I met today with someone from a concrete raising company about re-pitching the sidewalk next to my house. When the previous owners installed glass block basement windows, they didn't remove and replace the whole slab where the window sits, but cut away the sidewalk right next to the window -- maybe 5" wide, 2' long, depth unknown -- and filled it in with cement. When the sidewalk is mudjacked up 3", this will leave a 3" deep hole right next to the window, as the window currently sits flush with the sidewalk.
The representative from the company suggested either patching the hole with concrete (using felt against the window to keep it from scratching and later cracking the window) or doing a strong plexiglass patch sealed to the concrete with caulk as another option. His company wouldn't be doing the patching. I would either be doing it myself, or hiring someone else to do so.
What's the best way to fill the hole? Any other tips for this situation?