Spreadsheet vs build record: where the sheet breaks
A spreadsheet tracks what you spent. It cannot hold the receipts, the staged photographs, a certifier's countersignature, or a tamper-evident audit trail — which are the four things anyone assessing your car actually asks for.
What the spreadsheet is genuinely good at
Budgeting. It is the honest running total of what the build has cost, and nothing replaces that. The failure is not the sheet — it is what people expect the sheet to do later.
Where it breaks
| Job | Spreadsheet | ModVault |
|---|---|---|
| Running cost total | Excellent | Yes — receipts ledger |
| Holds actual receipts | No | Yes, attached per modification |
| Staged build photographs | No | Yes, dated per modification |
| Certifier countersignature | No | Yes, via code or signing link |
| Tamper-evident | No — any cell can be edited silently | Yes, hashed audit trail |
| Producible roadside in 60s | No | Yes, Roadside Pack |
| Maps to VSB14 sections | Only if you type them | Built in |
| Survives a lost laptop | Only if backed up | Cloud-synced |
The tamper-evidence point is the real one
A spreadsheet cell can be changed at any time by anyone with the file, leaving no trace. That is exactly why it carries no weight with an assessor, an insurer or a buyer. A hashed record where later edits are visible is a fundamentally different kind of evidence.
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Frequently asked questions
Can I import my existing build spreadsheet?
You can enter existing modifications with their original dates and attach scanned receipts and photographs, so historical builds can be brought across.
Keep reading
This guide is general information for Australian vehicle owners, not legal or engineering advice. Requirements change and are applied at the discretion of your state authority. Always confirm with your road authority or a licensed certifier before starting work.