How to Budget for a Home Renovation in Australia (2026)
Renovation budgets in Australia routinely blow out by 20–50% above initial estimates. Understanding where the costs come from — and how to plan for the unexpected — is as important as choosing the right finance.
Step 1 — Define the Scope Before Getting Quotes
Before approaching builders or tradespeople, document exactly what you want:
- Rough plans or floor plan sketch (for structural work)
- List of fixtures and finishes you want (kitchen benchtop material, tap brand, tile type)
- Timeline expectations
- Whether you need council approval (and whether you have it)
Vague scopes produce wildly inconsistent quotes. A kitchen renovation with “something mid-range” will generate quotes ranging from $15,000 to $80,000 from different builders — because they are quoting entirely different standards.
Step 2 — Get Multiple Quotes
The general guidance in the Australian building industry:
- Get at least three quotes for any project over $5,000
- Ensure all quotes cover the same scope — compare like for like
- Request quotes from licensed builders or tradespeople (check licence status via your state’s building authority)
Warning signs of underquoting:
- Quote significantly below all others (often a sign of hidden extras to come)
- Vague contract terms (“approximately” costs)
- Requests for large upfront deposits (>5–10% before work starts is unusual and risky)
Step 3 — Understand What the Quote Includes (and What It Doesn’t)
Most renovation quotes cover the structural scope — they often exclude:
| Typically excluded from builder quotes | Estimated cost |
|---|---|
| Appliances (oven, dishwasher, rangehood) | $2,000–$15,000 |
| Window furnishings (blinds, curtains) | $1,500–$8,000 |
| Landscaping and outdoor paving | $5,000–$40,000+ |
| Furniture (for extensions) | $3,000–$20,000 |
| Decorating (artwork, soft furnishings) | Variable |
| Temporary accommodation during build | $2,000–$10,000/month |
| Moving and storage costs | $500–$3,000 |
| Council approval fees | $500–$3,000+ |
| Architect / draftsman fees | $3,000–$15,000+ |
| Site inspections and certifications | $500–$2,000 |
Step 4 — Build in a Contingency
The standard rule: always add 10–20% contingency on top of the builder’s quote.
Structural renovations carry higher contingency requirements. When walls open up, hidden issues are commonly found:
- Subfloor rot or termite damage
- Asbestos in older homes (pre-1990) — licensed removal required
- Outdated electrical wiring requiring full replacement
- Substandard prior renovation work that must be rectified
- Unexpected soil conditions (for extensions requiring new footings)
A $100,000 renovation quote: plan for $115,000–$120,000 minimum.
Typical Renovation Costs by Room (Australia, 2026)
| Room / project | Budget range | What it includes |
|---|---|---|
| Bathroom renovation (basic) | $15,000–$25,000 | New fixtures, tiles, vanity; retain layout |
| Bathroom renovation (premium) | $25,000–$50,000+ | Full refit, repositioned plumbing, premium tiles |
| Kitchen renovation (basic) | $15,000–$30,000 | New cabinetry, benchtop, taps, appliances |
| Kitchen renovation (premium) | $40,000–$80,000+ | Full structural, stone benchtops, integrated appliances |
| Bedroom addition (to existing house) | $60,000–$120,000+ | Extension, permits, fully fitted |
| Second storey addition | $200,000–$600,000+ | Major structural; full second floor |
| Deck / alfresco (hardwood or composite) | $15,000–$50,000 | Size, material, roofing varies widely |
| Full house repaint (exterior) | $8,000–$25,000 | Prep, undercoat, two coats |
| New flooring (whole house) | $8,000–$30,000 | Hardwood, engineered timber, or carpet |
Costs are indicative ranges based on industry data. Quotes vary significantly by state, postcode, materials, and builder.
Step 5 — Track Spending During the Renovation
Once work begins, variations (changes to the original scope) are the primary driver of budget overrun. Best practices:
- Document all variations in writing before the work is done — get a variation form signed by both parties
- Agree on variation costs upfront — not after the work is complete
- Track cumulative variations against your contingency budget weekly
- Stop the work and reassess if cumulative variations are approaching your contingency ceiling
Council Approval Costs
If your renovation requires a Development Application (DA) or Complying Development Certificate (CDC):
| Cost | Typical range |
|---|---|
| Architect or draftsman (plans) | $3,000–$15,000 |
| DA application fee (council) | $500–$5,000+ (depending on project value and council) |
| Certifier / principal certifying authority | $1,500–$5,000 |
| Construction certificate | Included in certifier fee or separate |
Planning approval timelines:
- CDC (complying development): 10–20 business days
- DA (development application): 40–120 days at most councils (can be longer for complex projects)
Budget for approval time in your project timeline — delays in approval delay your builder start date.
Frequently Asked Questions
Should I renovate before or after moving in?
Renovating before moving in avoids displacement costs (temporary accommodation, storage) and allows faster completion without coordinating around occupants. However, it requires bridging finance or access to funds before the sale of an existing property. Many buyers factor renovation costs into their purchase budget and renovate on a targeted timeline post-purchase.
How do I know if I am overcapitalising?
Research comparable sales (renovated vs unrenovated) in your suburb on Domain or realestate.com.au. Estimate the post-renovation value. If renovation cost > increase in property value, you are overcapitalising (spending more than the market will reward). This doesn’t mean don’t renovate — but it means the return is lifestyle/enjoyment rather than financial.
What is the most cost-effective renovation for resale value?
Generally: kitchens and bathrooms have the strongest impact on buyer perception (and sale price). Fresh paint and new flooring have the highest presentation impact per dollar. Pools and extensions are more speculative in terms of value return.
Related Renovation Guides
- Home Renovation Loans Australia — Your Finance Options
- Personal Loan vs Home Equity for Renovation
- Renovation Construction Loan — How It Works
- Buying a Fixer-Upper in Australia
- Renovation Finance Hub
This article provides general information about home renovation budgeting in Australia. Costs are indicative and vary by location, materials, and trades availability. For finance advice, speak with a licensed mortgage broker. Find one through MoneySmart.