- Windows must see the light of day. A high density urban site may make daylighting difficult if the windows will not see much sky.
- Typically, sidelighting is governed by the "2.5 Rule," i.e. multiply the height of the window by 2.5 to determine about how far into a space daylighting will reach from that window.
- It is usually better to sidelight from two sides instead of one and to light from as high as possible.
- Strip windows provide more uniform illumination.
- Larger windows require more control.
- Locate windows near room surfaces to help re-distribute daylight.
- Use separate apertures for vision glazing and for daylighting.
- Shaped ceiling and other architectural features can enhance the performance of a daylighting system.
- Glazing must transmit light. A strong desire for very dark glazing generally diminishes the capacity to daylight in all but very sunny climates.
- Building orientation, relative to the path of the sun, becomes important in sidelighting.
- View windows should look at activity or the horizon.