This publication contains preliminary estimates of building and engineering construction work done during the current quarter and revised estimates for the previous two quarters. The estimates of building work done and engineering work done are from the quarterly Building Activity Survey and the quarterly Engineering Construction Survey respectively. Estimates of work done are based upon a response from each survey of approximately 85% of the value of work done during the current quarter. More comprehensive and updated results will be available shortly in Building Activity, Australia and Engineering Construction Activity, Australia.
Construction Work Done, Australia, Preliminary methodology
How the data is collected
The scope of the building activity survey includes building activity relating to:
- construction of new buildings;
- alterations and additions to existing buildings;
- non-structural renovation and refurbishment work; and
- installation of integral building fixtures.
For the purposes of this collection, a building is a rigid, fixed and permanent structure which has a roof. Its intended purpose is primarily to house people, plant, machinery, vehicles, goods or livestock. An integral feature of a building's design is the provision for regular access by persons in order to satisfy its intended use.
The scope of the engineering construction collection comprises:
- value of engineering work done during the quarter
- values exclude the cost of land and repair and maintenance activity, as well as the value of any transfers of existing assets, the value of installed machinery and equipment not integral to the structure and the expenses for relocation of utility services. However, a contract for the installation of machinery and equipment which is an integral part of a construction project is included.
For the purpose of this collection engineering construction is any construction that does not have a roof eg roads, rail, pipelines etc. Where projects include elements of both building and engineering construction (for example, electricity generation, heavy industrial plant) every effort is taken to exclude the building component from these statistics.
A project is classified to a type of construction (bridges, roads) rather than to its end use eg mining. Data is collected separately for operations in each state and split into work for the private sector and work for the public sector.
The classification of work done for Public Private Partnerships and Joint Ventures may be classified as private sector although eventual ownership of the asset may reside with the public sector, depending who derives the economic benefit of the project upon completion.
Building activity data is collected from selected builders and building owners, and represents all approved public and private sector owned:
- residential building jobs valued at $10,000 or more.
- non-residential building jobs valued at $50,000 or more.
For historical changes to the collection design see the Directory of Statistical Sources on the ABS website.
Engineering construction data is collected from the primary contractor (not subcontractor) of projects and selections are made from any business which may undertake Engineering Construction activity. In most cases the statistical unit used to represent businesses, and for which statistics are reported, is the Australian Business Number (ABN) unit. The ABN unit is the business unit which has registered for an ABN, and thus appears on the Australian Taxation Office (ATO) administered Australian Business Register. The unit is classified to the relevant subdivision of Australian and New Zealand Standard Industrial Classification (ANZSIC), 2006 (Revision 2.0).
Further details about the ABS economic statistical units used in the Engineering Construction Survey, and in other ABS economic surveys (both sample surveys and censuses), can be found in Chapter 2 of the Standard Economic Sector Classifications of Australia (SESCA) 2008.
Relationship with National Accounts
Data on the value of work done on the construction of new private sector residential buildings, alterations and additions to private sector residential buildings, private sector non-residential buildings and the value of private sector engineering construction activity are the major sources of data which are used to compile the national accounts estimates for private gross fixed capital formation on dwellings, and other buildings and structures. However, there are some adjustments to the survey data which are made in the process of compiling these national accounts series. Allowances are made for the value of activity which is out of scope of the Building Activity Survey and the Engineering Construction Survey. Such activity includes work done on projects which fall below the size cut-offs used for the Building Activity survey and also the value of building work done which is undertaken without obtaining a building permit, either because such a permit is not required or because the requisite permit is not obtained. The national accounts estimates also make allowances for purchases (less sales) of buildings and other structures from (to) the public sector.
How the data is processed
The ownership of a building is classified as either private sector or public sector, according to the sector of the intended owner of the completed building as evident at the time of approval. Residential buildings being constructed by private sector builders under government housing authority schemes whereby the authority has contracted, or intends to contract, to purchase the buildings on or before completion, are classified as public sector.
Engineering projects are classified as private sector or public sector according to the expected ownership of the project at the time of completion. When a project is undertaken as a Private Public Partnership (PPP), or other similar arrangement, these projects will be classified according to the expected ownership of the asset at the time of completion. Projects undertaken as PPP's may be classified as private sector although ownership of the asset could eventually reside with the public sector.
The public sector includes Commonwealth Departments and Authorities, State Departments and Authorities, Local Government Authorities, Water, Sewerage and Electricity Authorities and government owned businesses and Statutory Authorities. All remaining organisations are classified as private sector.
Type of construction
Building jobs are classified both by the Type of building ('residential' and 'non-residential') and by the Type of work involved ('new' and 'alterations and additions'). For residential buildings these classifications are used in conjunction with each other.
An engineering project is classified to a category of construction without regard to end use. For example, a project involving coal handling equipment at an electricity generating plant is included under 'Heavy industry - Oil, gas, coal, bauxite, aluminia and other minerals' and not under 'Electricity generation, transmission and distribution'. Where a project involves more than one category of construction the project is included under the category which accounts for the major part of the contract in terms of value.
Treatment of GST
Statistics on the value of work (current prices) show residential building work done on a GST inclusive basis and non-residential work and engineering construction work done on a GST exclusive basis. This approach is consistent with that adopted in the Australian National Accounts which is based on the conceptual framework described in the 2008 edition of the international statistical standard System of National Accounts (SNA08).
SNA08 requires value added taxes (VAT), such as the GST, to be recorded on a net basis where:
- both outputs of goods and services and imports are valued excluding invoiced VAT
- purchases of goods and services are recorded including non-deductible VAT.
Under the net system, VAT is recorded as being payable by purchasers, not sellers, and then only by those purchasers who are not able to deduct it. Almost all VAT is therefore recorded in the SNA08 as being paid on final uses - mainly on household consumption. Small amounts of VAT, may however, be paid by businesses in respect of certain kinds of purchases on which VAT may not be deductible.
The ABS records value of work done inclusive of GST in respect of residential construction and exclusive of GST in respect of non-residential construction and engineering construction. Purchasers of residential structures are unable to deduct GST from the purchase price. For non-residential structures and engineering construction, the reverse is true in most circumstances.
Total construction work is derived by adding total building work and total engineering construction work. To derive total building activity it is appropriate to add the residential and non-residential components. Valuation of the components of the total is consistent, since, for both components, the value of work done is recorded inclusive of non-deductible GST paid by the purchaser. As such, total building activity and total construction includes the non-deductible GST payable on residential building.
As estimates for engineering work are provided on a GST exclusive basis, and the majority of construction materials used were exempt from Wholesale Sales Tax, the introduction of the GST had little direct effect on the estimates of engineering construction.
Seasonal adjustment is a means of removing the estimated effects of seasonal and calendar related variation from a series so that the effects of other influences can be more clearly recognised. It does not remove the effect of irregular or other influences (e.g. the approval of large projects or a change in the administrative arrangements of approving authorities). Since seasonally adjusted statistics reflect both irregular and trend movements, an upward or downward movement in a seasonally adjusted series does not necessarily indicate a change of trend. Particular care should therefore be taken in interpreting individual quarter to quarter movements.
Some of the component series shown have been seasonally adjusted independently. As a consequence, while the unadjusted components in the original series shown add to the totals, the adjusted components may not add to the adjusted totals. (For example, the sum of the adjusted state or sector series may not add to the adjusted Australian total). Therefore, figures should not be derived using the adjusted totals.
Seasonally adjusted estimates are produced by a seasonal adjustment method which takes account of the latest available original estimates. A detailed review of seasonal factors is conducted annually, generally prior to the release of data for the December quarter.
The ABS produces trend estimates to best represent the underlying behaviour in a series. Trend estimates are created by smoothing seasonally adjusted series to reduce the impact of the irregular component of the seasonally adjusted series. Abnormally high or low values (outliers) are discounted or excluded from the trend estimates.
Seasonally adjusted and trend estimates may be revised as new periods of data become available. Generally, revisions become smaller over time. Revisions to original data may also lead to revisions to seasonally adjusted and trend estimates.
As a general rule, caution should be exercised in using the seasonally adjusted series for dwelling unit commencements in Northern Territory and Australian Capital Territory. The small numbers and volatile nature of these data makes reliable estimation of the seasonal pattern very difficult.
Further information on seasonally adjusted and trend estimates can be found in the ABS Information papers Time Series Analysis Frequently Asked Questions, 2003 and A Guide to Interpreting Time Series - Monitoring Trends, 2003.
Chain Volume Measures
Chain volume estimates of the value of work done are presented in original, seasonally adjusted and trend terms.
While current price estimates of value of work done reflect both price and volume changes, chain volume estimates measure changes in value after the direct effects of price changes have been eliminated and therefore only reflect volume changes. The direct impact of the GST is a price change, and hence is removed from chain volume estimates. The deflators used to revalue the current price estimates in this publication are derived from the same price data underlying the deflators compiled for the dwellings and new other building components, and the new engineering construction component, of the national accounts aggregate ‘Gross fixed capital formation’.
The chain volume measures of work done appearing in this publication are annually reweighted chain Laspeyres indexes referenced to current price values in a chosen reference year. The reference year is updated annually in the September quarter publication. Each year’s data in the value of work done series are based on the prices of the previous year, except for the quarters of the latest incomplete year which are based upon the current reference year. Comparability with previous years is achieved by linking (or chaining) the series together to form a continuous time series.
Chain volume measures do not, in general, sum exactly to the extrapolated total value of the components. Further information on the nature and concepts of chain volume measures is contained in the ABS Information Paper: Australian National Accounts, Introduction of Chain Volume and Price Indexes .
The factors used to seasonally adjust the chain volume series are identical to those used to adjust the corresponding current price series.
Accuracy and quality
Since the estimates of both building activity and engineering activity are based on sample surveys they are subject to sampling error; that is they may differ from the figures that would have been obtained if information for all approved jobs or organisations for the relevant period had been included in the survey.
One measure of the likely difference is given by the standard error (SE), which indicates the extent to which an estimate might have varied by chance because only a sample of approved jobs was included. There are about two chances in three that a sample estimate will differ by less than one SE from the figure that would have been obtained if all approved jobs had been included, and about nineteen chances in twenty that the difference will be less than two SEs. Another measure of sampling variability is the relative standard error (RSE), which is obtained by expressing the SE as a percentage of the estimate to which it refers. The RSEs of estimates provide an indication of the percentage errors likely to have occurred due to sampling, and are shown in Data Cubes (see Data downloads section of the publication).
An example of the use of RSEs is as follows. If the total value of work done during the quarter is $2,500m and the associated RSE is 0.5% then there are about 2 chances in 3 that the value which would have been obtained if there had been a complete collection would have been within the range $2,488m to $2,513m and about 19 chances in 20 that the value would have been within the range $2,475m to $2,525m.
Estimates that have an estimated relative standard error between 10% and 25% are annotated with the symbol ‘^’. These estimates should be used with caution as they are subject to sampling variability too high for some purposes. Estimates with an RSE between 25% and 50% are annotated with the symbol ‘*’, indicating that the estimate should be used with caution as it is subject to sampling variability too high for most practical purposes. Estimates with an RSE greater than 50% are annotated with the symbol ‘**’ indicating that the sampling variability causes the estimates to be considered too unreliable for general use.
How the data is released
Statistics are released for the March, June, September and December quarters, approximately 9 weeks after the end of the reference period.
Final Engineering construction estimates are released approximately 13 weeks after the end of the reference period in Engineering Construction, Australia. Final Building activity estimates are released approximately 14 weeks after the end of the reference period in Building Activity, Australia.
History of changes
Review of seasonal adjustment
In early 2020 the ABS advised that the method used to produce seasonally adjusted estimates would be changed from the ‘concurrent adjustment’ method to the ‘forward factors’ method for series with significant and prolonged impacts from COVID-19. Further information can be found in Methods changes during the COVID-19 period.
The Building component of Construction Work Done was impacted by lower migration, economic uncertainty and activity restrictions, but was more significantly impacted by the Federal Government HomeBuilder Stimulus which was announced in June 2020 for new homes and renovations (alterations and additions). Impacted Building Activity series were treated with forward factor seasonal adjustment between September 2020-June 2022, and returned to concurrent seasonal adjustment in September 2022. For more information about the seasonal adjustment changes to Building Activity during COVID-19, see the Building Activity methodology.
The Engineering Construction component of Construction Work Done did not record any significant or prolonged impacts from COVID-19, and continued to be treated with concurrent seasonal adjustment during this period.
Review of trend suspension
In early 2020 the ABS suspended trend series, in addition to adopting forward factors to produce seasonally adjusted series. The trend estimate indicates the medium to long direction of a time series. To estimate the trend, the effect of significant events like disruptions associated with COVID-19 are assigned to either the trend or irregular components of a time series. The rationale for suspending trend series was that it was unknown whether the impacts from COVID-19 would be short or medium to long-term, and therefore there was high probability of needing to significantly revise initial assessments of the impacts of COVID-19 on the trend.
The trend series for Construction Work Done was reviewed and reinstated in the September 2022 release, including during the COVID-19 period from June 2020 - June 2022.
List of electronic tables
The following tables are available electronically via the ABS web site. Not all series in the table go back to the earliest start date.
|Electronic table no.||Start date|
|Value of Construction Work Done, by Sector, Chain Volume Measures, Australia||1||September 1974|
|Value of Construction Work Done, by Sector, Current Prices, Australia||2||March 1957|
|Value of Building Work Done, by Sector, Chain Volume Measures, Australia||3||September 1974|
|Value of Building Work Done, Chain Volume Measures, States and Territories, Original||4||September 1974|
|Value of Building Work Done, Chain Volume Measures, States and Territories, Seasonally Adjusted||5||September 1974|
|Value of Building Work Done, by Sector, Current Prices, Australia||6||March 1957|
|Value of Building Work Done, by Sector, Current Prices, States and Territories, Original||7||September 1958|
|Value of Construction Work Done, Chain Volume Measures, States and Territories||8||September 1974|
|Value of Construction Work Done, Current Prices, States and Territories, Original||9||March 1957|
|Engineering Construction Work Done, by Type of Construction, Australia, Original||10||September 1986|
|Engineering Construction Work Done, by Type of Construction, State and Territories, Original||11||September 1986|
|Electronic table no.||Start date|
|Relative Standard Errors, Building Work Done - Australia||Datacube||..|
|Relative Standard Errors, Building Work Done - States and Territories||Datacube||..|
|Relative Standard Errors, Total Construction Work Done - States and Territories||Datacube||..|
|Relative Standard Errors, Engineering Construction Work Done - Australia||Datacube||..|
|Relative Standard Errors, Engineering Construction Work Done - States and Territories||Datacube||..|
|ABN||Australian Business Number|
|ABS||Australian Bureau of Statistics|
|ACT||Australian Capital Territory|
|ANZSIC||Australian and New Zealand Standard Industrial Classification|
|ATO||Australian Taxation Office|
|GST||goods and services tax|
|NSW||New South Wales|
|TAU||type of activity unit|
|VAT||value added tax|
Alterations and additions
Building activity carried out on existing buildings. Includes alterations and additions to floor area, the structural design of a building, and affixing rigid components which are integral to the functioning of the building.
A building is a rigid, fixed and permanent structure which has a roof. Its intended purpose is primarily to house people, plant, machinery, vehicles, goods or livestock. An integral feature of a building’s design is the provision for regular access by persons in order to satisfy its intended use.
Building work done
The Value of building work done including only work carried out during the quarter.
Construction work done
The sum of building work done and engineering work done.
A dwelling is a self-contained suite of rooms, including cooking and bathing facilities, intended for long-term residential use. A dwelling may comprise part of a building or the whole of a building. Regardless of whether they are self-contained or not, rooms within buildings offering institutional care (e.g. hospitals) or temporary accommodation (e.g. motels, hostels and holiday apartments) are not defined as dwellings. Such rooms are included in the appropriate category of non-residential building approvals.
Engineering work done
The Value of engineering work done including only work carried out during the quarter.
Building activity which will result in the creation of a building which previously did not exist.
Buildings primarily intended for purposes other than long term residence.
Buildings primarily used for long-term residential purposes. Residential buildings are categorised as houses or other residential buildings.
Type of building
Buildings are classified as either:
Buildings are classified as either Residential building or Non-residential building.
Buildings are classified further in the ABS Functional Classification of Buildings 1999 (Revision 2011).
Type of construction
Type of construction refers to the category of non building construction undertaken, e.g. Roads, highways and subdivisions; Bridges; Railways; etc.
Type of work
The Type of work classification refers to building activity approved to be carried out and consists of New or Alterations and additions.
Value of building work done
Includes the costs of materials fixed in place, labour, and architects fees. It excludes the value of land and landscaping and non-building components such as fencing, paving, roadworks, tennis courts, outdoor pools and car parks.
Value of engineering work done
The value of engineering work done for the private sector consists of the value of work done on prime contracts, plus speculative contracts, plus work done on own account. The value of engineering work done for the public sector is the work done by the organisation's own workforce and subcontractors. In each case, the value excludes the cost of land and repair and maintenance activity, as well as the value of any transfers of existing assets, the value of installed machinery and equipment not integral to the structure and the expenses for relocation of utility services. However, a contract for the installation of machinery and equipment which is an integral part of a construction project is included.
All tables in this publication, plus some additional state and territory series are available in electronic form on the ABS web site.
Users may also wish to refer to the following publications:
Building Activity, Australia
Building Approvals, Australia
Engineering Construction Activity, Australia
Residential Property Price Indexes: Eight Capital Cities
Housing Finance, Australia
Private Sector Construction Industry, Australia
Producer Price Indexes, Australia