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Construction cost calculator

Central Coast Builder (NSW)

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Gecko Homes

Aspect Designs, Sydney, NSW

Central Coast Builder. New homes & renovations.

How it works

For a detailed explanation of how this residential construction cost calculator works read this article: 'Estimating building costs'.

If you already have detailed construction plans we recommend you get accurate quotes from local builders.

Step 1: Initialise the calculator

Select project type

Project definitions

  1. New house: A completely new dwelling.
  2. Renovation: Fixing up an existing house. Can include additions.
  3. Addition/Extension: Adding new spaces to an existing house. Requires roof extensions and wall removals.
  4. Separate pavilion: The creation of a separate building that may or may not be joined to the existing house with a covered walkway or something similar; e.g. a granny flat.

Step 2: Select site condition

   

Definitions

  1. Excellent: Flat level block of land with no drainage issues.
  2. Good: Slightly sloping block. Minor drainage issues.
  3. Difficult: Steep block. Block with drainage issues. Bushfire zone.

Step 3: Quality of finishes

   

Definitions

  1. Basic: By selecting this option you are stating that you will be buying items such as bathroom & kitchen fittings, door hardware, et cetera, where cost is of higher concern than quality or style.
  2. Standard: Selecting 'standard' states that quality is as important as cost, but style is less important than either.
  3. Luxury: Quality and style are more important than price.

Step 4: Per-square-metre costs

Based on the choices you made above we have set some average per-square-metre costs for you below. For more accurate values refer to BMT's construction cost table or contact a a few local builders or residential architects.

Internal spaces:

per m2

Decks, verandahs & patios:

per m2

Garages:

per m2

Step 5: Enter size of the following spaces

If you selected 'new house' the values below have been pre-set for a small 3 bedroom, open plan house.

Change the areas shown below to suit your requirements.

kitchen

m2

master bedroom

m2

main bathroom

m2

ensuite bathroom

m2

2nd toilet/bathroom

m2

walk-in robe

m2

lounge area

m2

bedroom 2

m2

office/study

m2

bedroom 3

m2

rumpus area

m2

bedroom 4

m2

dining area

m2

laundry

m2

garage

m2

decks, patios & verandahs

m2

indoor circulation

%

e.g. hallways, stairs, entrance

Other bedrooms X m2
Other bathrooms X m2
Other indoor areas X m2

Step 6: Get an approximate cost

Click this button to calculate/update the estimate below.

Total estimated cost:     $

Step 7: Get 3 quotes for an accurate cost

Don't waste time doing the ring around, get 3 reliable local businesses to quote you for a new bathroom design or installation. Our quotation service is obligation-free.

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Frequently asked questions (FAQ)

Q. How accurate is your calculator?

A. Our calculator gives reasonable initial estimates, ie. before there are detailed plans. Experienced builders who use our calculator have told us they can get to within 10% of the final cost - so the better your research for reasonable per-square-metre costs the more accurate our calculator will be. For reasonable per-square-metre costs in Australia use BMT's construction cost table. If you have not already done so read our article about Building Cost Estimates for more information.

Q. Where can I get cost data?

For reasonable per-square-metre costs for your local area refer to BMT's construction cost table.

Q. What is circulation?

A. Circulation refers to hallways, entrances and stairways. Use 10% for a basic no-frills house. Use 20% - 25% if you want your house to feel spacious.

Q. How will my non-standard features such as high ceilings affect the cost?

A. Hard to say. The best you can do before detailed house plans are drawn up is increase the per-square-metre rates used by the calculator. The calculator has an option called 'Quality of finish' which allows you to select 'basic', 'standard' or 'luxury'. Selecting standard increases the per-square-metre rate by $300. Selection 'luxury' increases the rate by $600.

iPhone version of calculator

Builders Buddy icon

Builders Buddy is an iPhone construction cost estimator & calculator for new houses, renovations & additions. Builders Buddy gives a preliminary estimate of building costs. It is only suitable for use before any detailed plans are made.

Video: How to keep construction costs down

Six essential tips you need to know. Read the article.

Sponsors

Aspect Design Aspect Designs are a multi-disciplined, award winning, Sydney based business who specialise in architecture, interior design, drafting and landscape design.
Coastal Construction & Building If you are building a new home or renovating on Sydney's North Shore, the Central Coast or the Hunter region, Coastal Construction & Building offer full-contract, project management or labour-only contracts so you can choose which contract option works best for you.
Gecko Homes Gecko Homes specialise in new homes and renovations. Gecko Homes service the NSW Central Coast, Sydney and Newcastle.
Angela Elliss Design Angela and her team understand that communication is the key to making your new home design or renovation a success. They are with you every step of the way, answering every question. Angela has over 15 years of experience in residential building design combined with an architecture degree from the University of Newcastle, NSW. If you are starting from scratch, renovating, or just need advice on where to start and how the building process works, give Angela a call. For detailed information visit the website.