Home Extension vs Moving House: Cost Comparison
When a family outgrows its home, the instinct is to start scrolling property listings. But moving carries large, often-underestimated costs that buy you nothing physical. Extending your current home is frequently the smarter financial move — this guide compares the two for Melbourne in 2026.
Every situation is different, and the numbers below are illustrative. Use them to frame the decision, then get precise figures from a conveyancer and a fixed-price extension quote.
The true cost of moving
The sticker price of your next home is only the start. The transaction costs of moving are substantial and, unlike a renovation, they don't add a single square metre to your living space.
- Stamp duty (land transfer duty) — typically the largest cost, running well into the tens of thousands on a family home. Check the current rate with the State Revenue Office.
- Selling agent's commission and marketing.
- Conveyancing and legal fees on both the sale and purchase.
- Removalists, cleaning and connection fees.
- The intangible cost: new schools, new commute, leaving a community you like.
The cost of extending
Home extensions in Melbourne generally run from about $1,800 per square metre for a straightforward single-storey addition, up to $4,500+ per square metre for complex or high-spec work. A ground-floor family-room extension, a second storey or a granny flat each sit at different points on that scale.
Crucially, that spend stays with you — it becomes extra bedrooms, a bigger kitchen or a second living area, and it adds to the value of a home you already like.
When extending wins
- You like your location, street, schools and neighbours.
- Your block has room to build out or up.
- The gap between your needs and your home is a room or two, not a whole different lifestyle.
- Comparable larger homes nearby cost far more than the extension would.
When moving wins
- You need a fundamentally different location (work, schools, family).
- Your block genuinely can't accommodate what you need.
- The finished value of the extended home would exceed the ceiling price for your street.
A simple way to decide
Add up the full cost of moving — stamp duty, agent fees, legals and removalists — and treat that as your "do nothing but relocate" number. Then get a fixed-price extension quote for the space you actually need. Very often the extension costs less than the transaction costs of moving alone, and you end up with more house instead of just a different one.
Key Takeaways
- Moving costs — led by stamp duty — can run into the tens of thousands and add no living space.
- Extensions generally cost $1,800–$4,500+ per square metre and stay with you as usable space and value.
- Extend when you love the location and just need more room; move when you need a different lifestyle.
- Compare the full cost of moving against a fixed-price extension quote before deciding.
This guide is general information for Melbourne homeowners, not legal or financial advice. Costs are indicative and vary by project. Always confirm permit and compliance requirements with your council, a registered building surveyor, or the Building and Plumbing Commission before starting work.