A common site conversation goes like this. The plasterer is standing under a new opening in a high-ceilinged kitchen extension, the homeowner is holding a brochure, and somebody asks whether the rooflight should wind open or open on a switch. It sounds like a small choice about convenience, but it affects the cable runs, the order, the budget and how the room works for the next twenty years.
The right answer depends less on taste than on a handful of plain facts: how far the unit is from the floor, whether anyone will be able to reach it, whether there is a power supply close enough, and how soon the roof needs its glass. We take them in that order below, section by section, and finish with a room-by-room view. If you want the wider range first, the electric opening rooflights page is the hub for this topic.
How manual units open
A manual opening rooflight is moved by hand. On a pitched roof window, the sash usually has a handle along its lower edge, and you lift it to swing or pivot the glass open. On a flat rooflight, the opening is typically worked by a winder handle or crank, a pole with a hook that engages a catch, or a latch and gas-strut arrangement that holds the glass at set positions.
The strengths are simple. There is no motor, no control box and no cable. Nothing needs to be wired, and nothing depends on a power supply being present on the day the glass arrives. If the roof is already built and the ceiling finished, a manual unit slots into a clean opening without anyone chasing plaster.
The limits are about effort and reach. A heavy flat rooflight on a crank needs a few turns, and the person turning it must stand beneath it, within arm's length of the mechanism. A pole works for a unit above head height but needs somewhere to stand it, and in a busy kitchen it tends to go missing. Opening can be fiddly with wet hands or small children underfoot. Manual units also tend to be left in one position, so people open them less often than they intend.
None of this is a reason to avoid manual. A loft bedroom with a roof window set where the handle falls naturally to hand is a classic use. It is when the unit is out of reach, or when the room has little other ventilation and you want to adjust it often, that a motor begins to earn its place. The same goes for a household where one person does most of the opening and closing: a switch spreads that job around.
How electric units open
An electric rooflight carries a small motor, called an actuator, that raises and lowers the glass. You operate it with a wall switch, a remote handset or, on some systems, a connected control. The glass lifts on its arms while the weather seal stays attached to the kerb, and it returns to the closed position at the touch of the same control.
The advantage is plain in a high or awkward position. A large lantern above a double-height kitchen, or a unit above a staircase, is out of reach by any reasonable pole. With a switch, everyone in the house can open it, including the person who cannot stretch. Electric units also make it far likelier that the rooflight is used. It takes a second to open a window for steam, so people do.
Electric units can also work with a rain sensor that closes the glass when the first drops fall. We cover how that behaves in the guide to rain sensors. And they raise questions that manual units do not, such as what to expect in a power cut, which is answered in what happens to an electric rooflight in a power cut.
The trade-offs are cost, complexity and a moving part to look after. A motor adds to the unit price, the wiring adds electrician time, and the control needs a place on the wall that suits the room. The cost of an electric rooflight sets out what goes into a quote without quoting figures out of context.
Reach and ceiling height
Reach is the first practical test, and it is easy to run on site. Stand where the person using the unit would stand, put a hand up to the point where the handle or catch would be, and ask whether that is comfortable for every adult in the house. If it is not, a pole or a motor is needed.
In a loft conversion, the sloping ceiling often brings a roof window within easy reach, and a manual handle is usually fine. A flat roof over a ground-floor extension is a different case. A kitchen extension with a flat ceiling at normal height and a rooflight set at the centre of the room puts the opening several steps from the walls, and a high handle there will not be used.
A short reach check
- Can the least tall adult comfortably operate the handle or pole from the floor?
- Will furniture, a worktop or an island stand under the opening and block the way?
- Is the unit over stairs or a void, where nobody can stand below it?
- Would a person with limited strength or grip be asked to open it?
If the answer to any of those is yes, the unit should be electric or, at minimum, pole-operated with a clear place to store the pole. In a room where the unit sits above a bath, a hob or a shower, an electric control also keeps wet hands off a winder. We note the intended operating position in the survey, and it goes into the quote with the unit.
Height matters for a second reason, which is where the warm air collects. A rooflight is most useful as a vent when it sits at the highest point of the room, and that is often the very place a hand cannot reach. Hot, damp air rises to meet the opening, so a unit in the ceiling lets that air out where a side window cannot. The more the room relies on that effect, the stronger the case for a control that is easy to use.
Wiring and solar options
Electric does not always mean a cable. There are three broad routes, and they suit different stages of a build.
| Type | Power | Best when |
|---|---|---|
| Manual | None | The unit is within reach, or the ceiling is finished |
| Mains electric | Wired supply and control | The walls are open and the electrician can run a cable |
| Solar electric | Panel and battery in the unit | Wiring is awkward or the plaster is done |
A mains unit needs a cable from a supply point to the rooflight, and a switch or control in a convenient spot. It is much simpler at first fix, when the electrician is on site anyway and the plasterboard is still off, than after decorating. What the cable needs is set out in the wiring guide for electricians, and whether a qualified electrician has to do the work is covered in the electrician answer.
A solar unit charges its own battery from a small panel and needs no cable. It is a neat route for a roof that is already covered or a ceiling that is already painted. The limit is daylight: a heavily shaded rooflight needs its battery state watched more closely. A solar unit is not a way to avoid thinking about power, only a way to avoid running a cable.
There is also a middle case worth naming. A mains unit can be wired to a single switch for the room, or to a control that also drives a rain sensor and, on some systems, other openings. Each extra function adds a conductor or a setting to agree with the electrician, so the list of what the control must do belongs in the specification before first fix. Our quote lists the control alongside the unit, so the builder can pass it straight on.
Lead times
Lead times are laid down by the maker, not by the installer, and they are different for different units. A motorised unit is often assembled to order with its actuator, control and sensor, so its lead time can differ from that of the same unit supplied for hand opening. Every quote names the lead time for the specific product chosen, and the maker confirms it after ordering.
This is where the choice meets the programme. If the roof will be ready for glass in a given week, the order has to be placed early enough for the unit to arrive by then. Making a late switch from manual to electric restarts the order and can leave the opening covered by a temporary roof while everyone waits. That is the reason we ask for the decision at the quote stage, and why we tie the order to the roof date once the build programme is known.
There is a second timing point on site. Electric units need first-fix work, which means the electrician must have run the cable before the plasterer closes up. A manual unit does not make that demand. If the plasterer is booked next week and the cable is not in, either the decision or the sequence has to change. Our fitter talks to each trade ahead of their visit, so the cable, the covering and the plaster reveals each happen in a sensible order.
For a view of how the supply side behaves generally, the guide to rooflight lead times explains what drives the wait.
Which suits which room
Room use is the last filter. It often settles the matter on its own.
| Room | Usual choice | Why |
|---|---|---|
| Kitchen extension | Electric | Steam and cooking heat; the unit is often out of reach |
| Open-plan living space | Electric | A large unit over a high ceiling |
| Loft bedroom | Manual | The handle falls to hand on a sloping ceiling |
| Bathroom or shower room | Either | Electric if the unit is high; manual if within reach |
| Landing or stairwell | Electric | Nobody can stand beneath to reach it |
A kitchen asks the most of an opening rooflight because heat, steam and cooking smells rise straight to it. A switch near the hob and the doors means the unit gets used. A quiet loft bedroom, by contrast, may need opening once a day, and a handle does that for no extra cost or maintenance. Bathrooms sit in between: a small bathroom under a sloping ceiling suits a handle, while a larger one with a high flat roof is better served by a switch placed away from the shower.
A last note for builders: whichever type is chosen, the kerb and opening sizes depend on the exact unit, not on the category. We send those dimensions in writing for the specific product before the roof structure is built, so the opening is right whichever way it operates. Opening a flat rooflight to reach the roof is a separate matter, and the roof access answer explains where that does and does not apply.
Smaller points on choosing
- Can a manual rooflight be changed to electric later?
- That depends on the make. Some systems let a motor be added to a suitable unit, but many manual units are a different product from the electric version, so the safe route is to decide before ordering. Ask the maker about your model.
- Do electric units still open by hand?
- Behaviour varies by model. Some can be moved with a manual release when the power is off, others cannot. The power cut answer on this site covers what to check before you buy.
