BT01 2023 – National Building Index (all trades)

The BT01 2023 index is France’s national construction index (all trades).

It measures changes in the cost of factors of production in the building industry and is the official reference for updating and revising construction contract prices.

The Index was created by a decree published in the Official Journal on December 20, 2014 (base 100 = 2010 average) and is published monthly by INSEE. It thus succeeds the Index of Building and Public Works (bases 1974 and 1975), which has been discontinued.

BT01 2023 index evolution
Download the latest official values of the BT01 2023 index

BT01 index values history in 2023 :

PeriodDate of publication (or forecast) in the official journalIndex valueVariation in % / previous monthVariation in % over 12 consecutive months
January 202303/16/2023128.4+1.26%+5.77%
February 202304/16/2023129.7+1.01%+6.14%
March 202305/13/2023130.6+0.69%+5.92%
April 202306/21/2023130.5-0.08%+4.48%
May 202307/16/2023126.4-3.14%0,00%
June 202308/12/2023130.3+3.09%+2.44%
July 202309/16/2023129,7-0.46%+1.57%
August 2023Publication around October 18, 2023UNKN/AN/A
September 2023Publication around November 18, 2023UNKN/AN/A
October 2023Publication around December 18, 2023UNKN/AN/A
November 2023Publication around January 18, 2024UNKN/AN/A
December 2023Publication around February 18, 2024UNKN/AN/A
Table of BT01 index values and publication schedule for the year 2023

Use of the BT01 2023 index:


The price of the service of the contract of services will be revised at each expiry of the agreement according to a formula that integrates the evolution of the BT01 Index.


[New price] = [old price] X [Known reference index BT01] / [Reference index BT01]

Attention, do not confuse the BT01 Index with the Construction Index or the Rent Reference Index, used respectively to revise rents for private individuals and leases for professionals.

The values in this table will be updated at the rate of the publication of the Index during the year 2023.

Frequently asked questions (FAQ) about the BT01 2023 index

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