How much does an electric rooflight cost?

The word electric adds three things to the bill of a manual rooflight, and it helps to see them separately. The first is the unit itself, which carries a motor, a chain or spindle mechanism and a control board inside the frame, so it starts higher than the manual equivalent of the same size. The second is the glass, which on any rooflight is the single biggest lever on price and has nothing to do with whether the thing opens by hand or by button. The third is the electrical work, because a mains cable has to reach the unit and be connected by someone competent to sign it off.

Set against those, the labour to form the opening and weather it in is much the same as for a manual rooflight of identical size. You are not paying a large premium for the hole in the roof. You are paying for the motor, the controls and the wiring run, and those are the parts that vary most from one job to the next.

A new or enlarged rooflight is notifiable under Building Regulations, Part L for the thermal side and Part K where safety glazing applies, and that notification is part of a properly costed job rather than an optional extra. We make that Building Control notification on your behalf, so it should appear in the price you are quoted, not arrive later as a surprise.

These are installed figures for the south Essex market, unit and fitting together, before your specific glass choice and any access complications:

The spread inside each row is real, not padding. A cable that reaches from a nearby loft socket is a different job from one that has to be chased across a finished ceiling and made good afterwards. Size drives the rest: double the glazed area and you roughly double the glass cost, which is the part of the bill that moves most.

People assume the electric part is the expensive part. On most jobs the glass costs more than the motor, and on a south-facing roof it should. Southend faces south across the Thames Estuary, so a rear extension here often collects sun from mid-morning until the sun swings west, with reflected light off the water adding to it on a bright day.

That is exactly the situation where an electric rooflight earns its keep, because opening the glass at the highest point of the room lets the hottest air escape without you climbing on anything. It is also the situation where the glass specification matters most. Clear double glazing sits around a G-value of 0.6, meaning it lets roughly 60 per cent of the sun’s heat into the room. Solar-control glass at around 0.3 halves that. On a south-facing kitchen the solar-control unit is the right call, and it adds to the glass cost, which is why two electric rooflights of the same size can be hundreds of pounds apart before anyone has argued about the motor.

So when you compare quotes, read the glass line, not just the total. An electric unit with clear glass on a south-facing flat roof is cheaper on paper and worse to live under. This is the whole basis of our solar-control glazing work, and it is where the extra spend actually changes how the room feels in July.

The headline unit price is rarely the whole story. Budget for these before you sign anything:

• The wiring run and the electrician. If mains power is not already close, the cable has to be run and connected by a competent person and certified. A short run is minor. A long chased run through a plastered ceiling that then needs making good is not.
• Controls. Some units come with a handset, others expect a wall switch or a link to a home system. A rain sensor that closes the unit automatically is standard on many larger rooflights and worth having on any opening one, since an open rooflight in an estuary shower is a wet floor.
• Access. A single-storey rear extension is straightforward. A rooflight two storeys up, or one over a conservatory where a ladder will not reach, may need a tower or scaffold, and that goes on the bill.
• Making good. Forming or enlarging an opening disturbs plaster and sometimes a ceiling line. Plastering, decorating and any structural trimming around the opening are separate from the rooflight itself.

None of these is a hidden cost when it is on the quote. They become one when it is not, so a line-by-line quote is worth more than a lower round number with nothing behind it. For a fuller breakdown across rooflight types, our skylight installation costs page sets out where each element lands.

Work out four things before you ask anyone to price it. Which way the roof faces, whether it is pitched or flat, the rough opening size you have in mind, and how close mains power already is. Those four answers move the figure more than anything else, and having them ready turns a vague estimate into a real one.

If the rooflight opens mainly to clear heat from a room that runs hot, say so, because that steers the glass specification and the choice between one large opening unit and a fixed unit paired with a smaller vent. Our electric skylight installation service covers both, and the right split depends on the room rather than on a catalogue.

When you are ready, tell us the orientation, the roof type and the rough size, and we will come back with a glass specification and a price for the whole job, notification included. Ring 01702 898232 or request a quote, and we will look at the whole roof rather than just the opening in it.