Triple glazing Cost Calculator

Sometimes. In the UK’s relatively mild climate, triple glazing is most worth it for new builds and major renovations, cold or exposed homes, and noisy locations where you want more comfort and less noise. If you already have good A-rated double glazing, the energy saving is small and the payback can run into decades — so it’s better seen as a comfort-and-quality upgrade than a fast money-saver.

Triple glazing typically costs 20–40% more than equivalent double glazing. On a medium uPVC casement that’s often £150–£300 extra per window, and across a whole house it can add £1,500–£4,000 or more. A triple-glazed uPVC casement usually costs £550–£1,200 fitted, versus roughly £450–£900 for double.

In 2026, expect around £3,000–£6,000 for five windows, £4,800–£9,500 for a typical eight-window semi, £7,000–£14,000 for twelve windows and £9,000–£18,000 for fifteen, in standard uPVC. Aluminium adds roughly 20–35% and timber 40–70% or more. Sash windows and bays cost considerably extra.

A little. Upgrading from single glazing or failed old units to triple gives a real saving. But upgrading from good modern double glazing usually saves only around £30–£60 a year for a typical home, because the glass is a small part of total heat loss. If cutting bills is your priority, loft, wall and floor insulation and draught-proofing generally pay back much faster.