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.
Contents
BT01 index values history in 2023 :
| Period | Date of publication (or forecast) in the official journal | Index value | Variation in % / previous month | Variation in % over 12 consecutive months |
| January 2023 | 03/16/2023 | 128.4 | +1.26% | +5.77% |
| February 2023 | 04/16/2023 | 129.7 | +1.01% | +6.14% |
| March 2023 | 05/13/2023 | 130.6 | +0.69% | +5.92% |
| April 2023 | 06/21/2023 | 130.5 | -0.08% | +4.48% |
| May 2023 | 07/16/2023 | 126.4 | -3.14% | 0.00% |
| June 2023 | 08/12/2023 | 130.3 | +3.09% | +2.44% |
| July 2023 | 09/16/2023 | 129.7 | -0.46% | +1.57% |
| August 2023 | 10/14/2023 | 130.6 | +0.69% | +2.11% |
| September 2023 | 11/16/2023 | 130.2 | -0.31% | +2.44% |
| October 2023 | 12/17/2023 | 130.3 | +0.08% | +2.44% |
| November 2023 | 01/17/2024 | 130.3 | No change | +2.44% |
| December 2023 | 02/17/2024 | 130.6 | +0.23% | +3.00% |
Use of the BT01 2023 index:
Rule:
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.
Formula:
[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.
