A builder’s quote covers construction. It does not cover the project. On a knockdown rebuild in Melbourne’s eastern suburbs, the costs that sit outside the building contract — design, consultants, surveys, approvals, demolition, service abolishment, landscaping and variations — regularly add six figures to the total.
Most homeowners we speak with have budgeted carefully for the build itself. Far fewer have a clear picture of what sits outside it. That gap is one of the most common reasons a project that looked comfortable at concept stage becomes difficult twelve months later.
What a Building Contract Actually Covers
A domestic building contract covers the construction of the home as documented. It is priced against a specific set of drawings, specifications and inclusions, at a specific point in time. Anything not in those documents is not in the price.
That is not a loophole. It is how fixed-price contracting works, and it is what allows a builder to hold a price at all. But it does mean the number you compare between builders is narrower than the amount you will actually spend to get into the house.
The Pre-Construction Costs Most Homeowners Underestimate
Before a single wall goes up, a knockdown rebuild carries a set of design, consultant, approval and demolition costs. These are paid to third parties — designers, engineers, surveyors, councils and authorities — not to your builder.
Across the projects we see in Melbourne’s eastern suburbs, these costs generally fall into three bands:
- Essential — $90,000 to $160,000. The basic required costs for a more straightforward knockdown rebuild.
- Complete — $160,000 to $280,000. A more realistic range for a quality rebuild with stronger consultant involvement.
- Complex — $340,000 to $770,000 and above. Architect-led, higher-end or more complex projects with a wider consultant scope.
What Sits Inside Those Numbers
For a project in the Complete band, the individual line items typically look like this:
- Design or designer — $70,000 to $100,000
- Structural engineer — $15,000 to $30,000
- Building surveyor — $15,000 to $20,000
- Council protection — $10,000 to $20,000
- Energy report — $1,500 to $3,000
- Civil — $3,000 to $6,000
- Soil report — $1,000 to $3,000
- Land survey — $3,000 to $5,000
- Performance solution — $2,000 to $10,000
- Demolition and service abolishment — $20,000 to $40,000
- Council and authority items — $10,000 to $20,000
- Contingency — $10,000 to $20,000
Site conditions move these figures. An easement, a significant fall across the block, protected or neighbouring trees, and suspected asbestos each add scope — sometimes to the consultant fees, sometimes to demolition, sometimes to both.
Two Costs That Sit Outside Almost Every Builder’s Quote
1. Landscaping
Landscaping is not included in most builders’ quotes, and it is one of the genuinely open-ended items in a residential project. The range is too wide for any single figure to be useful. A driveway, lawn and basic planting sits at one end. Pools, structural retaining, extensive paving, outdoor structures and mature planting sit at the other, and the difference between those two outcomes can run into hundreds of thousands of dollars.
The practical approach is to treat landscaping as its own budget line from the beginning, and to price it against your actual scope rather than carrying a placeholder number you have not tested.
2. Variations
A variation is any change to the contracted scope once the contract is signed — a different benchtop, a relocated window, an upgrade to joinery, or work that becomes necessary because something on site turned out differently to what was documented.
The total is different on every project, because it depends entirely on how resolved the documentation was before pricing and how much changes afterwards. Any builder who gives you a confident percentage in advance is guessing.
What can be said is that variations are the most common cause of a budget moving after signing, and the most preventable. Documentation that is properly resolved before pricing is the single most effective way to keep them down.
How the Gap Opens Up — An Illustrative Example
The following is a hypothetical project, not a real client. It is included only to show how ordinary decisions compound.
A homeowner sets a $2 million budget and receives a building contract at $1.6 million. That feels like comfortable room. Design and consultant costs then land in the Complete band at roughly $250,000. Demolition uncovers asbestos. Two protected trees require an arborist and council protection measures. During construction, joinery is upgraded and two window openings are moved, generating variations. Landscaping, never budgeted as a separate line, is quoted at $180,000.
No single item here is unreasonable, and no one has made a mistake. The budget moves because only one of those costs was ever inside the builder’s quote.
What to Ask Before You Sign
- Ask your builder in writing what is excluded from the quote, not only what is included.
- Budget pre-construction costs as a separate figure, using a realistic band rather than a best case.
- Price landscaping against your actual scope before you lock in the build budget.
- Resolve documentation as far as possible before pricing — this is where variations are prevented, not managed.
- Hold a contingency. Pre-construction alone warrants $10,000 to $20,000; the construction phase warrants its own.
- When comparing builders, confirm each quote is priced against the same drawings and the same inclusions. Otherwise you are comparing assumptions, not prices.
Final Thoughts
The point of understanding these costs is not to make a rebuild look expensive. It is to make the number you are working with real.
A homeowner who sees the full picture at the start makes better decisions about scope, design and timing than one who discovers it in stages. In our experience, the projects that run well are rarely the ones with the largest budgets. They are the ones where the budget was honest from the beginning.