Common Contract Amendments and How to Request Them

Yes, absolutely. All contract amendments must be documented in writing and signed by both parties to be legally enforceable. Verbal agreements or informal communications such as text messages or casual emails do not constitute valid contract amendments and create significant ambiguity if disputes arise. A formal written amendment should reference the original contract, specify the exact changes, detail the impact on price and timeline, and be signed and dated by both parties.

Your builder can only charge for additional work if you have agreed to a formal contract amendment in writing before the varied work commences. The variation must specify the exact scope of additional work, provide an itemised cost breakdown including labour and materials, state the impact on the completion date, and be signed by you before the builder purchases materials or commences the varied work. If your builder performs work outside the original contract scope without a signed written variation, you may not be obligated to pay for that work.

You are not obligated to agree to any contract amendment unless you choose to do so. If your builder requests an amendment such as a time extension or price increase and you refuse, the builder remains bound by the original contract terms. However, if the amendment is necessary due to circumstances beyond the builder's control (such as extreme weather or client-requested design changes), refusing the amendment may have consequences. It's important to assess each amendment request carefully, understand your legal position, and seek legal advice if you're uncertain about whether to agree.

A fair and reasonable contract amendment should be proportionate to the change in circumstances, supported by documentation such as quotes or invoices, consistent with market rates for the varied work, clearly specify all changes to price, scope, and timeline, and include sufficient detail to prevent ambiguity. If your builder requests a significant price increase or time extension, request detailed justification including breakdowns of costs, evidence of the need for the variation, and comparison quotes where appropriate. If you're uncertain whether an amendment is reasonable, seek specialist construction law advice before signing.

Yes, you can request contract amendments at any stage of the project, including after work has commenced. Common reasons for homeowner-initiated amendments include design changes, upgraded materials or fixtures, additions to the scope of work, or changes in project priorities. However, amendments requested after work has started may be more costly and cause greater delays than changes made before construction begins. Always request amendments in writing, obtain a detailed quote before agreeing, and ensure the amendment is signed by both parties before any varied work proceeds.

If your builder commences varied work without a signed written amendment, immediately notify the builder in writing to stop the varied work until a formal amendment is agreed and signed. Document the unauthorised work with photographs and written records, and confirm in writing that you have not agreed to the variation or any associated price increase. Do not make any payments for unauthorised varied work. If the builder refuses to stop or demands payment for work you didn't authorise, seek legal advice immediately.

Yes, seeking legal advice before signing significant contract amendments is highly recommended, particularly for amendments involving substantial price increases (over $5,000–$10,000), significant delays to the completion date, changes to warranty provisions or dispute resolution clauses, or amendments where you're uncertain about the fairness or necessity of the change. A construction lawyer can review the amendment, advise on your legal rights and obligations, identify unfair terms or unreasonable costs, and ensure the amendment is properly documented and enforceable.