Exhibit 15.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We hereby consent to the incorporation by reference in the Registration Statement on Form S-8
(No. 333-14036) of James Hardie Industries N.V. of our report dated June 28, 2007 relating to the
financial statements, managements assessment of the effectiveness of internal control over
financial reporting and the effectiveness of internal control over financial reporting, which
appears in this Form 20-F.
/s/ PricewaterhouseCoopers LLP
PricewaterhouseCoopers LLP
Los Angeles, California
July 6, 2007