Window Restoration vs Replace Calculator

Cost and tax credit impact for historic window treatment.

Number of windows

Restoration cost each ($)

Replacement cost each ($)

Storm window each ($)

Energy savings/yr/window ($)

Tab to move between fields

Restore + storms ($)

$21,000

Replace all ($)$24,000

Restoration savings ($)$3,000

Replace payback (years)5

Potential HTC loss ($)$4,800

How to Use This Calculator

Enter Number of windows and Restoration cost each ($) — this includes epoxy consolidation, reglaze, weatherstripping, and hardware.
Enter Replacement cost each ($) for the installed cost of new windows sized to match historic openings.
Add Storm window each ($) to the restoration option — interior storm windows add energy performance without harming historic character.
Enter Energy savings/yr/window ($) from improved weather sealing and glazing to calculate the energy payback.
Review Restore + storms total vs Replace all total — restoration is typically less expensive and preserves historic fabric.
Check Potential HTC loss ($) — replacing original windows can jeopardize eligibility for the 20% Historic Tax Credit.

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