How Much Should My Renovation Cost?
- 360 Design Studio
- Apr 8, 2022
- 6 min read
Updated: Feb 1
We often get asked this question in our very first meeting. Understandably, clients need a starting point on which to base their renovation budget, and which rooms/spaces to spend it on to maximise functionality and their property value.
As a diploma-qualified interior designer and Design Institute of Australia member with 24 years of financial and project management experience, I've developed systematic approaches to renovation budgeting that prevent over-capitalisation whilst delivering beautiful, functional results.
This guide provides practical budgeting frameworks for residential renovations.
Step 1: Research Your Market
Before setting any budget, understand your property context:
A good first step is to do an online search of properties for sale that are similar to yours and in your neighbouring suburbs.
Make a note of two things:
1. Average asking prices:
Similar bedroom/bathroom configuration
Similar land size
Similar location quality
Recent sales (last 3-6 months)
2. Fittings and finishes used:
Are they basic, mid-range, or luxury/high-end?
What features appear in all properties?
What premium features command higher prices?
What's considered standard for your area?
Why this research matters:
This is a useful exercise as it will give you a very clear idea of the features that buyers in your area will pay a premium for, and therefore how and where you should spend your renovation budget to get maximum bang for your buck.
Example research findings:
In premium suburb:
Stone benchtops standard
High-end appliances expected
Underfloor heating common
Multiple bathrooms with quality fixtures
In mid-range suburb:
Laminate benchtops acceptable
Standard appliances sufficient
Basic heating adequate
Single updated bathroom priority
Understanding your market prevents over-capitalising (spending more than buyers will pay) or under-delivering (missing expected features).
Step 2: Determine Your Property Value
The next step is to do a search of your own property on real estate websites to find its estimated market value.
Resources for property valuation:
Online estimates:
Domain.com.au property reports
Realestate.com.au price estimates
CoreLogic property data
OnTheHouse valuations
Professional valuations:
Real estate agent appraisals (often free)
Professional valuer reports ($300-600)
Recent comparable sales
Use conservative estimates: If range is $1.1m-1.3m, use lower figure ($1.1m) for renovation budgeting to avoid over-capitalisation risk.
The 10% Rule: Your Renovation Budget Framework
A good rule of thumb is to limit your renovation budget to 10% of the estimated market value (this would only apply if you are updating the property without making significant structural changes like adding new rooms).
Why 10%?
Prevents over-capitalisation:
Spending more on renovation than buyers will pay in your area
Example: $100k bathroom in $800k house won't return investment
Maintains value proposition:
Property remains competitive in market segment
Doesn't price out of neighbourhood
Provides appropriate quality level
Ensures profitability (if renovating to sell):
Renovation costs + purchase price < resale value
Adequate margin for agent fees and selling costs
Important: This is a guideline for cosmetic renovations. Structural changes (extensions, additions, major reconfigurations) typically require 20-40%+ of property value.
Room-by-Room Budget Allocation
For a typical 3-4 bedroom, 2 bathroom house:
Using the 10% total budget, allocate as follows:
Room/Area | % of Total Budget |
Kitchen | 20% |
Main bathroom | 20% |
External (façade, gardens, fencing) | 20% |
Lounge, living, dining | 10% |
Bedrooms | 10% |
Contingency | 10% |
Hallway | 4% |
Second bathroom | 3% |
Laundry | 3% |
TOTAL | 100% |
Why this allocation?
Kitchen (20%): Highest impact on property value and buyer appeal
Main bathroom (20%): Second-highest priority for buyers
External (20%): First impression and kerb appeal critical
Contingency (10%): Unexpected discoveries common in renovations
Worked Example: $1.2 Million Property
Property value: $1,200,000
Total renovation budget: $120,000 (10% x $1.2m)
Room-by-room allocation:
Room/Area | Budget | What This Buys |
Kitchen | $24,000 | Mid-range benchtops, quality appliances, cabinet refresh or replacement, new splashback |
Main bathroom | $24,000 | Full renovation with mid-range tiles, new fixtures, quality tapware, improved layout |
External | $24,000 | Façade paint, landscaping, fencing repairs, kerb appeal improvements |
Lounge/living/dining | $12,000 | Fresh paint, new flooring, updated lighting, window treatments |
Bedrooms | $12,000 | Paint, new carpets or flooring, built-in wardrobes if needed, lighting updates |
Contingency | $12,000 | Buffer for unexpected issues, scope additions, or cost overruns |
Hallway | $4,800 | Paint, flooring, lighting |
Second bathroom | $3,600 | Cosmetic updates (paint, fixtures, accessories) rather than full renovation |
Laundry | $3,600 | Updated benchtop, storage, splashback, fixtures |
Total | $120,000 |
Simplified formula: Aim to spend no more than 2% of market value on each "big-ticket" space (kitchen, main bathroom, external areas).
Understanding Fixed vs. Variable Costs
Why this matters for budgeting:
Labour costs are largely "fixed":
A tiler will charge the same rate whether he is using $19 or $90 tiles in your bathroom. This is because tradespeople charge for their time and expertise, not material cost.
Materials are variable:
This is where your budget allocation makes the biggest difference. Same labour cost, vastly different material costs.
Strategic implications:
Invest in quality where it matters:
Benchtops (high-use, high-visibility)
Flooring (durability critical)
Tapware (daily use, quality affects longevity)
Economise where appropriate:
Wall tiles behind furniture (not visible)
Less-used bathrooms
Temporary solutions for future phases
At 360 Design Studio, we provide services to deliver on all three components of a successful renovation: form (how well the renovated space looks), functionality (how well it meets your needs), and financial management (keeping the project within your budget).
My 24 years of financial and project management experience enables me to strategically allocate budgets, maximise value from every dollar, and identify where to invest versus economise.
Avoiding Over-Capitalisation
What is over-capitalisation?
Spending more on renovation than what a buyer would pay for a similar property in the same area.
Example of over-capitalisation:
Property value: $1,000,000
Main bathroom renovation: $100,000 (marble tiles, high-end fixtures, heated floors)
Total property value: $1,000,000 + $100,000 = $1,100,000
Market reality: Buyers in this area expect $20,000-30,000 bathrooms with mid-range finishes. They won't pay $1,100,000 for your property when comparable properties with appropriate bathrooms sell for $1,050,000.
You've lost $50,000-80,000 through over-capitalisation.
How to prevent over-capitalisation:
1. Research comparable properties (Step 1):
Understand what's standard vs premium in your area
Note which features command price premiums
Observe what doesn't increase value
2. Follow the 10% rule:
Total budget no more than 10% of property value
No single room more than 2% of property value
3. Work with qualified designer:
Professional understanding of value-adding renovations
Experience with what sells in different markets
Objective advice on appropriate quality levels
My Design Institute of Australia membership and diploma qualification ensure I understand property markets, value-adding renovations, and appropriate quality levels for different property segments.
When to Exceed the 10% Rule
The 10% guideline doesn't apply when:
1. Structural changes:
Adding rooms or extensions
Major reconfigurations
Building second storey
Budget typically: 20-40%+ of property value
2. Renovating to keep long-term:
Your forever home
Not concerned with immediate resale value
Personal preferences prioritised over market expectations
3. Renovating high-value properties:
Luxury properties may require <10% for quality updates
Market expectations may demand specific features
4. Renovating seriously dated properties:
Property significantly below market standard
Strategic renovation can increase value >10% investment
Requires careful analysis and professional advice
5. Subdividing or developing:
Different financial calculations apply
Developer-level returns expected
Professional feasibility studies required
Budget Components Often Forgotten
Don't forget to budget for:
1. Design fees (10-15% of construction cost):
Qualified designer fees
3D visualisations
Technical documentation
Building code compliance verification
2. Approvals and permits (2-5%):
Council applications
Private certification
Engineering reports if needed
Strata approvals for apartments
3. Temporary accommodation/storage:
If vacating during major works
Storage for furniture and belongings
4. Professional photography:
If renovating to sell
Professional styling
Marketing materials
5. Contingency (10-15%):
Unexpected structural discoveries
Material price increases
Scope additions
Problem resolution
At 360 Design Studio, we charge fixed fees based on project complexity, providing budget certainty from the start. We also pass on 100% of trade discounts we receive, adding back to your renovation budget.
Phasing Your Renovation
If budget doesn't allow everything at once:
Phase 1 (highest impact):
Kitchen
Main bathroom
External kerb appeal
Phase 2 (important but lower priority):
Living areas
Main bedroom
Second bathroom
Phase 3 (when budget allows):
Guest bedrooms
Laundry
Hallway and other areas
Phasing advantages:
Manageable financial commitment
Learn from Phase 1 before proceeding
Adjust based on changing needs
Reduced stress and disruption
Phasing considerations:
Design comprehensively from start (prevents mismatched phases)
Consider sequential logistics (easier to do hallway when doing adjacent rooms)
Budget for re-establishment costs between phases
The 360 Design Studio Approach
Qualifications:
Diploma in Interior Design, Interior Design Institute (2024)
Design Institute of Australia member
Professional indemnity insurance
24 years of financial and project management experience
Co-founder, Dezinery (marketplace for recycled and reusable homewares)
Financial management expertise:
Budget development:
Market research and property analysis
Room-by-room allocation strategy
Fixed vs variable cost optimisation
Contingency planning
Cost control:
Fixed-fee design pricing (no percentage-based conflicts)
100% trade discount pass-through
Value engineering where budget tight
Realistic cost estimates preventing surprises
Sustainable budget optimisation:
Retention and refinishing opportunities (saves 30-50%)
Durable specifications reducing future costs
Energy-efficient selections reducing operating costs
Phasing strategies for manageable investment
Service areas:
Most Sydney suburbs (in-person)
Remote design services Australia-wide
The Bottom Line
Renovation budgeting requires market research understanding what's standard in your area, property valuation establishing baseline, the 10% rule preventing over-capitalisation, and room-by-room allocation maximising impact.
The most expensive renovation isn't necessarily the best. The best renovation delivers appropriate quality for your market, stays within budget, and maximises functionality and appeal.
We can work within any budget, so call us to discuss your next project.
About the Author: Vinti Verma holds a Diploma in Interior Design from the Interior Design Institute (2024) and is a member of the Design Institute of Australia. She specialises in sustainable commercial interior design and cosmetic renovations with environmental focus. As co-founder of Dezinery (Australia's marketplace for recycled and reusable homewares), she brings practical expertise in circular economy principles and sustainable material specification. Based in Sydney with remote services available Australia-wide.
Learn more: Our pricing | Interior Design services | Project Management services
Contact 360 Design Studio: Email: info@360designstudio.com.au | Phone: 0411 086 116 | Web: www.360designstudio.com.au
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