, local authority, supplier and installer determine excavation, bearing, drainage, footing/slab dimensions, formwork, reinforcement, vapor control, concrete specification, access, safety and compliance. All quantities and USD rates below are synthetic C11–C15 fixture values, illustrative only—not recommendations.