Construction output in Great Britain: July 2025

• Total construction output is estimated to have grown by 0.6% in the three months to July 2025. 

• Over the three-month period, new work increased by 1.0%, and repair and maintenance grew by 0.1%.

• At the sector level, four out of the nine sectors grew in the three months to July 2025; the main contributors to the increase were private housing repair and maintenance, and infrastructure new work, which grew by 3.8% and 2.1%, respectively.

• Monthly construction output is estimated to have grown by 0.2% in July 2025; this follows a rise of 0.3% in June 2025.

• The increase in monthly output in July 2025 came solely from an increase in new work (0.3%), as repair and maintenance was flat on the month (0.0%).

Construction output estimates

Construction output estimates are monthly estimates of the amount of output chargeable to customers for building and civil engineering work done in the relevant period, excluding Value Added Tax (VAT) and payments to subcontractors.

Seasonally adjusted estimates

Seasonally adjusted estimates are derived by estimating and removing calendar effects (for example, leap years such as 2024) and seasonal effects (for example, decreased activity at Christmas because of site shutdowns) from the non-seasonally adjusted estimates.

Value estimates

The value estimates reflect the total value of work that businesses have completed over a reference month.

Volume estimates

The volume estimates are calculated by taking the value estimates and adjusting to remove the impact of price changes.

Quality and methodology

More quality and methodology information (QMI) is available in:

• our Construction output QMI

• our Construction output price indices (OPIs) QMI

• our New orders in construction QMI

Reasons for revisions to construction output in this release

This release contains no revisions to previously published data and is consistent with the National Accounts Revisions Policy.

For further information on the revisions profile, see our Output in the construction industry revisions triangle (one-month growth) dataset and our Output in the construction industry revisions triangle (three-month growth) dataset.

Pausing of producer prices publications

Business prices data with corrected chain-linking methods have been used in the monthly gross domestic product (GDP) dataset for Producer Price Indices (PPI), Import Price Indices (IPI) and Export Price Indices (EPI) from January 2025 onwards.

Correctly chain-linked Services Producer Price Indices (SPPI) have been included in our monthly GDP dataset from April 2025 onwards.

In addition, the Construction Output Price Indices (OPI) calculated using the corrected PPI and SPPI data have been used from April 2025 onwards in this release and in our monthly GDP dataset.

The full implementation of updated business prices data will be managed in line with the National Accounts Revisions Policy, with the full time series update being included in our GDP quarterly national accounts, UK: April to June 2025 release on 30 September 2025 and Blue Book 2025 publication.

Further information on the chain-linking error in the producer prices dataset are detailed in our Methods update for Producer Price Indices (PPI) and Services Producer Price Indices (SPPI) published on 10 July 2025.

Blue Book 2025 publication update

The 2025 annual UK National Accounts, also known as Blue Book 2025, will incorporate more recent survey and administrative information, together with methodological improvements to the full data time series. 

In addition, Blue Book 2025 includes a full time series of corrected Producer Price Indices (PPIs) and Services Producer Price Indices (SPPIs).

On 19 August 2025 we published our Blue Book 2025: advanced aggregate estimates article to give users details of the impact of the 2025 UK national accounts update on current price and chained volume measure estimates of gross domestic product (GDP) from 1997 to 2023.

Data for 2023 will be estimated for the first time using the supply and use tables (SUTs) framework, and our estimates for 2021 and 2022 have been improved with updated data. The SUT framework looks at the supply of goods and services, how they are used in the economy, and their associated prices in detail. As part of this process, the base year in the Blue Book 2025 dataset has been updated to 2023.

The next quarterly National Accounts release on 30 September 2025 will incorporate these revisions, and any updates to 2023 onwards, in our official estimates in line with our National Accounts Revision Policy.

These will be incorporated into our Construction output data in our release on 16 October 2025.

Until the Blue Book 2025 data are incorporated into our Construction output data on 16 October 2025, our monthly GDP estimates will continue to have a reference and base year of 2022.

Seasonal adjustment

Our monthly construction estimates are seasonally adjusted. Seasonal adjustment is the process of removing the variations associated with the time of year, or the arrangement of the calendar, from a data time series.

Construction estimates, as for many data time series, are difficult to analyse using raw data because seasonal effects dominate short-term movements. Identifying and removing the seasonal component leaves the trend and irregular components.

The ONS uses the X-13-ARIMA-SEATS approach to seasonal adjustment. Seasonal adjustment parameters are monitored closely and regularly reviewed. For more information, please see our seasonal adjustment methodology page.

In our monthly estimates, seasonal adjustment is applied at the sector level and the seasonally adjusted series are aggregated to create estimates by total output. As part of our quality assurance approach, residual seasonality checks are regularly completed by our time series analysis team on both the directly seasonally adjusted series and the indirectly derived aggregate time series.

Subnational and subsector construction output

Data on new orders supplied by Barbour ABI are used to model the breakdown of the overall output figures for Great Britain into the lower level and regional data. This is shown in Tables 1 and 2 of our Output in the construction industry: subnational and subsector dataset. More detail is available in our Quality assurance of administrative data used in construction statistics methodology.

Bias adjustment

Typically, since the move to monthly gross domestic product (GDP) estimates, an adjustment to address any bias in survey responses for construction output is applied to the early construction output monthly estimates. We show this in our Improvements to construction statistics: addressing the bias in early estimates of construction output, June 2018 article.

Response rates for July 2025 showed improvement compared with levels in recent years since the coronavirus (COVID-19) pandemic. The survey turnover response rate for July 2025 was 73.0%. This follows a response rate of 77.8% in June and 76.5% in May. We have continued not to apply a bias adjustment since May 2020 while we review this approach. More information on our response rates is available in our Output in the construction industry dataset.

Differences with monthly GDP construction estimates

In Blue Book 2021, we introduced a new framework to improve how we produce volume estimates of GDP for balanced years as part of the supply-use process. This was explained in our Producing an alternative approach to GDP using experimental double deflation estimates article. This framework included the implementation of double-deflated industry-level gross value added (GVA) for the first time. This improvement was reflected in the GDP quarterly national accounts, UK: April to June 2021 bulletin and dataset and GDP monthly estimate, UK: August 2021 bulletin for the first time.

As a result, volume estimates in the monthly GDP and construction outputs releases will differ for the period 1997 to 2020. This is because the construction publication measures the volume of construction work (output), while the GDP series measures GVA (that is, output minus intermediate consumption). Construction estimates will align, but on a growth basis from January 2021 onwards.

Information and indicative effects of this change to industry-level GVA volume can be found in our Impact of double deflation on industry chain volume measure annual estimates article and our Impact of Blue Book 2021 changes on quarterly volume estimates of gross domestic product by industry article.

Accredited official statistics

These accredited official statistics were independently reviewed by the Office for Statistics Regulation in March 2019. They comply with the standards of trustworthiness, quality and value in the Code of Practice for Statistics and should be labelled “accredited official statistics”.