This tool provides a comprehensive, detailed and easy to use method of measuring cost movement for building and civil engineering. Widely used in the construction and infrastructure sector to help fairly allocate risk between the client and sub-contractors
Published: 14/01/2026
The price adjustment formulae is a method of calculating the increase, or decrease, in contractors’ costs over any period using the BCIS Price Adjustment Formulae Indices (PAFI), which are published as part of BCIS CapX.
The formulae and the indices are widely used in larger building civil engineering contracts. BCIS publishes indices for building trades, civil engineering, specialist engineering and highways.
The publication dates of the monthly indices have contractual significance and are published in BCIS CapX.
The PAFI will, unless otherwise stated, be published monthly at 12 noon on the Tuesday following the release of the Office for National Statistics (ONS) Producer Price Indices (PPIs), which will usually be the Wednesday following the second Friday of the month.
The PAFI publication dates for 2026 are as follows:
- 27 January 2026
- 24 February 2026
- 31 March 2026
- 28 April 2026
- 27 May 2026 – Wednesday
- 23 June 2026
- 28 July 2026
- 25 August 2026
- 22 September 2026
- 27 October 2026
- 24 November 2026
- 22 December 2026
Publication outside of this schedule will be preannounced.
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