<Page> Exhibit 23.4 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in this Registration Statement on Form S-3 of our report dated February 25, 2004 relating to the financial statements and financial statement schedules, which appear in ACE Limited's Annual Report on Form 10-K for the year ended December 31, 2003. We also consent to the references to us under the heading "Experts" in such Registration Statement. PricewaterhouseCoopers LLP New York, New York January 10, 2005