Himachal Pradesh: the house changes its material with the altitude it is built at.
From the foothills to the 6,816 metres of Reo Purgyil, Himachal is a staircase in which every floor builds with what it has: timber and stone where there is forest, earth and willow where it ends. Four rivers, one valley per river and an apple orchard in the middle.
Himachal Pradesh covers 55,673 square kilometres of north-west India, 1.69 % of the country, and packs into that area everything from low hills of about 600 metres to a peak of 6,816 metres, Reo Purgyil, on the eastern edge where the Zanskar range begins. A difference of more than six thousand metres in a state smaller than Croatia is the key to everything else.
01 A staircase of four floors
The relief is arranged from south to north in almost parallel bands. First come the Shivalik hills, the outer ones, at about 600 metres. Behind them lies the Lesser Himalaya, with the Dhauladhar and Pir Panjal ranges, where Churdhar reaches 3,647 metres. Further north and east rises the Great Himalaya, between 5,000 and 6,000 metres, and on the eastern edge the Zanskar range separates Kinnaur and Spiti from the other side of the mountains.
There is no soft transition from one band to the next. In the Kangra valley, a long trough at the foot of the Dhauladhar, a wall of rock rises almost without steps above fields and forest. Moving north is enough to change floors: the state is small on the map and very large in the vertical.
02 Four rivers, four ways of opening the mountain
Four tributaries of the Indus cross the state: the Beas, the Ravi, the Sutlej and the Chenab. The Beas, the Ravi and the Chenab rise or form in the Himachal mountains, and each river has dug its own valley, so the state is organised in several furrows rather than a single axis. The Beas rises at Beas Kund, near Manali, and descends through the Kullu valley. The Ravi rises at Bara Bhangal, in Kangra. The Chandra and the Bhaga rise in Lahaul and meet near Keylong to form the Chandrabhaga, which is the Chenab.
The Sutlej does the opposite: it enters from the far side of the range, near the Shipki La pass, and crosses Kinnaur, collecting the Spiti and the Baspa before heading west. Between one valley and the next there is usually a ridge that can only be crossed by a pass: the Rohtang, at 3,978 metres, links the Beas valley with Lahaul. Each valley is, in practice, its own landscape unit, with its own villages and its own way of building.
03 Where there is forest, the house is timber and stone
On the middle floors, where the mountain still has trees, the kath kuni style dominates, from local words for «wood» and «corner». Walls rise in alternating layers of timber and stone, with no mortar, interlocked corners and wooden pegs (kadil) instead of nails. They are double walls filled with loose stone, and the upper part is often plastered with mud. The roof is slate or wooden shingles.
The house is organised vertically in two or three storeys: animals below, storage in the middle and the living quarters above. And it is not only a matter of layout. Himachal lies in zones IV and V of the Indian seismic map, and IIT Mandi tests on timber joints show that strength depends on how they are assembled and that the contact between timber and stone adds shear capacity. The explanation that is often repeated, that the house sways without breaking, is plausible but is not quantified in the sources I was able to consult.
04 Where the forest ends, the house is earth
The state's forest statistics are misleading. 68.16 % of the area is legally classified as forest (37,948 square kilometres), but the canopy measured by satellite is about 15,443 square kilometres, 27.73 % according to the 2021 Forest Survey of India. The gap between the two figures shows that much land classified as forest has no trees, and in the high north the forest stops appearing.
Spiti is the extreme case. The river, at about 3,700 metres, runs through a wide dry valley between brown mountains. The building tradition here is rammed earth: the walls are mud, stone is kept for foundations because it too is scarce, and timber, mostly willow, poplar and juniper, is used only for beams, floors and door and window frames. The roof is flat, earth over willow branches. Sources attribute this to the combination of a dry climate and scarce timber, and they vary by valley: in lower Spiti there are more materials, in upper Spiti far fewer.
05 What is planted between the two extremes
On the middle floor, between the dense forest and the high desert, there is another layer of built landscape: apple orchards. The popular story says an American missionary, Samuel Stokes, brought them, planting the first trees at Kotgarh in 1916. It is half true: Stokes did not introduce the apple to India and it was already grown in Kullu, but it was his orchard and his persistence that spread commercial growing across the state's middle slopes.
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Himachal Pradesh can then be explained with one gesture: climb and look at what the walls are made of. In the south, wooded hills and a wide valley; in the middle, timber, stone and apples; above, earth and willow. Four rivers and a six-thousand-metre staircase have left on each floor a different way of solving the same problem, which is having a roof under a mountain.
