The short answer
An electric rooflight is worth it when the glass is out of easy reach, when you want it opened every day, or when the room is a bedroom, landing or kitchen where you will use it on impulse. A manual one suits a low, occasional opening. The deciding question is how often a winding pole would actually come out of the cupboard.
The pole test
A manual opening rooflight is only as useful as your willingness to open it. On a flat roof that sits high above a kitchen island or a stairwell, that willingness drops quickly.
A manual skylight opens with a crank handle, a cord, a latch or a long pole that hooks into an eye on the sash. Over a worktop at head height the handle is perfectly comfortable. Over a double-height space, or a loft landing with a steep staircase beneath it, the same unit needs a pole, a clear patch of floor and a free hand. Nobody does that on a warm evening when the room has simply gone stuffy. They put up with it, or they open a window instead.
That is the real comparison. The electric version costs more in the ground, and the manual one costs you a small chore every time. If the chore happens twice a year, the chore is cheap. If it would happen every day from May to September, it is not.
So before anything else, picture the room in July. Where do you stand when you feel it is too warm? Can you reach the sash from there? If the answer is no, the motor is paying for reach as much as for convenience. How the mechanism itself works is set out on our page about how electric opening rooflights work.
Side by side, without the brochure language
Four things separate the two types in daily use: reach, routine, wiring and what happens when something goes wrong.
| Point | Manual | Electric |
|---|---|---|
| Reach | Crank, cord or pole | Switch, remote or keypad |
| Routine | Opened when you remember | Can close on a timer or sensor |
| Wiring | None | Power to the roof opening |
| Fault mode | A stiff handle | A motor or controller to renew |
The table flatters neither side. Manual units have fewer parts to age. Electric units trade that simplicity for being used more.
The case for wiring a motor in
People who fit a motor rarely mention the motor afterwards. They mention that the room stopped getting stuffy, because the rooflight was open at the right moments.
Three situations make the electric choice easy to justify.
- Height. Any rooflight above a stair void, a mezzanine or a tall kitchen extension ceiling is out of reach from the floor. The motor removes the pole.
- Several openings. Two or three opening rooflights in one extension are awkward to manage by hand and simple to group on one control.
- Weather. A rain sensor can close the sash while you are out. A manual sash stays as you left it, and a forgotten pane open on a wet afternoon is how a lovely summer morning ends. Our page on rain sensors on electric rooflights explains how that works.
There is also a quieter benefit. A motor holds the sash at a fixed, repeatable opening and pulls it shut onto the gasket with even pressure. A hand-wound sash is closed by whoever is tired at the time, and a sash that is left just short of fully seated is the one that hums in a gale.
Where manual is the better choice
A manual rooflight is not a lesser product. On the right roof it is the sensible one.
A roof window in a loft bedroom, set low enough to reach from the floor, will be opened by hand with no effort. A small rooflight over a utility room, opened only to clear steam, gains almost nothing from a motor. A rooflight that would be fitted in a place where running a cable means opening up finished plaster, a new ceiling or a sealed flat roof build-up has a hidden cost on top of the motor.
Fewer parts also means fewer things that can wear out and need renewing over the years. A manual stay, well fitted, will simply keep working. If the rooflight is a feature you open only a handful of times a year, the extra complexity has little to do.
One route sits between the two. Some manual units can be motorised later, which is worth knowing if you are undecided. Our answer on whether a manual opening rooflight can be motorised explains what makes that simple or awkward. Planning the cable run at the time of the build is always easier than chasing it afterwards.
What the motor asks of the roof and the wiring
An electric rooflight needs a power supply at the opening. That is the extra the manual version never asks for, and it is worth planning before the roof is closed in.
The supply may be mains-fed through a transformer or a low-voltage feed, depending on the product. Either way, a cable has to reach the upstand, and on a new flat roof that means deciding the route before the insulation and the membrane go on. On a replacement it means finding a path that does not disturb the finished ceiling. Fixed electrical wiring in a dwelling falls under Part P of the Building Regulations, so the electrical work is carried out and notified properly rather than treated as a detail. The page on wiring and powering an electric rooflight goes through the options.
Think, too, about the day the power goes. Most electric units can be operated by hand in an outage, or default to closing, but that depends on the product, so ask before you choose. Our answer on what happens to an electric rooflight in a power cut covers the usual behaviour.
Weighing the extra spend fairly
The fair way to judge the price difference is per use, not per unit.
Take the roof you actually have and count the likely openings in a warm year. A rooflight that would be opened daily in summer and left shut for the rest returns the motor's extra cost in use. One that is opened occasionally does not. The gap depends on size, control and cable run, which are explained on our page about what affects the cost of an electric rooflight. Broader guide ranges sit on the rooflight and skylight costs page.
The written quote shows both versions side by side when you are undecided, so the difference is on paper before you commit. The survey also tells us how high the sash will sit and where a cable could run, which are the two facts that settle most of these decisions.
Motor, pole and loft: the loose ends
Is an electric skylight worth it for a loft room?
If the roof window is reachable from the floor, a manual one is usually enough. If it is set high in a sloping ceiling, or the bed stands beneath it, a motor makes the room far easier to ventilate.
Does a motor make the rooflight noisier?
The motor makes a small mechanical sound only while the sash moves. Once it is closed, the noise you hear comes from the glass and seals, and the glazing build is what we specify for that.
Can I start with manual and upgrade?
Sometimes. It depends on the unit and whether power can reach the upstand. Decide the cable route at installation, even if you fit the motor later, because it is much easier before the roof is finished.
Will an electric rooflight last as long as a manual one?
The glass and frame last the same. The motor is an extra component that may be renewed separately in time, so a well chosen, properly supplied unit is worth more than the cheapest one.
If you are still weighing it up, get a quote and tell us which room it is for. The wider range is on our electric and opening rooflight installation page, and the quiet spec is described on the quiet spec page.