Why Choose an Extension Over Moving?
Extending your Brisbane home is often more cost-effective than selling and moving. Not only can you avoid stamp duty and relocation costs, but you also get to stay in the neighbourhood you love. A well-planned extension can also significantly increase your property’s value.
Typical Extension Costs in Brisbane
Per-Square-Metre Estimates
- Ground-floor extensions: usually $2,500 to $4,000 per m² for standard projects.
- Second-storey additions: generally cost up to 50% more due to additional structural requirements.
Example Projects
- 20–30 m² rear room: approx. $50,000–$120,000
- 40–60 m² open-plan kitchen/living area: approx. $120,000–$250,000
- Master bedroom + ensuite extension (~35 m²): approx. $30,000–$40,000
- 50 m² single-storey extension: typically $50,000–$70,000
- 50 m² second-storey expansion: approx. $70,000–$100,000
Kitchen Renovation & Extension Costs
Kitchens are one of the most valuable spaces in a home, but also among the most expensive to extend or renovate.
- Standard Brisbane kitchen renovation: $25,000 to $40,000
- Premium upgrades: $40,000 to $60,000+, depending on finishes and appliances
- Small Standard Kitchens: from $10,000–$14,000
- Large Luxury Kitchens: $45,000–$60,000+
Bathroom Renovation Costs
Bathrooms are considered “wet areas,” which means plumbing and waterproofing add significantly to the cost.
- Standard bathroom renovation: $23,000–$28,500
- Premium bathroom upgrades: $30,000–$35,000+
- Small-scale bathroom projects: start around $20,000–$27,000
Factors That Influence Extension Costs
- Size & Scope – Larger and more complex projects increase overall cost.
- Design Complexity – Custom layouts and architectural designs are more expensive than simple additions.
- Materials & Finishes – High-end finishes like stone, marble, and premium tiles raise costs.
- Wet Areas (Kitchens/Bathrooms) – Plumbing, waterproofing, and fixtures add expense.
- Site & Structural Conditions – Sloping blocks, poor foundations, or restricted access impact pricing.
- Professional Fees & Approvals – Drafting, engineering, and council approvals are necessary inclusions.
- Contingency – Always allow a budget buffer for unexpected site conditions or design changes.
Cost-Saving Strategies
- Choose single-storey rather than double-storey extensions when possible.
- Keep the design simple with fewer structural changes.
- Limit additional wet areas unless essential.
- Consider a draftsperson instead of an architect for straightforward projects.
- Request a fixed-price quote to protect against budget blowouts.
Why Work With Builder Brokers (1800 1 BUILD)?
At Builder Brokers, we take the stress out of home extensions by connecting you with trusted Brisbane builders who suit your project, budget, and timeline.
- We source multiple competitive quotes from vetted builders.
- We manage planning, approvals, and contracts to save you time.
- We ensure cost transparency and help avoid unexpected blowouts.
- Our team understands local council requirements and Brisbane’s construction landscape.
Sample Budget Summary
| Project Type | Estimated Cost (AUD) |
|---|---|
| Single-storey extension (50 m²) | $50,000 – $70,000 |
| Master bed + ensuite (~35 m²) | $30,000 – $40,000 |
| Open-plan kitchen/living (40-60 m²) | $120,000 – $250,000 |
| Kitchen renovation | $25,000 – $60,000+ |
| Bathroom renovation | $23,000 – $28,500 (standard), $35,000+ (premium) |
Extending your Brisbane home in 2025 can be a smart investment, but costs vary widely depending on scope, finishes, and site conditions. Whether you’re planning a kitchen extension, a bathroom renovation, or a full house addition, having the right builder makes all the difference.
Ready to Extend?
Talk to the experts at Builder Brokers today. Call 1800 1 BUILD to get tailored advice, competitive quotes, and a smooth path from design to completion.
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