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                                                                    EXHIBIT 23.1


The Board of Directors
Modtech Holdings, Inc.:

We consent to incorporation by reference in the registration statements (No.
333-79023 and No. 333-81169) on Form S-8 of Modtech Holdings, Inc. of our report
dated March 10, 2000, relating to the consolidated balance sheets of Modtech
Holdings, Inc. and subsidiaries as of December 31, 1998, and 1999, and the
related consolidated statements of income, retained earnings, and cash flows
for each of the years in the three-year period ended December 31, 1999, and all
related schedules, which report appears in the December 31, 1999, annual report
on Form 10-K of Modtech Holdings, Inc.


                                             /s/ KPMG LLP

Orange County, California
March 30, 2000