1 On average, the cost of a glass block window is going to depend on the dimensions, specific type or design, and the contractor performing the job. 2  The average glass block window for a residential home will often be between $350 to $550 to install. 3  At The Home Depot, a glass block window that measures 32 in.4  x 14 in. FamilyHandyman.com estimates the cost of DIY glass block basement windows installation to be approximately $20 to $100. 2  Additional costs are also required if there is damage in the siding and framing around the old window frame that requires rebuilding.