We carry out opening vent and actuator repairs in Llangefni and across the LL77 area. Opening vents in roof lanterns are usually driven by a chain actuator on a switch, remote or rain sensor.

What you might be seeing
- Vent stops part-way or makes grinding noises
- Leaks from around a closed vent
- Remote or switch unresponsive
Why it happens
Actuator failure
Chain actuators wear out or jam, especially if they've been forced.
Power or control faults
Transformers, control units, switches and remotes fail; we check these first.
About Llangefni and the LL77 area
Damp, mild winters keep moss and algae growing on flat roofs and lantern frames, which holds water against seals and blocks weep slots. Regular clearing makes a real difference in wetter areas.
Near the coast, salt in the air is hard on aluminium finishes and fixings; washing the frame occasionally and touching in chips keeps corrosion away.
Llangefni is around 8 miles from Bangor, Gwynedd, and both are within our Gwynedd coverage.
Close by, we also cover Bangor, Gwynedd (8 miles), Caernarfon (8 miles), Holyhead (14 miles).
How much should it cost?
Guide price for opening vent and actuator repairs: £195–£545 ex VAT (£234–£654 inc VAT), per vent. Towers or scaffold, where needed, are priced into the quote. Your fixed price is confirmed in writing before any work starts.
Do you need permission in Wales?
In Wales, like-for-like repairs to a roof lantern don't usually involve building control. A full replacement or a bigger opening is controlled under the Building Regulations 2010 (as applied in Wales), so we set out the route in writing first. Listed buildings in Wales need listed building consent from the local planning authority for alterations, with Cadw guidance on historic buildings; check with the council before changing a lantern on a listed property.
How does it work?
- Send photosWhatsApp or upload a few photos and tell us when it leaks.
- Guide priceWe reply with a guide price and whether a visit is needed.
- Fixed price in writingYou approve the price and the date before anything starts.
- Repair and testWe fix what's failed, water-test where it matters, and send photos.
Opening vent and actuator repairs in Llangefni: questions
Do you need to visit to price opening vent and actuator repairs?
Not always. Clear photos are often enough for a guide price. Where the cause isn't obvious, a visit to inspect and water-test is charged from £145 ex VAT, confirmed before we come.
Can you repair a lantern someone else installed in Llangefni?
Yes. We repair lanterns whoever fitted them. If yours is still under the installer's warranty, contact them first so you don't affect it.
Can you add a vent to a lantern that doesn't have one?
Some lanterns can take a replacement vent unit in place of a fixed pane; it depends on the system. We'll check.
Can you add a rain sensor?
Often, if the actuator and control are compatible.
Other lantern repairs in Llangefni
- Roof lantern resealing in Llangefni
- Flat roof junction and flashing repairs in Llangefni
- Slipped glass panel repairs in Llangefni
- Condensation diagnosis and fixes in Llangefni
- Timber roof lantern repairs in Llangefni
- Leak investigation and inspection in Llangefni
Opening vent and actuator repairs near Llangefni
More about opening vent and actuator repairs · All roof lantern repairs in Llangefni