Draft article — to be reviewed by the studio before publication.
Designing for natural light
Daylight is the most generous material an architect works with. In Islamabad, where summer sun is fierce and winter sun is welcome, designing with it means deciding where light arrives, when, and how strong.
Start with orientation
In Pakistan the sun moves across the southern sky, so the simplest daylight decision is also the most important: give the main rooms long south-facing walls and keep the plan narrow enough for light to reach the back. A house whose long axis runs east to west can take in low winter sun and still be easy to shade in summer.
The geometry is forgiving. At noon in June the sun stands about 80° above the horizon in Islamabad; in December it is about 33°. A 600 mm overhang directly above a 2.4 m south-facing window shades all of it at midsummer noon, yet leaves more than four-fifths of it in sun at midwinter.
East and west are harder
Morning and evening sun comes in low and cannot be stopped by an overhang. On these faces we reduce glazing, set windows deep in the wall, and use vertical fins, timber screens or a perforated jaali. Trees are often the best answer: deciduous planting on the west shades in summer and lets light through in winter.
Light from above and from the side
A courtyard, a clerestory or a well-placed rooflight can bring daylight into the middle of a deep plan. Light from two sides of a room is calmer than light from one: it softens shadows and reduces the glare of a single bright window in a dark wall. Pale, matte surfaces such as lime plaster then carry that light further.
The aim is not more light, but the right light in the right place at the right hour.
Design it, then test it
We check every project with sun studies at the solstices and equinoxes, at morning, noon and late afternoon. It is a quick exercise that settles arguments early, long before glazing is ordered: which rooms get morning light, where glare will fall on a screen, and whether the terrace is usable on a June evening.
