How Much Does It Cost to Fix Misted Double Glazing in London?
If a window has gone cloudy between the panes, the first question is nearly always the same — how much is this going to cost? Here's an honest, plain-English breakdown of what drives the price of a misted unit replacement in London, based on the jobs we quote every week.
What actually needs replacing
A misted window means the seal around the two (or three) panes of glass has failed and let moisture in. It's the sealed glass unit that's failed, not the frame — so in the vast majority of cases we simply cut out the old unit, fit a new one and re-bead it. The frame stays exactly where it is.
Only where the frame itself is cracked, warped or the reinforcement inside has rusted would a fuller window replacement come into it, and that's a separate conversation to a straightforward unit swap.
What changes the price
Every job is priced on the actual glass needed, so two windows that look similar can come out at different prices.
- Size of the unit — small kitchen or bathroom panes cost less than a large lounge window
- Glass spec — plain clear float glass is cheapest; toughened, Low-E, Georgian bar or obscure privacy glass all add cost
- Shape — square and rectangular units are simplest; bay angles, arched tops and shaped units cost more
- Access — ground floor is quickest; upper floors, conservatories and awkward reveals take longer
- How many units on the same visit — doing several together usually brings the per-unit price down
Indicative price ranges
These are typical ballpark figures for fitted sealed units in London — always confirmed as a fixed price after we've seen a photo or measured up, so treat them as a starting point rather than a quote.
Ways to keep the cost down
A clear photo of the affected window (including a wide shot showing the whole frame) lets us give you an accurate fixed price over the phone before we even visit, which saves a separate measuring trip.
If you've got more than one misted window in the property, getting them all done on the same visit is nearly always cheaper per unit than booking separate callouts.
| Unit type | Typical size | Indicative price (fitted) |
|---|---|---|
| Small pane (bathroom/kitchen) | Up to 0.3m² | £95–£140 |
| Standard casement unit | Around 0.5–1m² | £120–£190 |
| Large lounge/bay unit | Over 1m² | £180–£320 |
| Toughened or Low-E upgrade | Any size | Add approx. £20–£50 |
| Georgian bar or obscure glass | Any size | Add approx. £25–£60 |
Want a professional to handle it?
Get a quoteCall Mark on 07535 916982 or request a callback.
Related repairs we handle
Covering Central London and out to the M25
Frequently asked questions
Is it cheaper to replace the unit or the whole window?
Replacing just the sealed unit is almost always cheaper — usually a fraction of the cost of a full window replacement — because you're keeping the frame, hinges, handles and locks you already have.
Why do prices vary so much between companies?
Glass spec, access and how a company prices their callout all play a part. We quote a fixed price based on the actual unit needed rather than a generic 'from' price that changes once someone's on site.
Can I get an accurate price without a visit?
Often yes — send us a photo of the window (including a wide shot of the frame) and rough measurements, and we can usually give you a fixed price over the phone or WhatsApp.
How long does a misted unit take to source and fit?
Standard sizes are typically ready within 3–5 working days, with the fit itself taking around 45 minutes per unit once the glass arrives.
Call Mark on 07535 916982 or request a callback.