The BT01 2021 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.
Below is the table of BT01 index values for the year 2021:
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Contents BT01 index values history in 2021 |
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| Period |
Index value |
Variation in % / previous month |
Variation in % / December of the previous year |
Index evolution in % over 12 months |
Index evolution in % over two years |
| January 2021 |
114.4 |
+0.70% |
+0.70% |
+2.33% |
+3.91% |
| February 2021 |
115.2 |
+0.70% |
+1.41% |
+3.04% |
+4.44% |
| March 2021 |
116.1 |
+0.78% |
+2.20% |
+3.94% |
+4.97% |
| April 2021 |
116.3 |
+0.17% |
+2.38% |
+ 4.30% |
+ 4.87% |
| May 2021 |
116.6 |
+0.26% |
+2.64% |
+ 4.39% |
+ 5.05% |
| June 2021 |
117.5 |
+0.77% |
+3.43% |
+4.91% |
+5.67% |
| July 2021 |
118.5 |
+0.85% |
+4.31% |
+5.61% |
+6.56% |
| August 2021 |
118.5 |
Unchanged |
+4.31% |
+5.33% |
+6.18% |
| September 2021 |
118.6 |
+0.08% |
+4.40% |
+5.05% |
+6.46% |
| October 2021 |
119.1 |
+0.42% |
+4.84% |
+5.49% |
+6.91% |
| November 2021 |
119.5 |
+0.34% |
+5.19% |
+5.57% |
+7.37% |
| December 2021 |
119.7 |
+0.17% |
+5.37% |
+5.37% |
+7.26% |
Use of the BT01 2021 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 2021.
BT01 Index History
All the values of the BT01 index since 2006:
History of the BT01 building index — All trades – Base 2010:
Latest BT01 Index Updates:
Latest values of the building index BT01 – All trades – Base 2010:
Frequently Asked Questions about the BT01 Index
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