After Step 2, we have the price for the window by style, frame and level of manufacturer. Our cost estimator determines install costs by the number of windows selected. Simple inserts adds $65 per window, standard install is $125, full frame is $250 and historic home installation is $200 per window.f you select a casement with a composite frame – $225 + $150 for a total of $375. If you select a double-hung with a vinyl frame – $150 + $100 for a total of $250. If you select a thermal window with a uPVC frame – $175 + $125 for a total of $300.