Are There Skylights You Can Walk On?

What a walkable skylight actually is

The words get tangled, so start with them. A skylight is the homeowner's word. A rooflight is what the trade says. A walkable skylight and a walk-on rooflight are the same thing: a glass panel strong enough to carry a person, framed and supported so it sits level with the surface around it.

It is not a normal rooflight with a stronger frame. The glass is built in several bonded layers, the frame is sized for the load, and the roof or floor beneath is made to carry it. Take any one of those away and you do not have something you can stand on.

The panel does two jobs. Above, it is part of the walking surface. Below, it is a window in the ceiling, and straight up is clear: there is no fence, wall or tree between that room and the sky. A side window in the same room might look at a neighbour's brickwork. The pane in the roof looks at weather, cloud and sunrise.

Think of a glass floor in a gallery or a pane in a pavement above a basement. Those are walkable glass. The same engineering, scaled and finished for a house, is what goes into a home terrace. It looks plain from above and feels solid underfoot, and from below it reads as a clean sheet of sky.

Where a walkable pane goes in a house

Three places come up again and again. The first is a flat roof used as a terrace, where a section of glass in the deck lights the kitchen or sitting room beneath. The second is a courtyard or small garden deck, where a pane in the paving lights a lower room with no window to the sky. The third is inside the house, as a glass floor on a landing or mezzanine that passes light from a rooflight above down to the hall.

In Milton Keynes, the flat-roofed rear extension is the natural candidate, because it gives you a roof you may already want to use. Our walk-on rooflights hub sets out each situation in full, with the room-by-room reasoning behind it.

A terrace over a kitchen extension shows the idea best. The island and the table sit in the middle of the room, away from the garden doors, and that is where the light runs out. A pane set above that spot sends a pool of daylight down onto the worktop, while the deck stays flat and usable for chairs and pots. A flat roof that was once just a lid becomes both a place to sit and a source of light.

The same thinking applies to a rear extension with a roof garden, or a garden room whose solid roof shuts out the sky. Where you want a taller glass roof instead of a floor, roof lanterns rise above the ceiling line, and a flat roof rooflight sits low on an upstand when nobody needs to stand on it.

Walkable is not the same as a standard skylight

A sloping roof window or a flat rooflight on an upstand is made to keep weather out and let light in. Nobody is meant to put weight on it. A walkable unit is specified for a load, which means the glass, interlayers, edge support and fixings are chosen to suit what will stand on it.

That is why you cannot take an existing skylight and decide to walk on it. A pane that was never rated for load can fail suddenly. If you want to use a roof as a terrace, the glass needs to be a walkable specification from the start. The detail of the layers is in our guide to walk-on rooflight glass and load ratings, and the load question has its own answer: how much weight a walk-on rooflight can take.

There is a second difference, and it is in the glass itself. A walkable pane is laminated, with more than one toughened sheet bonded into one. The top sheet takes the wear, and the layers beneath carry the load together. Ordinary rooflight glass is built to a lighter standard because its job is lighter.

What you decide before ordering

A few choices shape the product. Each one is easy to settle on a survey, because we can see the roof and the room together. Grip is one of them, and our answer on whether walk-on rooflights are slippery covers the finishes.

Size and structure come next. The opening has to suit the room below, and the roof around it has to carry the pane. Think about use as well: bare feet, furniture and planters all ask different things of the glass.

Fit, finish and cost

A walk-on unit begins with a free survey at your home in Milton Keynes or nearby. We note the opening, study how the roof is built and ask what the pane is for. The fixed written quote that follows stays the same on the day, a 10-year workmanship guarantee is given in writing, and where the work is notifiable the Building Control paperwork is ours to deal with.

Putting the unit in is quick work, a day or two, with the ceiling and reveals below left neat. What moves the figure is covered in walk-on rooflight costs.

Related questions