At a glance
Job costing is a comparison, not a verdict. It keeps estimated and actual inputs attached to one job so a named owner can distinguish scope change from purchasing, labour, travel, waste or an assumption that needs review.
01 / Trigger and problem
Reconcile when actual scope or cost is known enough to compare.
The trigger is a reviewable estimate plus actual material, bought-in, labour, installation and approved-variation information. The problem is not a variance by itself; it is a variance with no source, scope explanation or accountable owner.
Keep estimates, actuals and approved changes separate. A forecast is not evidence of achieved margin, and one unusual job is not a reliable pricing policy.
02 / Inputs, owners and output
Give the commercial owner an explainable reconciliation.
The estimator owns quoted assumptions, production and installation owners supply actual use or time from agreed sources, purchasing owns supplier cost evidence, and the commercial owner classifies approved scope changes. The output is a reconciliation showing what changed and why.
| Input | Responsible owner | Concrete output |
|---|---|---|
| Revenue, scope and exclusions | Estimator / commercial owner | Estimate baseline |
| Material and supplier cost | Production / purchasing | Source-dated actuals |
| Labour and installation | Stage owners | Agreed actual inputs |
| Approved scope variation | Commercial owner | Separated variation value |
| Review and action | Costing owner | Explained variance and next check |
03 / Fictional process artefact
Explain the variance before interpreting it.
This is a fictional three-site rollout example using synthetic figures. Estimated direct cost is £2,400 and recorded actual direct cost is £2,620. The costing owner separates £140 of approved additional location scope and £80 of additional travel instead of recording one unexplained overrun.
04 / Current state
The worksheet is implemented; live profitability is not claimed.
The browser-local costing worksheet and blank reconciliation downloads are implemented on this website. They calculate from values entered in the current browser. Spectra does not claim a live costing engine, time capture, supplier feed, accounting connection, market-rate database or automated profitability record.
| State | Inspectable now | Boundary |
|---|---|---|
| Implemented on this website | Browser-local worksheet and blank reconciliation | User-supplied values; no server-side job record |
| Demonstrated | Synthetic estimate-versus-actual scenario | No customer outcome or achieved margin |
| Access / application dependent | Accounting, purchasing and operational actuals | Requires provider and SaaS validation |
05 / Prerequisites and limitations
Agree the commercial rules before comparing percentages.
Define cost categories, source systems, labour treatment, overhead allocation, margin and markup terminology, variation approval, reconciliation timing and access rights. The business must validate financial controls and obtain its own accounting, tax and commercial advice.
- Consistent estimate and actual cost taxonomy
- Documented source and cut-off date for each actual
- Clear treatment of VAT, overhead, rework and approved variations
- Access control and review for commercially sensitive values
06 / Fit and next action
Use the tool for a transparent scenario, not a profitability promise.
This may fit teams that can supply a reviewable baseline and want to learn why comparable jobs differ. It is not a live finance system, an accounting ledger, a market-pricing service or a guarantee of profit, and it should not drive policy from one synthetic or exceptional job.
Run the browser-local worksheet with synthetic values, download the blank reconciliation and compare the fields with your current review. Then take one redacted cost pattern to a workflow conversation if a protected application evaluation is still relevant.