Assemblies
Build reusable recipes that combine products into composite rates.
Assemblies
An Assembly is a reusable formula that combines several products into one composite rate. Define it once, apply it forever — the rate updates as your supplier prices change.
The Library → Assemblies area has three tabs:
- Assemblies — your saved assemblies plus any system templates you’ve added.
- Catalog — a browsable library of system templates you can copy into your own list.
- Variables — every variable available to expressions, system and custom.
In this section
- Creating assemblies — when you need one and how to build it.
- Variables — making one assembly cover many cases (different thicknesses, coats, waste factors).
- Applying in the rate builder — pulling an assembly into a single estimate line.
- Tips and pitfalls — naming, waste factors, deletion rules.
When to use an assembly
You need an assembly any time a single product doesn’t capture the full cost of one unit of work. If the line is just “deliver 1 m³ of concrete”, a direct product price is fine — no assembly needed.
- Creating AssembliesBuild a reusable recipe that produces a fresh, accurate rate every time it's applied.
- VariablesNamed numeric inputs that let one assembly cover many cases — different thicknesses, coats, or waste factors.
- Applying Assemblies in the Rate BuilderHow to compute a single estimate line's rate from an assembly when filling in an estimate by hand.
- Tips and PitfallsNaming, waste factors, deletion rules, and the small habits that make assemblies pay off.