EXHIBIT 23.1

Consent of Independent Registered Public Accounting Firm

Plan Administrator and Audit Committee

Coastway Bancorp, Inc.

We consent to the incorporation by reference in the Registration Statement (No. 333-193362) on Form S-8 of Coastway Bancorp, Inc. of our report dated June 17, 2015, with respect to the statements of net assets available for plan benefits of Coastway Community Bank 401(k) Retirement Plan as of December 31, 2014 and 2013, the related statement of changes in net assets available for plan benefits for the year ended December 31, 2014, and the supplementary schedule as of December 31, 2014, which report appears in the December 31, 2014 annual report on Form 11-K of Coastway Community Bank 401(k) Retirement Plan.

/s/ KAHN, LITWIN, RENZA & CO., LTD.

Providence, Rhode Island

June 17, 2015