What's actually wrong with your double glazing?
Most "failed" double glazing isn't really failed — it's just one component. The sealed glass unit has lost its argon fill and is fogging up. Or the espagnolette gearbox has worn out. Or the rubber gasket has perished and the sash no longer seals when locked. The frame, the hinges, the cill, the reveal — all fine. Targeted repair runs at 20–30% of the cost of a new window, with no plaster damage and no scaffolding.
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Misted / failed sealed unitDrop-in swap of the failed pane, frame stays in place. Argon, Low-E, toughened matched to original.
from £100
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Stiff handles, broken locks, dropped hingesEspagnolette gearboxes, friction stays, multi-point locks, child-safety restrictors.
from £100
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Draughts & perished sealsQ-Lon & bubble gaskets renewed, hinge compression re-set, threshold seals replaced.
from £60
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Dropped composite, patio & bi-fold doorsCassette-hinge truing, patio rollers, multi-point door lock realignment.
from £80
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Condensation & black mouldRetrofit trickle vents fitted to existing UPVC frames — Part F compliant.
from £50