Bigger windows of course admit more daylight, but it is also worth considering having more, smaller windows as a better overall effect can be achieved (see above).

• Using one roof window would allow daylight to light approximately 46% of this room
• Using two roof windows with a combined total surface area of the previous window would allow daylight to light approximately 48% of this room
• But four roof windows with the same combined total surface area distributed more evenly would allow daylight to light approximately 65% of this room!

You can also let more light into the room by using the right lining. If the lining is vertical below the window, and horizontal above the window, you can allow more light to enter the room.

Correctly splayed reveals allow more light to enter the room.
Incorrectly splayed reveals trap warm air and may cause condensation. Correctly splayed reveals trap warm air to circulate freely around the room.

You can also admit more light into the room by using the correct lining. If the lining is vertical below the window, and horizontal above the window, you allow more light to enter the room.

In addition to internal light and design, you should also consider what visual impact the roof windows will have on your house from the outside. Remember to consider the roof windows’ position in relation to existing windows in the house. Then try to balance the need for internal light with the external architecture. By doing this your roof windows will look elegant from the outside and perform according to your needs on the inside.

Using a snow guard above your roof window(s) is always recommended to prevent permanent damage.

Before buying a blind you have to think about why you need a blind, so you can decide which blind type best suits your needs. In the picture you can see the effect of each blind on light and warmth.

Always make sure to wear suitable protective equipment during installation. You can normally complete the installation of a roof window from the inside of the house, and scaffolding is therefore not considered necessary. However, as with all construction, there is a risk that objects might be dropped from the roof (hammer, tiles, etc). We therefore recommend that you never leave any objects lying on the external face of the roof, and that any areas at risk should be sectioned off to minimise the risk.

It is recommended that you wear safety masks and goggles when cutting any internal materials in the roof or when cutting tiles. It is also advisable to use temporary support battens whilst placing the window frame.