| Budget line | Evidence needed |
|---|---|
| Scheduled service | Applicable task and current workshop quote |
| Replacement part | Compatible reference, quantity and item condition |
| Installation | Labour, setup and final checks |
| Uncertain work | Clearly labelled allowance, not a firm price |
| Time to completion | Availability and workshop dependencies |
Divide the budget into three different jobs
Keep scheduled maintenance, catch-up preparation and repairs in separate groups. Scheduled work follows the applicable service instructions. Catch-up preparation addresses items needed to reach the agreed sale condition, such as an incomplete included-items list. Repairs respond to diagnosed findings. Mixing them into one service figure makes future comparisons difficult.
Use the maintenance planning checklist to identify the first group and the inspection report to establish the others. Ask for the basis of each recommended task. A provisional concern should remain an investigation allowance until its cause and scope are known. This avoids presenting an estimate as either a confirmed defect or a fixed final bill.
A completed-task quotation is one budget input. The complete buying reserve guide connects it to delivery and ordinary use while preserving unresolved essential work outside fixed minor allowances.
Quote compatible parts as identifiable items
Provide the VIN, installed configuration and any required component references to the supplier. Ask the quotation to identify the item, quantity, specification and supplied condition. Record whether it is described as a manufacturer part, an alternative product or a used assembly. Those descriptions should not be treated as equivalent merely because their prices are close.
For body and equipment-related items, follow the generation and facelift matching guide. The same discipline matters for service parts: compatibility must be established for the actual car. A supplier's generic CS55 listing is a starting point for a question, not the final approval to fit the item.
Include the work needed to finish the job
Ask whether labour, consumables, fitting, required setup and final checks are included. Where a component needs additional work before it can be used, identify who provides that work and how completion will be verified. Keep delivery charges and workshop transport separate if they are outside the quoted service scope.
For example, a component-only quotation and a completed installation quotation should be compared only after their missing items are identified. Do not fill those gaps with zero. An unpriced required task remains an open cost. The spare-key checklist illustrates this difference clearly: receiving a replacement item is not the same as receiving a demonstrated working spare.
Put every offer on the same basis
Record currency, quotation date, validity, payment basis and what the provider says is included or excluded. Ask the relevant provider to confirm any applicable charges rather than assuming a price from another market transfers unchanged. Compare alternatives against the same required outcome, not just the first number in the message.
Build the subtotal from identified quantities and unit prices, then add separately quoted labour and other agreed work. Show an explicit allowance for uncertain preparation rather than hiding it inside a part price. Label the allowance as your budgeting assumption. It does not become a supplier commitment or a claim about average CS55 ownership costs.
Account for availability and time off sale
Request expected part availability and workshop scheduling for the actual order. Distinguish a supplier estimate from a confirmed allocation. If a car cannot be offered to customers until the work is complete, record that dependency. A lower quote may have different practical value when an essential component has no confirmed delivery arrangement.
For dealer batches, identify which items can be shared and which remain vehicle-specific. Do not order several apparently identical parts before confirming the applicable references. Keep substitutions subject to technical review. If an alternative part changes the scope or required setup, update both the cost and the completion plan before accepting the change.
Compare the finished purchase, then review actual costs
Bring the preparation budget into the new and used quotation comparison. Show the vehicle price, confirmed preparation, unresolved allowances and delivery basis separately. A used car with a lower asking price may need a different preparation scope; a new stock offer still needs its agreed delivery checks. Neither condition label establishes the final cost by itself.
After completion, replace estimates with invoices and record why the total changed. Retain the item references and final test results for the next comparable purchase, while keeping each vehicle's findings distinct. This produces a budget grounded in your own completed jobs and current quotations, without turning one repair invoice into a universal cost claim for the entire CS55 range.
