Exhibit 3.1

AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF

HUTTIG BUILDING PRODUCTS, INC.

ARTICLE I

The name of the corporation (hereinafter called the “Corporation”) is Huttig Building Products, Inc.

ARTICLE II

The address of the Corporation’s registered office in the State of Delaware is 1209 Orange Street, Wilmington, New Castle County, Delaware 19801. The name of the Corporation’s registered agent at such address is The Corporation Trust Company.

ARTICLE III

The purpose or purposes for which the Corporation is organized are to engage in any lawful act or activity for which a corporation may be organized under the General Corporation Law of Delaware.

ARTICLE IV

The total number of shares of all classes of stock which the Corporation shall have authority to issue is 100 shares of common stock, par value $0.01 per share.

ARTICLE V

No director of the Corporation shall be liable to the Corporation or its stockholders for monetary damages for breach of fiduciary duty as a director, except for liability (i) for any breach of the director’s duty of loyalty to the Corporation or its stockholders, (ii) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (iii) under Section 174 of the Delaware General Corporation Law, or (iv) for any transaction from which the director derived an improper personal benefit. If the General Corporation Law of the State of Delaware is hereafter amended to authorize corporate action further limiting or eliminating the personal liability of directors, then the liability of a director to the Corporation shall be limited or eliminated to the fullest extent permitted by the General Corporation Law of the State of Delaware, as so amended from time to time. No repeal or modification of this Article V, directly or by adoption of an inconsistent provision of this Certificate of Incorporation, by the stockholders of the Corporation shall be effective with respect to any cause of action, suit, claim or other matter, that, but for this Article V, would accrue or arise prior to such repeal or modification.