Do VELUX windows need servicing?

A VELUX window is a sealed glazed unit in a timber or polyurethane frame, hung on a friction hinge, with a rubber gasket running round the sash and a small ventilation flap at the top. There is nothing in that to drain, bleed or recalibrate on a schedule. Manual centre-pivot and top-hung units in particular are close to fit-and-forget. So when people ask about servicing, they are usually asking one of two different questions: what light maintenance keeps the window pleasant to use, and at what point does an ageing unit stop being worth maintaining.

The honest answer is that the window will keep opening and closing whether you look after it or not. The upkeep is about the things around the glass: the gasket that keeps the weather out, the filter that keeps dust from the trickle vent, the hinge that decides whether the sash glides or fights you. None of it is technical. If you can reach the window and hold a cloth, you can do all of it yourself in the time it takes a kettle to boil.

Pick a dry day in spring or autumn and work through the window in order. Most centre-pivot sashes rotate a full 180 degrees and lock with a barrel catch at the bottom of the frame, which brings the outer face of the glass round to the inside so you can reach it without a ladder outside.

• Glass. Rotate the sash, engage the cleaning catch, and wipe both faces with a soft cloth and plain glass cleaner. Grit dragged across the coating is what scratches it, so lift dirt rather than grind it. If the outer pane has a self-cleaning coating, use only water, because detergents interfere with how the coating breaks down grime.
• Air filter. There is a thin foam or mesh filter in the ventilation flap at the head of the frame. Slide it out, rinse it, let it dry, and put it back. A blocked filter is the usual reason a room that used to breathe starts to feel stuffy.
• Gasket and seals. Run a finger round the black rubber gasket on the sash. It should be soft and continuous. Wipe off any dust sitting in the channel, because that is what stops the seal closing cleanly and lets a whistle of draught in.
• Hinges and catches. A drop of light machine oil or a smear of silicone grease on the hinge pivots and the sliding bar keeps the action smooth. Do not oil the friction pads that hold the sash open partway, or it will drop under its own weight.

Two minutes of that a year is the whole of it. Timber-framed units also like a fresh coat of the correct clear lacquer every few years if the room throws a lot of moisture at them, a bathroom or a kitchen especially, because that is what stops the frame taking up damp and swelling.

Powered windows add a motor, a rain sensor and a controller, and those change the picture slightly. The rain sensor sits on the top edge of the sash and closes the window when it gets wet. It collects dust and salt film like everything else on the roof, so give it the same wipe you give the glass, or it starts closing the window on a dry day or missing a shower entirely.

Solar-powered units carry a small battery charged by a panel on the sash. Batteries do not last forever, and a solar VELUX that has stopped responding after years of service usually wants a new battery rather than anything more involved. That is a swap, not a rescue job. If a motor itself fails, or the electronics stop talking to the remote, that is genuinely a job for the manufacturer’s technical line or an electrician, not something to poke at yourself. Internal blinds run on their own springs and cords and generally need nothing beyond dusting.

Maintenance keeps a good unit good. It cannot bring back a sealed glazed unit that has failed. If you see misting or a haze between the panes that no amount of cleaning shifts, the seal around the cavity has gone and the unit has lost its insulating gas. That glass is done, and the answer is a new sealed unit or a new window, which is replacement work rather than anything a cloth will help.

Age shows fastest on the south-facing side of the house, and around here that matters more than most places. Southend faces south across the estuary, so a rear roof window on a 1930s semi can sit under direct sun from mid-morning to late afternoon through the whole summer. That constant heat cycling is hard on gaskets and on the seal round the glass, and it is also the moment the original glazing choice comes back to bite: a clear pane fitted years ago at a G-value near 0.6 will have been baking the room below every July it has been up there. When a tired unit is coming out anyway, that is the sensible point to change the glass specification rather than put the same problem back. A solar-control pane nearer 0.3 blocks most of that summer heat and cuts the glare off the water, and swapping it in while the opening and upstand are already there is the cheapest chance you will get. We deal with that trade-off in our VELUX window installation work, and in more depth on the energy-efficient skylight installation side.

One thing to be clear about: a leak, a cracked pane or a sudden draught after a storm is a roofing matter in the moment, and a roofer is the right first call for making the roof watertight. Replacing the window that failed, and specifying what goes back in, is where we come in.

If your VELUX still opens sweetly and the glass is clear, you have nothing to book. Put the annual once-over on your list, keep the filter and gasket clean, and leave it be. If a unit is misting up, sticking badly, or sitting over a room that overheats every summer, it is worth working out whether a replacement with a better glass specification would pay for itself in comfort.

Tell us the roof orientation and the rough size of the opening and we will come back with a sensible glass specification and a price. Ring 01702 898232 or request a quote, and have a look at our guides if you want to read up first.