Dear Sirs,

Exhibit (b)(iii)

Lafarge SA
Attention: Head of Treasury Department

April 3, 2006

Dear Sirs,

We refer to the US$2,800,000,000 Facility Agreement dated 5 February 2006 (the “Facility Agreement”) between you, as Borrower, and the Finance Parties. All capitalized terms in this letter have the meaning ascribed to them in the Facility Agreement.

In our capacity as Mandated Lead Arrangers, we hereby confirm, pursuant to Section 20.10 (b) of the Facility Agreement, that we have been duly informed of your intention to increase the per share price offered for the Shares from US$75 to US$82, and that we give our consent to such increase.

Yours sincerely,

/s/ Xxxxxxx xx Xxxxxxxx		/s/ Xxxxxxx Xxxxxxx
BNP PARIBAS		XX XXXXXX PLC
By: Xxxxxxx xx Xxxxxxxx		By: Xxxxxxx Xxxxxxx