<PAGE>

================================================================================
                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                                  Form 10-Q/A
(Mark One)
[X]  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
     ACT OF 1934

               For the quarterly period ended September 30, 2000
                                      OR
[ ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934
             For the quarterly period from __________ to __________

                       Commission file number 333-62635

                             --------------------


                       CENTURY MAINTENANCE SUPPLY, INC.
            (Exact name of registrant as specified in its charter)

                             --------------------

           Delaware                                               76-0542935
(State or other jurisdiction of                               (I.R.S. Employer
 incorporation or organization)                              Identification No.)


       10050 Cash Road, Suite 1                                      77477
            Stafford, Texas                                        (Zip Code)
(Address of Principal Executive Offices)

                                (281) 208-2600
             (Registrant's telephone number, including area code)

                                Not Applicable
  (Former name, former address and former fiscal year, if changed since last
report).

     Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.

Yes [X] No [_]

     The number of shares of Common Stock, $0.001 par value, outstanding (the
only class of common stock of the Company outstanding) was 12,201,945 on
November 13, 2000.

--------------------------------------------------------------------------------
<PAGE>

                          PART II.  OTHER INFORMATION



ITEM 6.   EXHIBITS AND REPORTS ON FORM 8-K

     (a)  Exhibits

          10.19 Amendment No. 1 to Credit Agreement (replaces the previous
          Exhibit 10.19 of the same name to Century Maintenance Supply, Inc.'s
          Quarterly Report on Form 10-Q for the quarter ended September 30,
          2000, filed on November 14, 2000).

          27.1*  Financial Data Schedule

     (b)  Reports on Form 8-K

          None.

     *Previously filed.

                                       1
<PAGE>

SIGNATURE

     Pursuant to the requirements of the Securities Act of 1934, the registrant
has duly caused this report to be signed on its behalf by the undersigned
thereunto duly authorized.


                              CENTURY MAINTENANCE SUPPLY, INC.,
                              a Delaware corporation


December 13, 2000             By: /s/ Richard E. Penick
                                  ---------------------
                              Richard E. Penick
                              Chief Financial Officer, Vice President and
                                Assistant Secretary
                              (Duly Authorized Officer and Principal Financial
                                 Officer)

                                       2