How to Handle Construction Variations in NSW Without the Drama

Variations are inevitable. A client wants to upgrade their kitchen. The engineer requires additional piers. Council conditions change the driveway design. What matters isn't whether variations happen. It's how you manage them.

Poorly handled variations are the number-one cause of builder-client disputes in NSW. This guide covers how to get them right.

What Counts as a Variation in NSW?

Under the Home Building Act 1989, a variation is any change to the work described in the original contract. This includes:

• Additions. Extra work not in the original scope
• Omissions. Removing work from the original scope
• Substitutions. Changing specified materials or finishes
• Design changes. Alterations to plans or specifications

The Legal Requirements

Written Agreement

NSW law requires all variations to be in writing and signed by both parties before the work is carried out. Verbal agreements aren't enforceable, and doing variation work without written approval puts your payment at risk.

HIA Contract Variation Clause

If you're using an HIA contract, Clause 17 covers variations. Key requirements:

1. Written notice describing the variation
2. Price and time impact clearly stated
3. Client's written acceptance before work proceeds
4. Reasonable pricing based on agreed rates or quotes

Progress Payment Impact

Variations can affect progress payment stages. If a variation changes the contract price, the adjusted amount must be reflected in subsequent claims.

Best Practice Workflow

Step 1: Document the Need

Before discussing cost, document why the variation is needed:

• Client request (get it in writing (even an email counts)
• Site condition discovery (photos are critical)
• Council or engineer requirement (attach the relevant document)

Step 2: Price It Properly

Include:

• Labour costs (with realistic hours)
• Material costs (with supplier quotes where possible)
• Margin (transparent and fair)
• Time impact (days added to program)
• Any consequential impacts on other trades

Step 3: Present Clearly

The client should understand in plain English:

• What's changing
• Why it's changing
• How much it costs
• How long it adds
• What happens if they decline

Step 4: Get Written Approval

No grey areas. The client signs before work starts. Digital signatures are legally valid in Australia under the Electronic Transactions Act 1999.

Step 5: Track and Invoice

Add the variation to your project tracker. Invoice it at the appropriate progress stage or as a standalone claim, whatever your contract specifies.

Common Mistakes

1. Doing the work first, paperwork later. You lose leverage and legal standing
2. Verbal agreements. "But you said yes on site" won't hold up
3. Bundling variations. Issue each one separately for clarity
4. Underpricing. Include your margin. You're running a business
5. Forgetting the time impact. Cost isn't the only factor. Delays cost money too

The Digital Advantage

Paper-based variation management is slow and error-prone. Digital tools let you:

• Create and price variations in minutes, not hours
• Send for digital signature on the spot
• Track approval status across all projects
• Automatically link to the relevant contract and project
• Generate a complete audit trail for disputes

Paperless handles this entire workflow. Draft a variation, send for digital signature, track approval status, and automatically file to the project record, all from your phone. Start a free 30-day trial and try it on your next variation.