How much does an electric rooflight cost?

The unit

An electric opening version carries a premium over a fixed unit of the same size for the actuator, the control gear and the heavier frame and hinges. Add a rain sensor and a wall switch and the premium grows modestly.

This part is predictable and comparable between quotations.

The wiring

This is where the range is.

During a build, at first fix: a few metres of cable clipped to a joist before the plasterboard. Twenty minutes.

Into a finished room: lifting flooring above or ceiling below, chasing for a switch drop, making good, redecorating. A day and a half plus decoration.

The same window, the same actuator, and a completely different job.

Solar as the alternative

Where the room is finished, a solar powered opener usually costs less overall than running a new circuit, because there is no wiring at all. It opens more slowly and costs more than a mains unit, and it is frequently the right answer on a retrofit.

Converting a manual unit

Some manual windows accept a retrofit opener kit rather than needing replacement. Whether yours does depends on the model and generation, which the code on the data plate tells us.

Where it is possible it is far cheaper than a new window.

The false economy

Fitting manual during a build to save the electric premium, then wanting a motor two years later. The wiring alone typically costs more than the upgrade would have.

Run the cable at first fix even if you fit manual. It costs almost nothing.

Two costs, and only one is predictable

The unit premium for a motorised rooflight over a manual one is modest and comparable between suppliers. The wiring is where the range is, and it can easily exceed the premium several times over.

The premium on the unit itself

A motorised version carries a premium for the actuator, the control gear and the heavier frame and hinges needed to carry a powered sash. Add a rain sensor and a wall switch and the premium grows modestly.

This part of a quotation is straightforward to compare between installers.

The electrical work

During a build or a loft conversion at first fix, a cable to the rooflight position is a few metres clipped to a joist before the plasterboard goes on: twenty minutes of work.

Into a finished room it means lifting flooring above or ceiling below, chasing a wall for the switch drop, making good and redecorating: a day and a half plus decoration, plus an electrician’s time and certification.

Same window, same actuator, completely different job. This single factor explains almost all the variation in electric rooflight quotations.

Solar, which sidesteps it

A solar powered opener carries its own panel and battery and needs no mains connection at all. Fitting is a couple of hours with no disruption below and no electrician.

The unit costs more than a mains motorised one, and on a retrofit into a finished room it is almost always cheaper overall, frequently by a large margin.

The advice that saves the most money

If any work is being done near the rooflight position, run a capped cable to it even if you are fitting a manual unit. It costs almost nothing at first fix, it is terminated in an accessible enclosure, and it turns a future upgrade from a disruptive job into a cheap one.

Photograph where it is before the ceiling closes. The single most common regret in this trade is saving the electric premium during a build and wanting a motor two years later.

What else to budget for

A rain sensor, which we include as standard rather than as an option, because a window that closes itself when it starts raining is a window that actually gets left open.

A wall switch, which needs a cable and therefore has to be decided at first fix. It is the control people skip and then wish they had, because a handheld remote is permanently in another room.

And the actuator’s eventual replacement, at ten to fifteen years. It is the shortest lived component and a serviceable part that unbolts and is swapped for a fraction of the cost of a new window.

What is being paid for beyond the glass

An electric rooflight is a fixed rooflight plus an actuator, a control system, a power supply and a gasket that has to work every cycle for twenty years. Each of those is a real cost.

The actuator and control system are the obvious part. The less obvious parts are the electrical work and the sequencing.

The electrical line

A supply has to reach the unit, and running that cable while the roof is open is straightforward. Running it afterwards means opening a finished ceiling, which is why deciding on a powered unit before installation matters so much more than it does for most accessories.

The work is notifiable electrical work and needs certifying, which is a further line.

Options that move the number

Solar operation removes the cabling entirely, at the cost of a battery with a service life of a few years. On a retrofit where cabling would mean opening a ceiling, it is frequently the cheaper answer overall.

A rain sensor is a small addition at installation and worth having on almost any powered unit.

Battery backup matters where the unit forms part of a ventilation or smoke strategy and is optional otherwise.

Grouping and controls add little in hardware and need planning before the cable runs go in.

Where the value is

On a unit that is out of reach, powered operation is not a luxury; it is the difference between a rooflight that gets used and one that stays shut. On a unit within easy reach, a manual opener does the same job for considerably less.