Smart Budgeting for Your Build: What to Know Before You Start
Putting together a budget for a renovation or new build can feel a bit like trying to hit a moving target. Costs shift, surprises pop up, and “ballpark figures” can send you way off course. Here’s a practical, down‑to‑earth guide to help you plan with confidence.
Skip the Ballpark Figures
A “ballpark” is huge — which means the number you’re given could be miles away from the real cost. Square‑metre rates and rough estimates don’t account for the unique details of your site, your home, or your design. They’re a starting point, not a budget.
If you want accuracy, you need detail.
Budget for Every Stage — Not Just What You See Above Ground
A build isn’t just bricks, timber, and tiles. There are several stages that all need to be factored into your budget.
01 — Financing & Purchase Costs
Think of these as the “before we even start” expenses:
- Stamp duty
- Legal fees
- Loan application fees
- Insurance
- Land and water rates
- Rent or temporary accommodation during construction
02 — Planning
This is where your ideas become drawings and approvals:
- Drafting or architectural fees
- Development Application (DA) fees
03 — Pre‑Construction
All the behind‑the‑scenes essentials:
- Additional council requirements
- Long Service Levy
- Engineering reports
- Surveying
- Certifier fees
- On‑site service connections
04 — Construction
Watch your home take shape as the build progresses through each stage. This includes everything ABOVE and BELOW ground:
- Site costs
- What goes below ground to support your build is as important as what goes above and sometimes gets overlooked in budgets
- What goes above ground, the pretty stuff that most people get carried away with and usually want to spend 100% of their budget on
05 — Post‑Construction
Final inspections, handover, and settling into your new home but there could still be some oft forgotten items when budgeting — but they matter:
- Landscaping
- Fencing and gates
- Driveways and paths
Extras, Variations & Upgrades Add Up Quickly
Any time you change what’s on the plans, the cost changes too. Here’s what can impact your budget:
- Upgrades
Choosing a more expensive product than what was quoted.
Example: Upgrading from a 900mm vanity to a 1200mm. - Unforeseen Work
Things no one can see until the job starts.
Example: Extra excavation or structural repairs to meet engineering requirements. - Changes During Construction
Altering something once work has begun.
Example: Changing paint colours after painting has started.
- Additional Requests
Anything outside the original scope.
Example: Adding extra power points or lights not shown on the plans.
A Few Extra Tips
- A first floor extension costs approximately 45-53% (as at 2026) more than a comparable ground floor extension.
- Extensions can sometimes cost more than building new — it depends on the existing structure, site access, excavation needs, and footing requirements.
- Don’t stretch your budget to the limit before you begin. Always allow a buffer for the unexpected.
Need Help Planning Your Renovation?
If you’d like guidance on budgeting, planning, or understanding what’s involved in your build, we’re here to help.
Call us on 0409 129 840 to book an appointment and chat about your project or Contact us via our website.
