Running a Steel Fabrication Business in Australia
The structural engineer revises the drawing. Again. Beam size changed from 310UB to 360UB. You've already cut and welded four 310UBs. They're scrap. The revision creates a material cost variation you could have priced for if the drawing had been finalised before you started cutting. But it wasn't, and now you're having the conversation about who pays for the steel that's sitting on your workshop floor. This is the steel fabrication business.
What a steel fabrication business looks like
What steel fabricators actually deal with
Drawing revisions after cutting — the remake cost problem
Construction drawings go through multiple revisions. Structural engineers update calculations. Architects change dimensions. Builders make site decisions that affect steelwork. In a well-run project, all revisions are finalised before fabrication starts. In reality, revisions often come in while cutting is already underway.
The protection is drawing version control in every quote: "Fabrication based on drawings revision [X] dated [date]. Any change to an approved drawing after fabrication commencement is a variation priced at current material and labour rates. Material already fabricated to superseded drawings is chargeable as waste or returned stock."
When a revision arrives, stop cutting, notify the client immediately, confirm the variation cost in writing, and only proceed on the new drawings once the variation is approved. Fabricating to superseded drawings without a variation creates waste costs you can't recover.
Materials deposit — funding the project from your own working capital
Steel stock is one of the most capital-intensive material costs in the trades. A commercial steel package can represent $20,000–$40,000 of raw material cost. Ordering stock without a deposit means funding the entire material cost from your working capital before any payment has been received — effectively lending the client their project costs interest-free.
50% deposit before any steel is ordered. This is standard practice in fabrication and no legitimate commercial client will refuse it. Clients who push back on a material deposit before procurement are asking you to take on a financial risk that belongs to them.
Site measure vs drawing discrepancy on installation day
Fabricated steel is manufactured to drawing dimensions. Building sites are built to approximate dimensions. The gap between "drawing says 6.2m" and "site measures 6.3m" creates a 100mm problem that requires either site adjustment or workshop modification. The most expensive way to discover this is on installation day when the steel doesn't fit. A site measure before fabrication — confirming critical dimensions match the approved drawings — catches these discrepancies before they become costly.
Where fabrication margin disappears
| Stage | What You Need | What's Actually Happening |
|---|---|---|
| Quoting | Quote against a specific approved drawing revision number. Drawing version control clause in every quote. Material deposit required before procurement. Site measure confirmation before cutting starts. | Quote against current drawings without version reference. Revision comes in after cutting. No variation basis. Remake cost absorbed. |
| Job Management | Fabrication milestone tracking. Revision notification to client immediately on receipt. Material usage recorded per job. Install day site measure confirmation before delivery. | Revision received, cutting continues. Site measure not done. Steel delivered, doesn't fit. Costly modification on-site. |
| Invoicing | Progress billing: deposit on order, fabrication complete milestone, delivery/install. Variation for drawing changes before proceeding. 45-day commercial terms factored into cashflow plan. | Single invoice at project completion. Drawing variation not invoiced. 60-day commercial terms not planned for. |
| Payments | 50% deposit before material order. Progress payment before delivery. Balance on installation completion. Commercial client 45–60 day terms bridged by line of credit. | Full amount at completion. Large material float on operator credit. Interest costs absorbed. |
What steel fabrication businesses actually need
Tradify or simPRO for project milestone tracking, drawing version notes, material usage per job, and variation creation at the point of drawing revision receipt. Progress billing milestones set at project start and invoiced on trigger.
Compare job management tools →Steel fabrication requires significant workshop equipment: welders, plasma cutters, presses, overhead cranes. Equipment finance preserves working capital for materials and operations. Chattel mortgage provides the best tax treatment for workshop equipment in most circumstances.
Compare equipment finance →Even with a 50% deposit, the timing between deposit receipt and materials procurement vs fabrication time vs delivery vs invoice payment creates a float requirement. A business line of credit sized to your average materials float eliminates the working capital squeeze.
Compare finance options →Absorbing remake costs from drawing revisions and funding steel from your own pocket?
The Strategy Builder identifies the contract, cashflow, and variation capture gaps in your steel fabrication business.
Build My Free Strategy →Frequently Asked Questions
Quote against a specific approved drawing revision number, and include in every quote: "Fabrication based on drawings revision [X] dated [date]. Any design change after fabrication commencement is a variation." When a revision arrives after cutting starts, stop, notify the client, confirm the variation cost, and only proceed once it's approved. Never fabricate to superseded drawings without an approved variation.
Before any steel is ordered — 50% minimum. Steel material costs represent 40–60% of a fabrication job's total value. Ordering stock without a deposit means funding the project from your working capital before any payment is received. Legitimate commercial clients don't refuse a material deposit. Those who do are asking you to take on their financing risk.
Progress billing tied to fabrication milestones: deposit on order confirmation, progress payment on completion of fabrication before delivery, balance on final installation. Each delivery stage has a corresponding invoice milestone. Never deliver fabricated steel to site with 100% of the value unpaid — once it's on their site, your leverage to collect disappears.