A method and apparatus for forming cast-in-place window well walls includes first and second forming panel modules each having an inner and outer section. The forming panel modules may be connected together by a spacer panel which extends downwardly to a footing for providing a pier for supporting the window well wall. The forming panel modules are preferably configured with arcuate corners and upper and lower rails to permit stacking of the modules to increase the height of the window well wall, or include additional spacer panels or filler forms to increase the width or thickness of the window well wall.