Home Building Cost Calculator Sydney — All Australian Architecture

Our costing calculator lets you quickly estimate your likely build across 9 different 'quality levels' of design & construction.

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New Build

Alterations & Additions

Measure your plan ...

We have an interactive form that helps you calculate your gross floor area.
Just provide us with the widths and depths of different rooms,
and we will provide the total areas plus the allowances.
Click here to calculate your gross floor area.

New Internal Area sqm

Measure all internal floor areas (to the outside of the external walls), including garages.

Do not include carports.

Renovated Internal Area sqm

New External Area sqm

Measure all external built areas like carports, decks, verandas, terraces, balconies, covered areas.

Do not include driveways and paths.

Renovated External Area sqm

New Driveways & Paths sqm

Measure uncovered driveways, gutter crossings & simple paths.

Do not include landscaping.

Renovated Driveways & Paths sqm

New Pool & Spa sqm

Measure full extend of pool enclosure that is hard surface or water.

Do not include landscaping.

Renovated Pool & Spa sqm

Demolition

Whole house sqm

Detailed demolition
(part house) sqm

Only count demolition that is not within a New or Renovated (Internal or external) area (but not driveways or paving).

This is a way of picking up work that falls outside the area of general works.

Measure the area of footprint affected

Custom Site Options

Soft Landscaping $

Custom External $

Custom External 2 $

Custom External 3 $

Custom External 4 $

Add in additional site options like cabanas, sheds etc.

Excavation

Bulk Excavation cubic m

Detailed Excav. cubic m

Measure the area of footprint affected and multiply by the average depth of excavation = volume.

How many new fit-out items?

Kitchen

Kitchenette

Bathrooms

Ensuites

Powder Rooms

Staircases

Home cinema rooms

Laundry

Custom Fit-out $

Custom Fit-out 2 $

Custom Fit-out 3 $

Notes on internal items

The number and type of internal fit-out items can be a major in the cost of a project.

Your building cost will be significantly more if you have many ensuite bathrooms or lots of internal joinery.

The budget cost of these items is adjusted by the Quality scale in Step 4, and the allowance is show in the Summary.

Total length of new fixtures?

Robe - total all rooms m length

Bespoke Joinery
- total all rooms m length

Balustrading (external)
- except staircase m length

Balustrading (internal)
- except staircase m length

Wiring & home automation

Standard wiring

Basic C'bus only

Full C'bus automation

External Openings

Measure in elevation
ie Area of glass plus frame, 2x2m
window = 4 sqm approx.

Doors / Windows
- In new or changed openings sqm

Doors / Windows
- Replaced in existing unchanged openings sqm

Note: Internal doors and windows are
covered in floor areas.

Only add windows here when they are not within an area that is New or Renovated (Internal or external) area (but not driveways or paving).

This is a way of picking up individual window additions or replacements that fall outside the general works.

Quality Scale


Project Homes	Custom Homes	Architectural Homes

Auto

Quality Scale Assistant - Try our 12 point checklist (Auto Quality Scale)
1 - Number of levels (select only one)
Single storey, simple two storey	Split levels, 3 storey, some stepping levels	4 or more levels, many stepping levels
2 - Footprint & plan shape (select only one)
Simple shapes such as rectangular, linear	Irregular shapes, longer perimeter	Complex / articulated shapes or curves
3 - Roof Shape (select any / all that apply)
Simple with few features	Simple with many features, detailed	Articulated / Organic / Unusual Shape
4 - Roof Cladding (select any / all that apply)
Standard roofing such as Colorbond or Concrete tile	Mid range roofing such as slate, ceramic slate, Ritek	High quality roofing such as zinc, copper, concrete & membrane, earth covered
5 - Doors & Windows (select any / all that apply)
Simple windows & doors, single glazed Standard / stock	Louvre windows & bi-fold doors, double glazed Domestic quality	Large composite windows, louvres, lots of glass, performance glass Commercial quality
6 - Wall structure (select any / all that apply)
Single skin Lightweight	Double skin Such as brick veneer	Double skin Such as full brick
7 - Wall finish (select any / all that apply)
None or minimal ie face brick, off form concrete, unfinished, bagged	Common finishes such as render, cladding, weatherboard, all with paint finish	Special stone clad, zinc clad, aluminum panel, other non standard / feature
8 - Ground floor structure (select any / all that apply)
Slab on ground only, screw in piles	Suspended concrete generally	Open plan - large span concrete, cantilevers
9 - Flooring excl. wet area (select any / all that apply)
Low range flooring such as floating floor, sheet vinyl, carpet	Mid range flooring such as standard timber / ceramic tile	Polished concrete High end timber or stone tile, parquetry
10 - Lighting (select any / all that apply)
Basic / Minimal such as single fitting per room, surfaced fittings	Multiple fittings per room, some feature lights, fans, downlights	Designer / quality fittings, multiple lighting sources, feature and external lighting
11- Trims (select any / all that apply)
Basic / standard architraves, skirtings, cornices	Fewer trims or simple trimless, some trims	Decorative cornices, pure minimal trims, high end detailing
12 - Kitchen fit-out (select any / all that apply)
Basic finish & budget appliances, such as melamine and laminate benchtops	Mid range finish such as stone tops & Polyurethane paint, mid range appliances	High end stone tops, splashbacks, veneers, and high end appliances

Sloping Site

Mostly flat / gentle slope (0-10 deg)

Significant slope (10-25 deg)

Very steep (more than 25 deg)

Notes on slope

Sloping sites can increase the cost of your home dramatically.

This extra cost is because of more complexity in the structure, more stepping of floor levels, stepping of roofs, more excavation & retaining, more steps and stairs, more difficult scaffolding and more site drainage.

Site Access

Good Access

Only average access

Difficult access

Notes on Access

One for the first things builders will look for is site access.

Difficult access will make your build take longer, because it slows down every trade, makes deliveries more difficult & may require the use of hoists, cranes & conveyors.

Bushfire affected

Not affected

Affected up to BAL 40

Flame zone affected

Notes on bushfire

There are different categories of construction for different BAL (Bushfire Attack Level) ratings, and the higher ratings create a more costly build.

Marine environment

More than 500m from breaking surf

100m - 500m breaking surf

Within 100m of breaking surf

Notes on Marine

A marine environment will require more attention to detail and a much higher spec. for some fixtures, fittings, finishes and accessories.

Galvanised steelwork, fixings & ties will need to be replaced by special paint finishes and or stainless steel.

Claddings & external light might need to be copper or zinc instead of metal or aluminium.

Market conditions

Recession

Normal

Boom conditions

Notes on Market Conditions

The construction industry is cyclic and this will cause building costs to vary.

There are times when builders will put their rates down to get work and busy times when builders rates get much higher.

Builder type

Owner Builder

Notes on Builders

Being an owner builder will typically save you a ‘builders margin’ but it will likely cost elsewhere in the build and your project will usually take longer to complete.

Contingency

Automatically calculate

Custom $

None

Notes on Contingency

This is an allowance for costs that will occur on your project but that are hard to estimate with a quick costing. It is for unforeseen items, overruns, some amount of changes in the project that result in extra cost.

Our automatic calculation will suggest a contingency sum for your project and this will vary depending up the size, quality level and other factors. You can allocate your own contingency amount using ‘Custom’.

Cost per square m:$0 - $0

* This is a common rule of thumb for estimating building costs. Our figure for your renovation is calculated from all the inputs provided to produce a more accurate costing than by using square metre rates alone.

* Rate excludes all Demolition, Excavation, Driveways & Paths, Pools and Spas, and all outdoor living areas, decks, patios, balconies, porches, carports.


Preliminaries (see 1 below)	$	-	$
Building Shell	$	-	$
Building Fit-out	$	-	$
External & Siteworks	$	-	$
Contingency	$	-	$
Builder's Margin (see 2 below)	$	-	$
GST 10%	$	-	$
Total	$	-	$

Exclusions:

Stormwater systems and On-site detention
Complete rewiring & meter board replacement
Sewer pipe replacement, clay to PVC
Building over sewer mains
Tree removal
Asbestos removal
Internal soft furnishings
Blinds and curtains

1 - Preliminaries:

This cost covers items such as; the builders surveyor for setting out the works, temporary fencing or hoarding, environmental protection such as erosion and sediment control, general site clearing, scaffolding, amenities, site toilets, first aid, required signage, some specialist documentation such as shop drawings, crane-age, hoists & other equipment hire, permits, some councils fees, dilapidation reports, site cleaning & rubbish /debris removal, contract costs and legals, plus insurances.

2 - Builder's Margin:

This builders margin covers the builders overhead and profit. Overhead includes expense items such as office costs, accounting, legals, advertising, vehicles, tools, training, professional and business administration costs.

The covering overheads the remaining profit is reward for taking on risk, provides money for new equipment and growing the business, working capital, and importantly is what they dip into to cover mistakes and some unforeseen costs on your project, i.e. underquoting.

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Disclaimer:

This costing is aimed at the budgeting stage & is not intended to replace the costing services of a builder or QS (Quantity Surveyor).

Preliminaries	$	-	$
Building Shell	$	-	$
Building Fit-out	$	-	$
External & Siteworks	$	-	$
Contingency	$	-	$
Builder's Margin	$	-	$
GST 10%	$	-	$

Total $0 - $0

Home BuildingCost Calculator

5 Easy Steps

Begin Here

Already have a costing?

Forgot your costing details?

Step 1

What is your build type?

Measure your plan ...

Step 2

Initial siteworks ...

Step 3

Your fit-out items ...

Notes on internal items

Step 4

Quality of design / materials / details ...

Step 5

Other cost factors ...

Notes on slope

Notes on Access

Notes on bushfire

Notes on Marine

Notes on Market Conditions

Notes on Builders

Notes on Contingency

Finished

Here is your cost breakdown ...

Exclusions:

1 - Preliminaries:

2 - Builder's Margin:

Save your information:

Sending a copy:

Disclaimer: