A light well is a trench that can be dug out next to the basement wall to allow a window to be created, thus filtering light into the basement.
Light well sizes range from small areas to create a small window, to complete trenches that span a wall. Sometimes these can be enlarged to create a usable outside space.
An internal courtyard, can be similar to a light well. This may be an external area that cuts into the basement space making natural light flow into the area.
A clerestory window is a set of windows above eye level, usually designed to bring light into a space. In terms of basement design, if the exterior ground level permits a set of clerestory windows would allow light to flood into the basement space.
Sun pipes can be a cost effective way of bringing some natural light into the basement. The pipes direct natural light from outside, down the pipes into the basement.
Sun pipes can also be used in roof situations, to bring light into a dark landing or internal room.
A glazed floor can provide light into the basement from either an internal room above, or even an external area.
If the basement has a room above, the glazed floor would be positioned in the light ground level room, transferring that light down to the basement below.
If the basement does not have a room above, but instead has a garden terrace, a glazed floor would be a great feature to the terrace, but also bring in plenty of natural light.
Open up the Garden
If there is a large garden attached the property, it might be possible to open up the basement to the garden. This could be done in a number of ways. The basement level could be opened out to allow exit at basement level, with steps provided, or landscaping to reach the garden level above. If the change in level is gradual it will allow more light into the basement.
Open up the stairs
Opening up the stairs that lead down to the basement may be a way of filtering light down into the basement space.
Check out some of the images below that show how this can be achieved.
Create a New Access
Create an external access point to the basement with an external staircase. This will allow a new area to provide natural lighting, which could be supplemented with glazed walls or even bifold or sliding doors.