Can you convert a manual rooflight to electric?

Retrofit kits

Most major manufacturers make conversion kits for their own manual windows: an actuator that mounts to the existing frame using fixing points already there, with controls.

Whether one exists for yours depends on the model and generation. The code on the data plate answers it, so photograph the plate and send it.

Mains or solar

This is the decision that matters on a retrofit.

Mains means getting a cable to the window in a room that is already finished: lifting flooring or ceiling, chasing for a switch, making good. Frequently the wiring costs more than the kit.

Solar needs nothing. The panel mounts on the sash, the battery sits in the frame, and the whole thing is fitted in an hour or two with no disruption.

For a finished room, solar is usually the right answer and it is why the option exists.

When conversion is not possible

Older windows predating the manufacturer’s electric range, obscure or discontinued brands, and units where the frame has no mounting provision.

Where a window is more than about twenty years old, replacing it with an electric unit is usually better value anyway: you get current glazing, new seals and new hinges rather than a new motor on a worn window.

Flat roof rooflights

Less often convertible. Many fixed flush glazed units are bonded assemblies with no opening provision at all, and there is nothing to motorise. Replacement with an opening unit is the route.

The lesson for new work

Run a capped cable at first fix even if you fit a manual unit. It costs almost nothing and it keeps the cheap option open.

Often yes, with a retrofit kit

Most manufacturers make conversion kits that add a chain actuator to an existing manual roof window without replacing it. Whether one exists for your unit depends on the model and its age, and the data plate tells us in one step.

Where a kit is available, fitting is a couple of hours and nothing on the roof is disturbed at all, because the actuator sits inside on the frame.

The real question is power

Not the motor. Getting electricity to it.

Mains means a cable to the window. Into a finished room that means lifting flooring above or ceiling below, chasing a wall for a switch drop, making good and redecorating, plus an electrician and certification. That frequently costs several times the kit.

Solar avoids all of it. A solar retrofit kit carries its own photovoltaic panel and rechargeable battery and needs no connection at all. For a conversion in a finished room it is usually the sensible answer.

The panel needs daylight rather than direct sun, so it works on a north facing slope and through an English winter, and it keeps working in a power cut.

If a capped cable is already there

Then mains is straightforward and the conversion is cheap. This is why we tell everybody doing any work near a rooflight position to run a capped cable to it even if they are fitting manual units.

Twenty minutes at first fix, terminated in an accessible enclosure, photographed before the ceiling closes. It turns exactly this job from disruptive into trivial.

Where no kit exists

On an older or discontinued model, the choice is between a new motorised window or leaving it manual.

If the unit is over twenty years old the sealed unit is near the end of its life anyway, so replacing the whole window with a motorised one is frequently better value than fitting a motor to something you will replace in three years.

What to specify with the conversion

A rain sensor, because a window that closes itself when it starts raining is a window that actually gets left open. That is the feature that makes a motor worth having.

A wall switch where a cable allows it, positioned beside the light switches at the room entrance rather than under the rooflight.

How to find out

Photograph the data plate on the sash. From that we can tell you whether a kit exists, what it costs and which power option makes sense, without anyone visiting.

Whether the unit supports it

Some do. Several manufacturers design their manual and powered units around the same frame and offer a retrofit actuator kit that fits an existing window.

Others do not, and on those the powered version is a different product with different hinges and a different sash, so there is nothing to convert. The model designation on the data plate settles it.

Age is the practical constraint. A retrofit kit exists for current and recent ranges. On a twenty year old window it usually does not, and by that age the window itself is approaching replacement anyway.

Getting a supply to the unit

The actuator is the easy part. Getting a supply to it is not.

In a finished room, running a cable to a rooflight means either surface trunking, which is visible, or opening up the ceiling and reveal, which means replastering and redecorating.

That is why the cabling, not the motor, is usually what makes a conversion uneconomic.

The solar alternative

Solar powered opening kits solve this directly. A small panel on the outside of the unit charges a battery, and a remote operates it. No cabling at all.

On a retrofit that is nearly always the sensible route, and it is why solar exists as a product category. The trade is a battery with a service life of a few years, and slower operation.

The honest comparison

Against a manual opener on a pole, which costs very little and never fails, powered operation earns its place where the window is genuinely out of reach or where a rain sensor is wanted. Within easy reach, the pole is a better answer.