    <SEC-DOCUMENT>0001558370-23-006443-index.html : 20230421
    <SEC-HEADER>0001558370-23-006443.hdr.sgml : 20230421
    <ACCEPTANCE-DATETIME>20230421163043
    ACCESSION NUMBER:		0001558370-23-006443
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		47
    FILED AS OF DATE:		20230421
    DATE AS OF CHANGE:		20230421

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Willdan Group, Inc.
    		CENTRAL INDEX KEY:			0001370450
    		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-ENGINEERING SERVICES [8711]
    		IRS NUMBER:				141951112
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1230

    	FILING VALUES:
    		FORM TYPE:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-33076
    		FILM NUMBER:		23836773

    	BUSINESS ADDRESS:
    		STREET 1:		2401 EAST KATELLA AVENUE, SUITE 300
    		CITY:			ANAHEIM
    		STATE:			CA
    		ZIP:			92806
    		BUSINESS PHONE:		800-424-9144

    	MAIL ADDRESS:
    		STREET 1:		2401 EAST KATELLA AVENUE, SUITE 300
    		CITY:			ANAHEIM
    		STATE:			CA
    		ZIP:			92806
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEF 14A
    <SEQUENCE>1
    <FILENAME>wldn-20230608xdef14a.htm
    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: wldn-20230608xdef14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>wldn-20230608xdef14a_a002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: wldn-20230608xdef14a_a002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>wldn-20230608xdef14a_a003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: wldn-20230608xdef14a_a003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>wldn-20230608xdef14a_a004.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: wldn-20230608xdef14a_a004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>wldn-20230608xdef14a_a005.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: wldn-20230608xdef14a_a005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>wldn-20230608xdef14a_a006.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: wldn-20230608xdef14a_a006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>wldn-20230608xdef14a_a007.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: wldn-20230608xdef14a_a007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>wldn-20230608xdef14a_a008.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: wldn-20230608xdef14a_a008.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>wldn-20230608xdef14a_a009.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: wldn-20230608xdef14a_a009.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>wldn-20230608xdef14a_a010.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: wldn-20230608xdef14a_a010.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>wldn-20230608xdef14a_a011.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: wldn-20230608xdef14a_a011.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>wldn-20230608xdef14a_a012.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: wldn-20230608xdef14a_a012.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>wldn-20230608xdef14a_a013.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: wldn-20230608xdef14a_a013.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>wldn-20230608xdef14a_a014.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: wldn-20230608xdef14a_a014.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>wldn-20230608xdef14a_a015.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: wldn-20230608xdef14a_a015.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>wldn-20230608xdef14a_a016.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: wldn-20230608xdef14a_a016.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>wldn-20230608xdef14a_a021.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: wldn-20230608xdef14a_a021.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>wldn-20230608xdef14a_a022.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: wldn-20230608xdef14a_a022.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>wldn-20230608xdef14a_a028.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: wldn-20230608xdef14a_a028.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>wldn-20230608xdef14a_a029.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 20 - file: wldn-20230608xdef14a_a029.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>wldn-20230608xdef14a_a030.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 21 - file: wldn-20230608xdef14a_a030.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>wldn-20230608xdef14a_a031.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 22 - file: wldn-20230608xdef14a_a031.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>23
    <FILENAME>wldn-20230608xdef14a_a032.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 23 - file: wldn-20230608xdef14a_a032.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>24
    <FILENAME>wldn-20230608xdef14a_a033.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 24 - file: wldn-20230608xdef14a_a033.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>25
    <FILENAME>wldn-20230608xdef14a_a034.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 25 - file: wldn-20230608xdef14a_a034.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>26
    <FILENAME>wldn-20230608xdef14a_a035.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 26 - file: wldn-20230608xdef14a_a035.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>27
    <FILENAME>wldn-20230608xdef14a_a036.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 27 - file: wldn-20230608xdef14a_a036.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>28
    <FILENAME>wldn-20230608xdef14a_a037.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 28 - file: wldn-20230608xdef14a_a037.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>29
    <FILENAME>wldn-20230608xdef14a_a038.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 29 - file: wldn-20230608xdef14a_a038.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>30
    <FILENAME>wldn-20230608xdef14a_a039.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 30 - file: wldn-20230608xdef14a_a039.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>31
    <FILENAME>wldn-20230608xdef14a_a040.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 31 - file: wldn-20230608xdef14a_a040.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>32
    <FILENAME>wldn-20230608xdef14a_a041.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 32 - file: wldn-20230608xdef14a_a041.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>33
    <FILENAME>wldn-20230608xdef14a_bg001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 33 - file: wldn-20230608xdef14a_bg001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>34
    <FILENAME>wldn-20230608xdef14a_bg002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 34 - file: wldn-20230608xdef14a_bg002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>35
    <FILENAME>wldn-20230608.xsd
    <DESCRIPTION>EX-101.SCH
    <TEXT>
    Document 35 - file: wldn-20230608.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.DEF
    <SEQUENCE>36
    <FILENAME>wldn-20230608_def.xml
    <DESCRIPTION>EX-101.DEF
    <TEXT>
    Document 36 - file: wldn-20230608_def.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>37
    <FILENAME>wldn-20230608_lab.xml
    <DESCRIPTION>EX-101.LAB
    <TEXT>
    Document 37 - file: wldn-20230608_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>38
    <FILENAME>wldn-20230608_pre.xml
    <DESCRIPTION>EX-101.PRE
    <TEXT>
    Document 38 - file: wldn-20230608_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>39
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 39 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>40
    <FILENAME>R2.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 40 - file: R2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>41
    <FILENAME>wldn-20230608xdef14a_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 41 - file: wldn-20230608xdef14a_htm.html

    Document 41 - RAW XML: wldn-20230608xdef14a_htm.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>42
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 42 - file: Financial_Report.xlsx

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>43
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 43 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>44
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 44 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>45
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 45 - file: FilingSummary.html

    Document 45 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>47
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 47 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>48
    <FILENAME>0001558370-23-006443-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 48 - file: 0001558370-23-006443-xbrl.zip

    </DOCUMENT>
    </SEC-DOCUMENT>