Estimate A House Construction Budget Before You Compare Quotes Or Finalise A Build Plan. Choose A Simple Area-Based Estimate, Add A Garage Or Covered Area, Build A Fuller Project Budget Or Start From A Known Base Construction Cost. Enter Your Own Rates And Allowances So The Result Reflects The Project You Are Actually Planning.
All Number Entries Start Blank With A Soft Zero Placeholder. Type Your Own Amount And The Zero Will Not Be Added In Front Of It. Results Stay Hidden Until You Press Calculate House Cost.
Choose The Option That Best Matches The Information You Already Have. The Calculator Never Inserts A Fixed National Construction Price.
Your Result Will Appear Here After You Press Calculate House Cost.
The PDF Includes The Selected Calculation Mode, Floor Area Where Available, Base Cost, Allowances, Contingency And Estimated Project Total.
Start With A Base Construction Amount, Then Add Project-Specific Allowances. Apply The Contingency To The Subtotal So The Base Cost And Extra Planning Allowance Stay Easy To Review.
The Result Separates The Base Build, Project Allowances And Contingency So Your Planning Budget Is Easier To Understand And Compare.
Use The Area That Matches The Construction Rate You Are Entering.
Enter A Builder, Estimator Or Planning Rate Instead Of A Fixed Website Price.
Keep Site, Design, Service And External Costs Visible In The Budget.
Apply A Separate Percentage To The Subtotal For Scenario Planning.
Review The Overall Project Total Against The Entered Floor Area.
Save A Clean Construction Budget Summary Generated By ConcreteCreek.com.
A House Construction Cost Estimate Is More Useful When The Main Building Cost And The Project-Specific Extras Are Kept Separate. A Square-Metre Rate Can Be A Fast Starting Point, But It Does Not Automatically Tell You What Is Included. One Estimate May Cover The Main Dwelling Only, While Another May Include A Garage, Site Works, Design Fees, Connections Or External Works.
This House Construction Cost Calculator Uses The Numbers You Enter Instead Of Inserting A Fixed National Price. That Lets You Test A Builder Estimate, A Quantity Surveyor Allowance, An Early Feasibility Rate Or Several Different Budget Scenarios Without Assuming That One Published Cost Per Square Metre Suits Every Australian Project.
Base Construction Cost = Internal Floor Area (m²) × Build Rate (A$/m²)
The Floor Area And Build Rate Need To Describe The Same Scope. If A Rate Applies Only To The Enclosed House, Do Not Automatically Apply It To A Garage, Carport Or Covered Outdoor Area. Use The House + Garage Mode When Those Spaces Need A Different Rate. If Your Source Rate Already Includes Them, Avoid Adding The Same Area Twice.
For Early Planning, A Concept Floor Area May Be Enough. As The Design Develops, Replace Rough Areas With Current Drawing Areas Or A Measured Schedule. Even A Small Change In Floor Area Can Affect The Base Cost Because The Difference Is Multiplied By The Construction Rate.
A Garage Or Covered Area Can Have A Different Level Of Finishes, Services And Internal Fit-Out From The Main Dwelling. The Separate Secondary-Area Fields Let You Test That Difference Without Applying One Rate To Every Square Metre.
(House Area × House Rate) + (Garage / Covered Area × Secondary Rate)
The Full Project Option Adds Major Allowance Categories To The Main Area-Based Construction Cost. Use It When You Want A Broader Feasibility Budget Rather Than Only A Building-works Number. The Separate Fields Make It Easier To See Which Items Are Driving The Difference Between Two Quotes.
If You Already Have A Preliminary Builder Estimate Or Tender Amount, The Known Base Cost Mode Lets You Start From That Figure Instead Of Rebuilding The Estimate From A Square-Metre Rate. Add Only The Costs That Sit Outside That Base Amount. The Optional Floor-Area Field Is Used To Show A Derived Overall Cost Per Square Metre.
The Contingency Field Applies Your Entered Percentage To The Subtotal Before Contingency. The Calculator Shows That Amount Separately So You Can See The Difference Between The Underlying Project Estimate And The Additional Planning Allowance.
Contingency Amount = Subtotal × Contingency Percentage ÷ 100
There Is No Single Contingency Percentage That Automatically Suits Every Project. The Allowance Can Depend On How Complete The Design Is, How Much Site Information Is Available, The Contract Structure, The Quality Of Existing Quotes And Which Risks Have Already Been Priced.
The Calculator Does Not Automatically Add Or Remove GST. Keep All Rates And Allowances On The Same Basis. If Your Main Build Rate Includes GST But Another Allowance Does Not, The Combined Total Will Not Be A Consistent Comparison. Check The Quote Or Estimate Notes Before Entering The Values.
Site-related costs often do not scale neatly with house floor area. Access, excavation, retaining, drainage, demolition, fill, rock, ground conditions and foundation requirements can affect the project independently of the size of the dwelling. That Is Why The Full Project Mode Keeps Site Works Separate From The Main A$/m² Rate.
Driveways, paths, slabs, footings and other external concrete can sit outside the main house price. If You Need To Check Concrete Quantity Separately, Use The Concrete Volume Calculator, Concrete Driveway Calculator, Concrete Foundation Calculator Or Total Concrete Cost Calculator.
The Tool Does Not Know The Design Complexity, Specification Level, Builder Margin, Labour Market, Structural System, Site Risk, Contract Inclusions, Authority Charges, Finance Costs, Variations Or Future Price Changes. It Performs Transparent Arithmetic On The Values You Enter. Use Current Project Documents And Quotes For Decisions That Depend On The Final Contract Amount.
Keeping Area, Rate, Allowances And Contingency Separate Makes A House Construction Estimate Easier To Review.
Use The Current Floor Area From Your Plan Or Estimate.
Enter A Rate Or Known Base Cost That Matches The Same Scope.
Add Only The Project Allowances Not Already Included.
Test Contingency And Compare The Final Budget With Quotes.
These Are Arithmetic Examples Only. The Rates Are Illustrative Inputs, Not Published Market Prices Or Recommended Budgets.
| Example | Floor Area | Entered Build Rate | Other Allowances | Subtotal Before Contingency |
|---|---|---|---|---|
| Example A | 120 m² | A$2,000/m² | A$20,000 | A$260,000 |
| Example B | 160 m² | A$2,250/m² | A$35,000 | A$395,000 |
| Example C | 200 m² | A$2,500/m² | A$50,000 | A$550,000 |
| Example D | 240 m² | A$2,750/m² | A$70,000 | A$730,000 |
Two House Construction Estimates Can Look Similar While Covering Different Work. Before Comparing The Totals, Check Whether The Floor Areas, Design Scope, Garage, Site Works, Service Connections, External Works, Selections, Provisional Sums And Exclusions Are Being Treated The Same Way.
| Budget Item | Question To Check | Where To Enter It |
|---|---|---|
| Main House Construction | What Floor Area And Inclusions Does The Rate Cover? | Build Rate Or Known Base Cost |
| Garage / Covered Areas | Included In Main Rate Or Priced Separately? | House + Garage Mode |
| Site Works | Included, Provisional Or Excluded? | Full Project → Site Works |
| Design / Approval Costs | Which Professional And Approval Items Are Outside The Build Price? | Full Project → Design & Approvals |
| Services / Connections | Who Pays For Connection And Authority Work? | Full Project → Utilities & Connections |
| External Works | Are Driveways, Paths, Fencing Or Landscaping Included? | Full Project → External Works |
| Contingency | What Additional Planning Allowance Do You Want To Test? | Common Contingency Field |
Simple Answers About Floor Area, A$/m² Rates, Site Costs, Allowances, Contingency And Builder Quotes.
It Uses The Calculation Mode You Select, Adds The User-Entered Construction Cost And Project Allowances, Then Applies Your Chosen Contingency Percentage.
No. You Enter The A$/m² Rate Yourself So The Estimate Can Match The Quote, Feasibility Rate Or Budget Scenario You Want To Test.
The Zero Is Only A Placeholder. When You Type A Number It Replaces The Placeholder, So The Calculator Does Not Add A Leading Zero To Your Entry.
Only If Your Estimate Is Intended To Price Both Areas At The Same Rate. Otherwise Use The House + Garage Option And Enter Separate Rates.
No. Add Them In The Full Project Mode Only When They Are Not Already Included In Another Figure You Have Entered.
No. Keep Your Inputs On A Consistent GST Basis. The Calculator Adds The Values Exactly As You Enter Them.
It Multiplies The Pre-Contingency Subtotal By Your Entered Percentage And Adds That Amount To The Estimated Project Total.
Yes. Use Known Base Cost Mode, Enter The Base Construction Amount And Add Only The Allowances That Sit Outside That Quote.
The Arithmetic Can Be Used For Planning, But Renovations And Extensions Can Have Different Cost Drivers From A New House. Use Rates And Allowances That Match The Work You Are Actually Considering.
No. It Is A Planning Calculator. Final Decisions Should Use Current Drawings, Specifications, Scope, Professional Advice And Actual Quotes Or Tenders Where Appropriate.
The PDF Includes The Selected Mode, Main Inputs, Base Construction Amount, Project Allowances, Contingency, Overall A$/m² Where Available And The Estimated Total.
Use Current Project Documents, Builder Inclusions And Relevant Australian Building Information When Refining A House Construction Budget.
National Construction Code And Building-System Information Relevant To Australian Building Work.
Visit ABCBOfficial Australian Data That Can Help Provide Broader Context For Building And Construction Activity.
Visit ABSConfirm The Current Rate, Inclusions, Exclusions, Allowances And Contract Scope For The Actual Project.
Use Current Floor Areas, Specifications, Engineering And Site Information When Updating The Budget.