After years of designing and building homes on the Gold Coast, these are the most common and costly mistakes.
Construction cost ≠ total cost. Add design ($8K-$15K), engineering ($5K-$10K), council ($5K-$10K), infrastructure charges ($28K-$40K), site works ($10K-$80K+), connections ($5K-$15K), landscaping ($10K-$50K), AC ($8K-$20K), fencing ($5K-$15K). Plus 10% contingency. See our complete guide to custom home building costs.
Cheapest block isn’t cheapest to build on. Slopes, flood overlays, bushfire, rock, poor soil, no sewer all dramatically increase cost. Have a designer assess before buying. See our guide on building on a sloping block.
Designing without a contour/boundary survey ($800-$2,000) risks positioning over easements, wrong setbacks, ignoring actual slope. Get the survey first.
Most impactful single design decision. Living areas face north. Bedrooms south or east. Minimise west-facing glass. Costs nothing to get right, expensive to fix later. See our guide on sustainable home design for passive design principles.
Signing with a builder on a “rough estimate” = weak position. Complete design and get approved plans before approaching builders for competitive quotes. Understand what construction-informed design delivers.
Most common blowout. Flat serviced block: $15K-$25K. Sloping block with rock and no services: $150K+. Get geotech report before finalising budget.
Moving a power point: $200-$500. Moving a wall: $5K-$15K. Changing kitchen layout: $10K-$30K. Plus delays. Invest in design phase to avoid construction changes.
Highest impact on daily living and resale. Cheap tapware fails in 2 years. Insufficient bench space frustrates daily cooking. Allocate 15-20% of construction budget here. See our guides on kitchen design and bathroom design trends.
Design primarily for your lifestyle, but consider broad market appeal. Always build 4+ bedrooms, double garage, good street presentation, two living areas.
Check: what’s included/excluded, allowances vs selections, variation process, defect rectification, completion date, warranty period. Consider solicitor review ($500-$1,500). Verify your builder’s QBCC licence.
Most mistakes are preventable with proper planning, realistic budgeting, and good professional advice from the start. Investing in design and documentation upfront saves multiples during construction.
Design Science helps avoid these mistakes through thorough design, realistic budgeting, and construction-informed documentation. Book a $280 consultation to start your custom home or renovation project the right way.
David Steadman
Licensed Builder & Building Designer
David Steadman is the founder of Design Science, a Gold Coast building design practice backed by over 30 years of hands-on construction experience. One of few Australians holding both a QBCC Builder's Licence and Building Designer licence, David brings a rare combination of design thinking and practical building knowledge to every project.
