Several things can cause a bay window not to shut tightly. In older houses, a bay window meeting may sag and the window frame is no longer square. As a result, the border of the window hits the framework when you try to shut it. But generally, the reason a bay window doesn’t shut tightly is loose hinges or debris that has accumulated in the framework. A sagging bay window should be repaired by a professional. A homeowner may fix minor issues and possess the bay window closing tightly in a quick moment.
Open the window fully. Loosen the accumulation of dirt or debris at the lower edge and sides of the window frame with a utility brush and a plastic putty knife.
Fit a crevice attachment onto a vacuum cleaner hose and connect the hose to the vacuum. Eliminate the residual debris and dirt in the window frame. If the window does not shut tightly or the border rubs on the window frame, then the problem is loose hinges.
Tighten the screws that attach each hinge at the border of the window and the window frame, using a screwdriver. Proceed to the next steps if a screw spins and will not tighten.
Pull the screw. Cut a wooden binder to the hole where the screw was removed, from a wood shim or arbitrary slice of timber, with a utility knife. Slice off a 1/4-inch-wide piece of shim or timber, and cut one end of the piece into a stage.
Insert the pointed end of the wood filler to the hole where the screw was removed. Push the filler tightly to the hole with a hammer. Cut off the extra portion of the filler with the knife. Reinstall the screw and securely tighten it. Repeat the procedure for any screws that do not tighten securely.