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Assemblies: one measurement, every line

How a terrace per m² becomes boards, joists, fixings and labour, and how to build your first five.

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An assembly is a service driven by one measurement. A composite terrace per m² expands into boards, joists, fixings and labour; a roof area expands into membrane, battens, covering and labour. You measure once on site, pick the assembly, and the quantities fill in.

  1. 01In the price book, create a new assembly and choose its driving unit (usually m² or m).
  2. 02Add the lines it needs: materials with a waste percentage, fixings per unit, labour in hours per unit.
  3. 03Set the price and see the cost and margin of the whole assembly per unit.
  4. 04Test it against a finished job: run last month’s terrace through it and compare with what you invoiced.

Why it matters beyond the estimate

  • Two people quoting the same terrace get the same lines.
  • Accepted lines become purchase orders per supplier with the same quantities, waste included.
  • When a supplier price changes, the effect on the assembly’s margin is shown, and you decide once.