How to repair concrete window ledge?

Here is a site that will help with replacing a concrete sill l that is not broken off all the way under the window. If it is broken under the window, it would probably require taking the window out to repair.

Hope this helps.

http://www.leucht.com/blog/2007/02/replacement-of-window-sill-on-block-exterior-wall/

If you have the pieces just clean off any loose mortar from the block. Use mortar mix on the block and replace the pieces. Any cracks can be sealed with the mortar mix or cement based caulk.

Check with Lowes or Home Depot, they will know.

Howi

And take care of the drain problem. Gutter may be clogged, or you may not have any gutters. See if you can extend the eaves another 8-16”. Use metal flashing if you need to. For the ledge, if you want cheap and easy, relatively speaking, use a piece of metal or plastic gutter with 90* corners. Use cement or waterproof construction glue to attach the gutter to the window ledge, then paint the gutter to match the other ledges, or paint them all a different matching color to update the house. Gray would look modern. ☺️

The sill supports the window. Don't let it go too long. If you don't want to hire a mason, get a concrete sill cut to size and mortar it in, thoroughly cleaning out all dirt and sand before you begin.