Window Replacement Cost Calculator

About this calculator

Window replacement cost scales with three independent factors that a rough per-window estimate tends to flatten into one number: how many windows are being replaced, the size of each window (larger openings need more frame and glass), and the glazing type — single glazing is cheapest, double glazing is the common standard for insulation and cost, and triple glazing costs more upfront but cuts heat loss further, with frame material (uPVC, timber, aluminium) adding another layer of price variation on top.

Homeowners planning a window replacement project run this calculation before calling installers specifically to have an independent baseline — installer quotes can vary widely depending on how a company prices size, glazing upgrades and frame material, and knowing a reasonable estimate in advance makes it much easier to spot an inflated quote or negotiate one down.

This calculator takes the number of windows, their size and glazing type, and returns an estimated total replacement cost, so you know roughly what to expect before getting quotes.