SECURITIES & EXCHANGE COMMISSION
                             Washington, D.C. 20549
                             ----------------------

                                  SCHEDULE 13G*
                                 (Rule 13d-102)


             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
           TO RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED
                              PURSUANT TO 13d-2(b)

                              Quanta Services, Inc.
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                    74762E102
                                 (CUSIP Number)

                                  July 18, 2005
             (Date of event which requires filing of this statement)


     Check the appropriate box to designate the rule pursuant to which this
Schedule 13G is filed:
     [ ]  Rule 13d-1(b)
     [X]  Rule 13d-1(c)
     [ ]  Rule 13d-1(d)





                              (Page 1 of 12 Pages)
----------------
     *The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.

     The information required in the remainder of this cover page shall not be
deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act
of 1934 ("Act") or otherwise subject to the liabilities of that section of the
Act but shall be subject to all other provisions of the Act (however, see the
Notes).






CUSIP No. 74762E102                 13G                    Page 2 of 12 Pages

----------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                       Tontine Capital Partners, L.P.
-----------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [X]
                                                                  (b)  [ ]
-----------------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                                              Delaware
-----------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                              -0-
SHARES         --------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                                              3,885,031
OWNED BY       --------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                                              -0-
REPORTING      --------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                              3,885,031
-----------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                              3,885,031
-----------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                       [ ]
-----------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                              3.3%
-----------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                              PN
-----------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!






CUSIP No. 74762E102                 13G                    Page 3 of 12 Pages

----------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                       Tontine Capital Management, L.L.C.
-----------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [X]
                                                                  (b)  [ ]
-----------------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                                              Delaware
-----------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                              -0-
SHARES         --------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                                              3,885,031
OWNED BY       --------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                                              -0-
REPORTING      --------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                              3,885,031
-----------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                              3,885,031
-----------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                       [ ]
-----------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                              3.3%
-----------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                              OO
-----------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!






CUSIP No. 74762E102                 13G                    Page 4 of 12 Pages

----------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                           Tontine Partners, L.P.
-----------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [X]
                                                                  (b)  [ ]
-----------------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                                              Delaware
-----------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                              -0-
SHARES         --------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                                              1,274,024
OWNED BY       --------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                                              -0-
REPORTING      --------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                              1,274,024
-----------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                              1,274,024
-----------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                       [ ]
-----------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                              1.1%
-----------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                              OO
-----------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!






CUSIP No. 74762E102                 13G                    Page 5 of 12 Pages

----------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                           Tontine Management, L.L.C.
-----------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [X]
                                                                  (b)  [ ]
-----------------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                                              Delaware
-----------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                              -0-
SHARES         --------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                                              1,274,024
OWNED BY       --------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                                              -0-
REPORTING      --------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                              1,274,024
-----------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                              1,274,024
-----------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                       [ ]
-----------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                              1.1%
-----------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                              OO
-----------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!







CUSIP No. 74762E102                 13G                    Page 6 of 12 Pages

----------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                     Tontine Overseas Associates, L.L.C.
-----------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [X]
                                                                  (b)  [ ]
-----------------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                                              Delaware
-----------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                              -0-
SHARES         --------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                                              1,254,745
OWNED BY       --------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                                              -0-
REPORTING      --------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                              1,254,745
-----------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                              1,254,745
-----------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                       [ ]
-----------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                              1.1%
-----------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                              OO
-----------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!






CUSIP No. 74762E102                 13G                    Page 7 of 12 Pages

----------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                               Jeffrey L. Gendell
-----------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [X]
                                                                  (b)  [ ]
-----------------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                                              United States
-----------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                              -0-
SHARES         --------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                                              6,413,800
OWNED BY       --------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                                              -0-
REPORTING      --------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                              6,413,800
-----------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                              6,413,800
-----------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                       [ ]
-----------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                              5.5%
-----------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                              IN
-----------------------------------------------------------------------------
                     ** SEE INSTRUCTIONS BEFORE FILLING OUT!






CUSIP No. 74762E102                 13G                    Page 8 of 12 Pages

Item 1(a).     Name of Issuer:

     The name of the issuer is Quanta Services, Inc. (the "Company").

Item 1(b).     Address of Issuer's Principal Executive Offices:

     The Company's principal executive offices are located at 1360 Post Oak
Blvd, Suite 2100, Houston, Texas 77056.

Item 2(a).     Name of Person Filing:

     This statement is filed by:

          (i)  Tontine Capital Partners, L.P., a Delaware limited partnership
               ("TCP") with respect to the shares of Common Stock directly owned
               by it;
         (ii)  Tontine Capital Management, L.L.C., a limited liability company
               organized under the laws of the State of Delaware ("TCM"), with
               respect to the shares of Common Stock directly owned by TCP;
        (iii)  Tontine Partners, L.P., a Delaware limited partnership ("TP")
               with respect to the shares of Common Stock directly owned by it;
         (iv)  Tontine Management, L.L.C., a limited liability company organized
               under the laws of the State of Delaware ("TM"), with respect to
               the shares of Common Stock directly owned by TP;
          (v)  Tontine Overseas Associates, L.L.C., a limited liability company
               organized under the laws of the State of Delaware ("TOA"), which
               serves as investment manager to Tontine Overseas Fund, Ltd.
               ("TOF"), a company organized under the laws of the Cayman
               Islands, and to certain managed accounts, with respect to the
               shares of Common Stock directly owned by TOF and the certain
               managed accounts; and
         (vi)  Jeffrey L. Gendell ("Mr. Gendell"), with respect to the shares of
               Common Stock owned directly by TCP, TP, TOF and the managed
               accounts.

          The foregoing persons are hereinafter sometimes collectively referred
          to as the "Reporting Persons." Any disclosures herein with respect to
          persons other than the Reporting Persons are made on information and
          belief after making inquiry to the appropriate party.

Item 2(b).     Address of Principal Business Office or, if None, Residence:

     The address of the business office of each of the Reporting Persons is 55
Railroad Avenue, 3rd Floor, Greenwich, Connecticut 06830.

Item 2(c).     Citizenship:

     TCP and TP are limited partnerships organized under the laws of the State
of Delaware. TCM, TM and TOF are limited liability companies organized under the
laws of the State of Delaware. Mr. Gendell is a United States citizen.

Item 2(d).     Title of Class of Securities:
     Common Stock, no par value (the "Common Stock")






CUSIP No. 74762E102                 13G                   Page 9 of 12 Pages

Item 2(e).  CUSIP Number:  74762E102

Item 3. If this statement is filed pursuant to Rules 13d-1(b) or 13d-2(b) or
(c), check whether the person filing is a:

          (a)  [ ]   Broker or dealer registered under Section 15 of the Act,

          (b)  [ ]   Bank as defined in Section 3(a)(6) of the Act,

          (c)  [ ]   Insurance Company as defined in Section 3(a)(19) of the
                     Act,

          (d)  [ ]   Investment Company registered under Section 8 of the
                     Investment Company Act of 1940,

          (e)  [ ]   Investment Adviser in accordance with
                     Rule 13d-1(b)(1)(ii)(E),

          (f)  [ ]   Employee Benefit Plan or Endowment Fund in accordance with
                     Rule 13d-1(b)(1)(ii)(F),

          (g)  [ ]   Parent Holding Company or control person in accordance
                     with Rule 13d-1(b)(1)(ii)(G),

          (h)  [ ]   Savings Association as defined in Section 3(b) of the
                     Federal Deposit Insurance Act,

          (i)  [ ]   Church Plan that is excluded from the definition of an
                     investment company under Section 3(c)(14) of the Investment
                     Company Act of 1940,

          (j) [ ]    Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

     Not applicable.

Item 4.   Ownership.

     A.   Tontine Capital Partners, L.P.
          (a)  Amount beneficially owned: 3,885,031
          (b)  Percent of class: 3.3% The percentages used herein and in the
rest of Item 4 are calculated based upon the 116,675,077 shares of Common Stock
issued and outstanding as of May 2, 2005, as set forth in the Company's Form
10-Q for the quarterly period ended March 31, 2005.
          (c)(i) Sole power to vote or direct the vote: -0-
            (ii) Shared power to vote or direct the vote: 3,885,031
           (iii) Sole power to dispose or direct the disposition: -0-
            (iv) Shared power to dispose or direct the disposition: 3,885,031






CUSIP No. 74762E102                 13G                   Page 10 of 12 Pages

     B.   Tontine Capital Management, L.L.C.
          (a)  Amount beneficially owned: 3,885,031
          (b)  Percent of class: 3.3%
          (c)(i) Sole power to vote or direct the vote: -0-
            (ii) Shared power to vote or direct the vote: 3,885,031
           (iii) Sole power to dispose or direct the disposition: -0-
            (iv) Shared power to dispose or direct the disposition: 3,885,031

     C.   Tontine Partners, L.P.
          (a)  Amount beneficially owned: 1,274,024
          (b)  Percent of class: 1.1%
          (c)(i) Sole power to vote or direct the vote: -0-
            (ii) Shared power to vote or direct the vote: 1,274,024
           (iii) Sole power to dispose or direct the disposition: -0-
            (iv) Shared power to dispose or direct the disposition: 1,274,024

     D.   Tontine Management, L.L.C.
          (a)  Amount beneficially owned: 1,274,024
          (b)  Percent of class: 1.1%
          (c)(i) Sole power to vote or direct the vote: -0-
            (ii) Shared power to vote or direct the vote: 1,274,024
           (iii) Sole power to dispose or direct the disposition: -0-
            (iv) Shared power to dispose or direct the disposition: 1,274,024

     E.   Tontine Overseas Associates, L.L.C.
          (a)  Amount beneficially owned: 1,254,745
          (b)  Percent of class: 1.1%
          (c)(i) Sole power to vote or direct the vote: -0-
            (ii) Shared power to vote or direct the vote: 1,254,745
           (iii) Sole power to dispose or direct the disposition: -0-
            (iv) Shared power to dispose or direct the disposition: 1,254,745

     F.   Jeffrey L. Gendell
          (a)  Amount beneficially owned: 6,413,800
          (b)  Percent of class: 5.5%
          (c)(i) Sole power to vote or direct the vote: -0-
            (ii) Shared power to vote or direct the vote: 6,413,800
           (iii) Sole power to dispose or direct the disposition: -0-
            (iv) Shared power to dispose or direct the disposition: 6,413,800

Item 5.   Ownership of Five Percent or Less of a Class.

     Not applicable.







CUSIP No. 74762E102                 13G                   Page 11 of 12 Pages

Item 6.     Ownership of More than Five Percent on Behalf of Another Person.

     TCM, the general partner of TCP, has the power to direct the affairs of
TCP, including decisions respecting the disposition of the proceeds from the
sale of the shares. TM, the general partner of TP, has the power to direct the
affairs of TP, including decisions respecting the disposition of the proceeds
from the sale of the shares. Mr. Gendell is the managing member of TM, TCM and
TOA, and in that capacity directs their operations. Each of the clients of TOA
has the power to direct the receipt of dividends from or the proceeds of sale of
such shares.

Item 7.     Identification and Classification of the Subsidiary Which Acquired
the Security Being Reported on by the Parent Holding Company.

     Not applicable.


Item 8.  Identification and Classification of Members of the Group.

     Not applicable.

Item 9.  Notice of Dissolution of Group.

     Not applicable.


Item 10.  Certification.

     Each of the Reporting Persons hereby makes the following certification:

          By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were not acquired and are not held for
the purpose of or with the effect of changing or influencing the control of the
issuer of the securities and were not acquired and are not held in connection
with or as a participant in any transaction having that purpose or effect.







CUSIP No. 74762E102                 13G                   Page 12 of 12 Pages

SIGNATURES

After reasonable inquiry and to the best of our knowledge and belief, the
undersigned certify that the information set forth in this statement is true,
complete and correct.


DATED:  July 28, 2005

                                  /s/ JEFFREY L. GENDELL
                                  ----------------------------------------
                                  Jeffrey L. Gendell, individually, and as
                                  managing member of
                                  Tontine Management, L.L.C.,
                                  general partner of
                                  Tontine Partners, L.P., and as
                                  managing member of
                                  Tontine Capital Management, L.L.C.,
                                  general partner of
                                  Tontine Capital Partners, L.P., and as
                                  managing member of
                                  Tontine Overseas Associates, L.L.C.