-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 CuBgVnXWr2Vp7ji3XFnHX+1x12+wd2dIk5+aA3ONlH+iqQl4j2iWDF5tsbjY7Va4
 bE4ahcX48V4uGfQwyv3B9g==

<SEC-DOCUMENT>0001065645-05-000012.txt : 20050429
<SEC-HEADER>0001065645-05-000012.hdr.sgml : 20050429
<ACCEPTANCE-DATETIME>20050429152745
ACCESSION NUMBER:		0001065645-05-000012
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050429
FILED AS OF DATE:		20050429
DATE AS OF CHANGE:		20050429

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SHAMBAUGH NANCY M
		CENTRAL INDEX KEY:			0001076429
		STANDARD INDUSTRIAL CLASSIFICATION:	LAND SUBDIVIDERS & DEVELOPERS (NO CEMETERIES) [6552]
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-14369
		FILM NUMBER:		05785284

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		3018438600

	MAIL ADDRESS:	
		STREET 1:		222 SMALLWOOD VILLAGE CENTER
		CITY:			ST. CHARLES
		STATE:			MD
		ZIP:			20602

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AMERICAN COMMUNITY PROPERTIES TRUST
		CENTRAL INDEX KEY:			0001065645
		STANDARD INDUSTRIAL CLASSIFICATION:	LAND SUBDIVIDERS & DEVELOPERS (NO CEMETERIES) [6552]
		IRS NUMBER:				522058165
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		222 SMALLWOOD VILLAGE CENTER
		CITY:			ST. CHARLES
		STATE:			MD
		ZIP:			20602
		BUSINESS PHONE:		3018438600

	MAIL ADDRESS:	
		STREET 1:		222 SMALLWOOD VILLAGE CENTER
		CITY:			ST. CHARLES
		STATE:			MD
		ZIP:			20602
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-04-29</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001065645</issuerCik>
        <issuerName>AMERICAN COMMUNITY PROPERTIES TRUST</issuerName>
        <issuerTradingSymbol>APO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001076429</rptOwnerCik>
            <rptOwnerName>SHAMBAUGH NANCY M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>222 SMALLWOOD VILLAGE CENTER</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ST. CHARLES</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>20602</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-04-29</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>175</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>14.8</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>/s/ Nancy M. Shambaugh</signatureName>
        <signatureDate>2005-04-29</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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