1
 
                                                                    EXHIBIT 23.1
 
The Board of Directors
Modtech, Inc.:
 
The audits referred to in our report dated March 21, 1997, included the related
financial statement schedule as of December 31, 1996, and for each of the years
in the three-year period ended December 31, 1996, included in the registration
statement. This financial statement schedule is the responsibility of the
Company's management. Our responsibility is to express an opinion on this
financial statement schedule based on our audits. In our opinion, the financial
statement schedule, when considered in relation to the basic financial
statements taken as a whole, presents fairly in all material respects the
information set forth therein.
 
We consent to the use of our report included herein and to the reference to our
firm under the heading "Experts" in the prospectus.
 
                                                           KPMG Peat Marwick LLP
 
Orange County, California
October 31, 1997