When planning a major renovation or custom build, most homeowners focus on the big-ticket items: construction, finishes, and fixtures. But the reality is, hidden costs can quickly accumulate and derail even the most carefully planned budget. At SE Building Solutions, we believe in complete transparency and smart planning to ensure your renovation stays on track—financially and creatively.
Here are some of the most common hidden costs in large-scale renovations—and how to budget for them:
Site Preparation and Demolition
Preparing the site often involves more than demolition. Think tree removal, excavation, soil testing, or asbestos removal. These essentials are easy to underestimate but vital to a safe and compliant build.
Budget tip: Set aside a contingency of 5–10% of your total build cost to cover preliminary works that might not be obvious at the outset.
Unforeseen Structural Issues
Especially in character or Queenslander homes, surprises often lie beneath the surface—damaged subflooring, outdated wiring, termite damage, or poor drainage.
Budget tip: Allocate additional contingency for heritage or older homes where unknowns are more likely. A thorough site inspection before starting can help uncover red flags.
Council Fees and Compliance Costs
Planning approvals, building permits, heritage overlays, and consultant reports (like energy or acoustic assessments) can come with unexpected fees and extended timelines.
Budget tip: Work with a builder and architect who understand local council requirements. Budget for these early to avoid delays.
Temporary Living Arrangements
Will you need to move out during the renovation? Renting another property or storing furniture can significantly add to the total cost.
Budget tip: Consider this early in your planning. Include relocation, rent, or storage fees as a separate line item in your budget.
Design Changes Mid-Build
Changing your mind during construction—whether it’s cabinetry, layout, or finishes—can trigger rework, delays, and additional labour costs.
Budget tip: Invest time in pre-construction design planning. Work with your builder and designer to finalise every detail before breaking ground.
Upgrades and Finishes
Clients often fall in love with premium upgrades—custom joinery, stone benchtops, designer tapware—which, while stunning, can add up fast.
Budget tip: Decide upfront where you want to splurge and where to save. We help clients make selections that balance beauty and budget.
Landscaping and External Works
Driveways, fencing, retaining walls, and outdoor lighting often get left off the initial budget—but are essential to completing the look and functionality of your home.
Budget tip: Include a line item for external works in your initial cost plan so you’re not left with unfinished outdoor areas.
Planning a large-scale renovation? Let’s create a custom roadmap that anticipates the unexpected and keeps your project on time and on budget. Contact SE Building Solutions at 0415 772 983 today.