How to set up a process for handling project variations

To protect your profit margins and avoid "scope creep," you must implement a formal variation process where no additional work begins until the client has signed off on a written quote that details the specific changes, the extra cost, and the impact on the project timeline.

In the construction industry, it is rare for a project to finish exactly as it was originally planned. Whether a client changes their mind about a kitchen finish or you encounter an unforeseen structural issue, these changes are known as "variations." Without a clear process, you risk doing extra work for free or ending up in a payment dispute at the end of the job.

1. Define how requests are made

The biggest mistake many contractors make is accepting verbal instructions on a busy site. To maintain control, establish a rule that all change requests must be submitted in writing—even if it's just a simple email or a message via your project management software. This creates a "paper trail" that you can refer back to if memories fade later on.

2. Assess the impact (Cost and Time)

When a variation is requested, don't just think about the materials. You need to calculate the full impact on your business, including:

• Additional Labour: How many extra hours or days will this take?
• Materials and Waste: What new materials are needed, and will there be extra skip visits?
• The "Ripple Effect": Will this change delay your subcontractors or push back the start date of your next project?
• Overheads and Profit: Ensure you apply your standard markup to the extra costs.

3. Issue a "Variation Order"

Once you have calculated the cost, present the client with a formal document (often called a Variation Order or Change Order). This doesn't need to be overly complex, but it must include:

Element	Description
Description	A clear explanation of what is being added or removed.
Financial Impact	The total extra cost (or credit) to be added to the final bill.
Schedule Impact	How many days will be added to the original completion date.

4. Get formal approval

This is the most critical step: do not start the work until the client has signed the Variation Order. In a fast-moving project, it's tempting to "just get on with it," but a signature (or a clear "I approve" via email) is your legal protection. It confirms the client understands that the original price and timeline have now changed.

Pro Tip: Include a section in your initial client contract that briefly explains this variation process. If they know from day one that "changes = written quotes + signatures," they are much less likely to be surprised when you pause work to price up an extra socket or a wall move.

5. Update your project log

Keep a running "Variation Log" (a simple spreadsheet is fine) for every project. This should track every change, the cost, and the approval date. This makes your final invoicing much easier, as you can simply attach the log and the signed orders to your final application for payment, leaving no room for argument over the total bill.