Workshop planning documents

Australian modification guide

Getting engineer sign-off on a modification

Sign-off is a state administrative scheme sitting on top of VSB 14. Find the scheme name, then a person that scheme lists.

Direct answer

You need a recognised signatory when VSB 14 treats the job as a certified modification, or when your state says the change alters the vehicle description, structure, emissions, restraints or compliance. The signatory is the person your registration authority’s scheme names — a VASS signatory in Victoria, an Approved Person in Queensland, a VSCCS certifier in New South Wales, or the local equivalent. This site will not publish a ranked list of commercial engineers.

Find the scheme before you find a person

Open the state rules article for the plates on the car. The agency page is where the scheme is named and, in many cases, where a searchable register sits. If you cannot find a register, telephone the agency and ask how they want the public to identify a current signatory. A social-media recommendation is not that register.

The Commonwealth is explicit that administration of signatories is local. A stamp that is gold in one state can be unread in another until the gaining agency says otherwise.

What to send on the first email

Send the VIN, date of manufacture, GVM, current engine and body description, the state of registration, and a one-sentence description of the intended change. Attach photographs of the car as it sits today and a list of parts you have not yet bought. Ask which VSB 14 section they will use, whether a modification plate will be required, and whether the registry will want a description change on the same job. Ask what they refuse to certify. A good signatory will decline a job that cannot be made compliant. That refusal is information, not an insult.

Do not ask them to “make it legal” after the car is already cut. Retrospective certification is sometimes possible and often more expensive in time and metal. The bulletin is written for work designed to the code, not for work designed to a mood board.

What a certificate is

A certificate is evidence that a recognised person assessed the described modification against the cited code. It is not insurance. It is not a warranty. It is not a promise that a later roadworthy will ignore new defects. If you change the car again, the certificate may no longer describe the vehicle.

Photograph the plate, keep the paper, and keep the invoice. Buyers and insurers ask for the pack.

What this publisher will not do

We will not name a workshop. We will not invent a fee. We will not guess a turnaround time. We will not tell you that a particular inspector “always wants” a second test. Those claims go stale and they are not ours to make.

If you want editorial correspondence about a citation, use contact. If you want a legal outcome, use the agency and a signatory the agency lists.

Check with your state regulator or the signatory they recognise before you fabricate. This guide is general information.

Questions that waste a signatory’s time

“Is it legal?” with no VIN, no state and no description. “Can you sign it off on Saturday?” when the car is already cut. “My mate’s car passed.” “The seller said it was ADR.” Those emails get a short reply or none. The useful email is the one in the direct-answer section of this guide.

Questions that save a build

“Which section will you use?” “What will you not certify?” “Does the registry need a description change on the same form?” “What photographs do you want before I buy parts?” “Will a later wheel change void this certificate?” Write the answers into the build diary.

After the plate is on

The plate is evidence of a described job. Keep the car in that description. If you add a second modification, ask whether the first certificate still speaks. If you sell the car, give the buyer the pack. If an insurer asks, give them the pack. If an inspector asks, give them the pack. The pack is the point of the scheme.

VSB 14 explained, choosing a modifier or engineer, contact for citation questions only. Check with your state regulator or the signatory they recognise before you fabricate.

Building the pack as you go

Create a folder named with the VIN’s last six and the year. Drop in the VSB 14 PDFs you actually used, the state page as saved on the day, invoices, photographs, emails with the signatory, and the final certificate. That folder is the asset. The car is the other asset. Buyers pay attention to both.

If you lose the paper, ask the signatory whether they retain a copy. Do not assume the registry scanned every page.

When the signatory says no

A refusal is information. It usually means the combination cannot be made to meet the cited section, or that you asked after the metal was already wrong. Redesign, or do not do the job. Shopping for a stamp is how unsafe cars stay on the road and how schemes get harder for everyone else.

Check with your state regulator or the signatory they recognise before you fabricate.

Paying for design, not for a stamp

A useful signatory sells judgement before metal. If the first conversation is only a price for a plate, you may be buying a stamp on a job they have not scoped. Ask for the section, the exclusions, and the photographs they want. Pay for that scoping. It is cheaper than a second chassis.

Working with a workshop and a signatory at once

Give both people the same sentence. If the workshop’s purchase order and the signatory’s scope disagree, stop. Dual-track builds are how certificates describe a car that does not exist. One sentence, two copies, one finished vehicle.

After you move interstate

Take the pack to the gaining agency before you assume the plate is portable. Ask what they need. If they want a local look, book it. Arguing that “it was legal in the last state” is a conversation they have heard. Evidence wins that conversation. Volume does not.

Related: VSB 14 explained, legal modifications. Check with your state regulator or the signatory they recognise before you fabricate. This guide does not certify a vehicle and does not name commercial engineers.

A closing sequence

  1. Identify the scheme on the state page. 2. Find a current person on that scheme’s register. 3. Send VIN, state, the one-sentence change, and photographs of the car now. 4. Write their section and exclusions into the workshop order. 5. Fabricate to that sentence. 6. Photograph the plate and keep the pack. 7. If you modify again or move interstate, reopen the pack before you assume it still speaks.

That sequence is the entire product of this guide. There is no ranked directory at the end of it. There is no fee. There is no claimed turnaround. Those omissions are the quality bar.

If you came here from contact, remember that the editorial inbox cannot replace step two. If you came here from a forum thread that named a shop, replace that name with the register. If you came here after the car was already cut, say so in the first email — retrospective work is a different conversation and sometimes a different outcome.

Check with your state regulator or the signatory they recognise before you fabricate. This guide does not certify a vehicle.

Why this site will stay useless as a directory

A directory of names goes stale, invites ranking theatre, and republishes the thing the old automotive-directory path used to be. The honest replacement is a method: scheme, register, scoped email, shared sentence, pack. If that feels less convenient than a list of mobile numbers, it is still the only method that stays true after a signatory retires or a scheme is renamed.

Use automotive-directory for the same method in heritage-URL form. Use contact only for citations. Use the state page for the register.

Check with your state regulator or the signatory they recognise before you fabricate. A refusal is information. A stamp without a scope is a risk. The pack is the asset you keep after the plate is on.

One more pack check

Before you sell, move, or book a later inspection, open the folder and ask whether the car still matches the sentence on the certificate. If it does not, you need a new conversation with the scheme — not a hope that nobody will notice. Check with your state regulator or the signatory they recognise before you fabricate or present the vehicle.

Last word

Scheme, register, scoped sentence, shared order, pack. That is the whole pathway. Everything else on this page exists to stop a ranked directory from coming back. Check with your state regulator or the signatory they recognise before you fabricate, and again if the car stops matching the certificate.

Keep the pack with the car.

Check the rule before you buy the part

If a change affects structure, emissions, lighting, tyres or the vehicle description on the register, stop and read VSB 14 plus your state agency. We can point you at the primary page — we cannot sign the car off.

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