Retrofit Trickle Vent Installation in Tunbridge Wells
Background ventilation fitted to existing windows — stops condensation, black mould and tenant complaints. From £50 per vent.
Modern windows are airtight by design — which is exactly why so many homes built or re-glazed in the last decade now suffer with streaming condensation and black mould around the reveals. The fix is mechanical: a small, controllable slot in the top rail that lets stale damp air out and fresh air in, 24/7, without having to crack open a window.
Building Regs Part F ready
Why retrofit trickle vents?
Since the 2022 update to Building Regulations Part F, replacement windows in England usually need to provide at least the same background ventilation as the units they're replacing. For pre-2022 windows that never had vents fitted, retrofitting is the practical solution to chronic condensation, mould around window reveals, and the kind of tenant complaint that turns into a habitability dispute.
- Routed-in trickle vents: CNC-routed slot in the top rail of the sash and frame, fitted with a manufacturer-approved vent body inside and out.
- Equivalent area rated: Vents sized to meet the equivalent area required for the room (typically 4,000–8,000 mm² for habitable rooms).
- Controllable hit-and-miss: Vents close fully in cold snaps and open for steady background flow the rest of the year.
- UPVC and aluminium: We fit on both — aluminium needs a different routing approach to keep the thermal break intact.
- Insect mesh option: External mesh covers available where flies and dust ingress are a concern.
We always quote per window after seeing the installation — wall and ceiling type, frame profile and required equivalent area all influence the right vent.
Why repair, not replace?
Black mould isn't a moisture problem, it's a ventilation problem. Every other intervention — wiping windows, anti-mould paint, a dehumidifier — is treating symptoms. £50–£70 per vent fixes the cause without ripping out the windows.
Clear pricing. No upselling. No pressure. Every job is backed by a written guarantee.
Where we work
We're a mobile service — we come to you. We cover Tunbridge Wells and the surrounding TN postcode towns. If your postcode starts TN1–TN12, we've almost certainly worked on your street.
Tunbridge Wells Hub
Southborough | Rusthall | St John's | High Brooms | Hawkenbury | Langton Green | Speldhurst | Bidborough | Pembury
Tonbridge Hub
Hildenborough | Tonbridge Town Centre
Paddock Wood Hub
Paddock Wood | Brenchley | Horsmonden
Frequently asked questions
Real questions from real customers in Tunbridge Wells and Tonbridge.
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Do trickle vents make the house cold?
No. The vent area is small (typically 4,000–8,000 mm² per window) and the airflow is too low to feel as a draught. Compared with the heat lost through chronic damp walls and mould-stained reveals, the trade is firmly in your favour.
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Can you retrofit to existing UPVC windows without replacing them?
Yes. That's exactly the job. We rout a slot in the existing top rail of both the sash and frame, fit a sealed vent body, and you keep the original windows. No new glass, no new frames.
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Are trickle vents a legal requirement?
For most replacement windows installed in England since June 2022, yes — Building Regulations Part F. For older existing windows there's no retrospective requirement, but landlords can be served improvement notices where lack of ventilation is causing damp and mould.
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Will they make my house less secure?
No. The vent body is integral to the frame and doesn't compromise the locking strip or the glass-retention. Most have a closeable internal flap as well.
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Can you do a whole house in one visit?
Usually yes for terraced houses and flats. Larger detached homes can run to two visits. We quote per window so you know the all-in cost up front.
