Do electric rooflights and skylights need an electrician?

A mains powered unit does. Providing a fused supply to a rooflight is fixed electrical installation work, it is notifiable, and it should be carried out and certificated by a competent electrician. A solar powered unit generally does not, because it carries its own panel and battery and there is no fixed wiring to install.

What the electrician actually does

Provides a supply and terminates it.

A fused connection is taken from a suitable circuit, run to the rooflight position, and terminated at the actuator or its controller, with switching and any control wiring installed alongside.

Why it is notifiable

Because it is new fixed wiring.

Adding a circuit or a new point in a dwelling falls within the electrical safety requirements, and the work is certificated and notified rather than simply done.

What the certificate is for

Evidence, years later.

A certificate is what a buyer’s solicitor asks for and what an insurer would want to see, and it is issued at the time or not at all.

Where the supply comes from

Usually a lighting or a power circuit nearby.

On a kitchen extension there is generally a suitable circuit within reach, and whether it can take the addition is the electrician’s assessment rather than an assumption.

What the actuator needs

Less than people expect.

An opening mechanism draws current for a few seconds at a time, so the load is small and the requirement is a reliable supply rather than a substantial one.

Low voltage systems

Change the cable, not the requirement.

Where a system runs the actuator at low voltage from a transformer, the transformer still needs a mains supply, and that supply is the notifiable part.

Where the cable goes

To the kerb, before it is closed up.

The cable is run to the rooflight upstand while the ceiling is open, left with a tail, and connected once the unit is in.

It is the sequencing that matters rather than the work itself.

Why the timing matters so much

Because a plastered ceiling changes everything.

A cable run through an open ceiling is minutes. The same cable in a finished room is a chase, a patch, a skim and a repaint.

Where that lands is on how much does an electric rooflight cost.

Running a cable you might not use

The advice worth taking.

Where a rooflight is fixed but might one day open, a capped cable at the kerb costs almost nothing and preserves the option entirely.

Where the switch goes

Decided with the room rather than the roof.

A wall switch beside the door, at the same height as the lighting, is the usual arrangement, and it is worth deciding before the walls are finished.

Handsets instead

Convenient and worth having as well rather than instead.

A handset gets lost and a wall switch does not, and most systems support both from the same controller.

The options are on how is an electric rooflight controlled.

The rain sensor wiring

Part of the same first fix. A sensor is mounted at the unit and wired back to the controller, so it is planned with the actuator rather than added as an afterthought.

Integration into a home system

Worth mentioning to the electrician early. Where a rooflight will be controlled alongside lighting or heating, the wiring and the controller choice follow from that, and it is easier to design in than to retrofit.

A solar unit

Where none of this applies. A solar opener carries a panel and a battery on the unit, so there is no supply, no cable and no notifiable work, and it is installed as part of the rooflight.

Where solar is the sensible answer

Any finished room. On an existing roof with a plastered ceiling, solar removes the largest cost and the most disruption, which is usually decisive.

Where mains is better

New work, and anything that has to be reliable.

On a build in progress, a mains supply is cheap to provide, has no battery to think about, and drives heavier units and smoke vents that a solar unit would not.

Smoke ventilation

A different specification entirely. Certified smoke vents run from a dedicated panel with battery backup and their own wiring standards, and that is specialist work.

What it involves is on can a rooflight be a smoke vent.

Who coordinates it

Whoever is running the job, and it needs saying out loud.

The commonest problem on an opening rooflight is that nobody ran the cable, because the roofer assumed the electrician would and the electrician was never told.

Testing and commissioning

A short job at the end and it matters.

The unit is run through its full stroke, the closing seal is checked all round, the sensor is tested with water and the controls are paired and labelled.

A system left uncommissioned is where the calls a month later come from.

What the homeowner is shown

Three things, at handover.

How to operate it from each control, what the sensor will do, and where the isolator is, because somebody will want to switch it off for decorating one day.

Adding a second unit later

Easier if the controller was chosen with that in mind.

A control system that supports more than one actuator lets a second rooflight be added to the same handset, where a single unit controller means a second remote.

That is on can two rooflights open together.

What we agree first

We agree who is running the cable and when, in writing, before the roof is closed, because that single conversation prevents the one mistake on this job that is expensive to correct.

The whole picture is on the electric rooflight installation page.