Abstract: A security well cover to be mounted on a window well. The window well has an upright arcuate wall with a semi-circular window well bead. The security well cover has a five-sided angular flange structure with five upright sides all having a common cover radius slightly larger than a window well radius for seated engagement on top of a semi-circular window well bead. An elongated rear closure plate is joined at opposite ends of the closure plate to opposite ends of the five-sided angular flange structure or suitable welds. A piece of wire mesh is sized to act as a closure for the security well cover. Outer margins of the mesh are attached to the five-sided angular flange structure and to the elongated rear closure plate in unitary assembly therewith. The security well cover is sized to rest on top of a semi-circular window well. Manually disengageable latchable brackets are secured to an underside of the cover and are accessible only from an underside of the window well cover.