Short version
Yes. A walk-on rooflight set into a garden, path or light well above a basement or lower-ground room lets daylight reach a space that has little or none. The glass must be rated for what crosses it, the structure around it must be sound, and water needs a planned route away. Because the work alters a structure, Building Control is involved, and we handle the notification where it is notifiable.
How a walk-on rooflight lights a basement
A basement has no roof in the usual sense. Its ceiling is the underside of the ground floor, or a slab under a garden, path or terrace. A walk-on rooflight, also called a basement skylight, replaces a section of that slab or pavement with structural glass, so daylight drops straight into the room below.
Two arrangements are common. In the first, the glass sits at ground level in a path or patio, with a void below it forming a short shaft. In the second, the glass sits at the top of a light well, with the well giving a small sunken space that can also be used for ventilation grilles or access. Either way, the glass is flush with the walking surface or very close to it.
The structure around the opening
Cutting an opening in a slab or in the ground-floor structure changes how loads travel. The edges of the opening need a proper support, such as a reinforced concrete kerb or a steel frame, sized to carry the glass and anything that stands on it. A structural engineer usually designs this, and the calculations go into the Building Control file.
Walls below ground are another point. If the glass sits above a basement wall, the junction between the wall, the new kerb and the damp-proofing needs thought before work starts, so the new detail does not create a path for moisture.
The finish of the glass itself is chosen at the same stage. An anti-slip surface can be specified for glass that is walked on in wet weather, and the panel is laminated, so a damaged outer pane does not drop the load through. Frame, kerb and glass are ordered as one set against the design, which is why the dimensions are fixed in the written plan before the glass goes into production.
- Opening supported by a designed kerb or frame
- Engineer's calculations for the altered structure
- Junction with the basement wall detailed on paper
- Glass rated for the use above it
Drainage for glass at ground level
Glass at garden level takes rainwater like any other surface. The surrounding ground needs a fall away from the panel, and a drainage channel or gully around the edge keeps water moving. If the shaft below has any exposure to the outside, a means of draining it, as well as a seal at the top, has to be planned as part of the design.
Leaves, soil and debris collect around ground-level glass, so a drainage edge that is easy to clear is more useful than one that is tidy but hard to reach. Condensation on the underside is dealt with through the insulating unit and the ventilation of the room, and is discussed at survey.
Load class near paths and drives
The load class is the single biggest choice. Glass in a garden path crossed on foot is rated differently from glass beside a driveway where a car might stray. Domestic walk-on units sit at the makers' usual footfall ratings, and those are for people on foot.
Vehicles are a different matter, and a panel in a drive needs a build-up and a support designed for that use. If a vehicle could reach the glass, tell us at the survey. Our walk-on rooflight load ratings guide explains how the classes are set.
| Location | What to settle |
|---|---|
| Garden path | Foot traffic rating, anti-slip finish |
| Patio or terrace | Furniture loads, surface fall |
| Beside a driveway | Whether any vehicle load is possible |
| Top of a light well | Access, drainage and ventilation |
Building Control and the other permissions
An opening in a ground-floor or basement structure is building work. It touches structure, damp-proofing, thermal performance and, for a habitable basement, fire and escape. We handle the Building Control notification where the work is notifiable, using either the local authority or a registered building control approver.
Planning is a separate question. For a house, glazing set into the ground is often not a rooflight in the permitted development sense at all, so the position depends on the address, and the council decides. We check the permission position for the street and write down what we find. Listed buildings and conservation areas need particular care, and our rooflight planning permission guide sets out how to check.
What the job plan covers
A basement job is the kind where the paperwork is as important as the glass. The plan we write for a Ridgeway Skylights quote lists the panel and its size, then the permission position for the address, then the notification route, the wait for the glass and the day it goes in. For a basement it also records the structural design and how water will leave the area.
A panel like this is usually made to measure, so waiting for the glass takes longer than for a stock roof window, and the opening is prepared before the glass arrives. Knowing both dates in advance lets the groundworks and the glass land in the right order.
Related details sit in flush walk-on rooflights and walk-on glass thickness. The service itself is explained on the walk-on rooflight installation page.
Light levels and what the room needs
A single ground-level panel will not turn a deep basement into a bright room, and it is better to say so plainly. How much daylight arrives depends on the size of the glass, the depth of the shaft, the colour of its walls and how much of the sky the opening can see. Pale, smooth shaft walls reflect more down than dark or rough ones.
Light wells help here. A larger well with a clear view of the sky lets more daylight in than a narrow shaft, and the finish inside it makes a visible difference. We talk through the options at the survey so the room is planned around what the glass can realistically deliver.