UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): October 3, 2013 (September 27, 2013)

AMERICAN RESIDENTIAL PROPERTIES, INC.

(Exact name of Registrant as specified in its charter)

7047 East Greenway Parkway, Suite 350

Scottsdale, AZ 85254

(Address of principal executive offices) (Zip code)

(480) 474-4800

(Registrant’s telephone number, including area code)

Not Applicable

(Former name or former address, if changed from last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Item 1.01. Entry into a Material Definitive Agreement.

As previously disclosed, on September 17, 2013, American Residential Properties, Inc. (the “Company”), American Residential Properties OP, L.P., the Company’s operating partnership (the “Operating Partnership”), American Residential GP, LLC, the wholly owned subsidiary of the Company that is the general partner of the Operating Partnership, and American Residential Properties TRS, LLC, a subsidiary of the Operating Partnership, as guarantors, American Residential Leasing Company, LLC, as the borrower, and certain other subsidiaries of the Operating Partnership (the foregoing entities and their consolidated subsidiaries, collectively, “the “Consolidated Group”) entered into an amended and restated credit agreement (the “Credit Agreement”) with a group of lenders for which Bank of America N.A. acts as the administrative agent and letters of credit issuer. Under the terms of the agreement, the Consolidated Group thereunder may increase the amount of borrowings under the senior secured credit facility with additional commitments to increase total commitments by $210 million, to $500 million, without consent of any lenders not participating in such increase, subject to certain customary conditions and lenders committing to provide the increase in funding (the “Accordion”).

Effective September 27, 2013, the Consolidated Group exercised the Accordion in part to increase the aggregate commitments under the Credit Agreement by $50 million (the “Accordion Exercise”). As a result of the Accordion Exercise, the borrowing capacity under the Credit Agreement increased from $290 million to $340 million, subject to meeting certain criteria. All other terms of the Credit Agreement remain unchanged. In order to provide the additional commitment in connection with the Accordion Exercise, Citibank N.A. (the “New Lender”) and Bank of America, N.A., as administrative agent and letters of credit issuer, executed a joinder agreement to provide a $50 million commitment under the Credit Agreement effective September 27, 2013, to include the New Lender in the lending group thereunder, thereby increasing commitments under the Credit Agreement to $340 million.

The foregoing description of the Joinder Agreement does not purport to be complete and is qualified in its entirety by reference to the Joinder Agreement, a copy of which is filed as Exhibit 10.1 to this Current Report on Form 8-K and incorporated herein by reference.

Item 2.03. Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

The information set forth under Item 1.01 of this Current Report on Form 8-K is incorporated herein by reference.

Item 7.01. Regulation FD Disclosure.

On October 3, 2013, the Company issued a press release announcing that it had exercised the Accordion in part. A copy of that press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and incorporated herein by reference.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

SIGNATURES

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

EXHIBIT INDEX