Sangath Case Study: Plan, Section and Vaults (B V Doshi)

Sangath is B V Doshi's own architecture studio in Ahmedabad, built from January 1979 and in use from early 1980. It is a cluster of low vaults finished in broken white china mosaic, with studios sunk below the garden, grassy steps that climb onto the roof, and water channels and ponds in the garden. This case study covers the brief, site, plan, section and vault build-up, the materials, how it deals with Ahmedabad's heat, what critics said, and what Indian designers can learn from it.

The brief: an architect as his own client

Sangath was never a normal office brief. A 1980 project sheet published by the Vastu Shilpa Foundation says the building departs from the usual architectural office because it also holds a research centre and community-related facilities. The same sheet says Doshi, "acting as his own client", could express his ideas about community cooperation and individual expression, which is why so many activities sit together on one site.

Doshi's earlier project sheet (dated 1979, held in the Architexturez South Asia archive) lists three users: the architectural office, a private trust, and related activities. The name explains the intent. The Pritzker Prize jury citation (2018) says Sangath is a Sanskrit word meaning "to accompany or to move together"; the Vitra Design Museum's 2019 exhibition text calls it Gujarati. Either way, the practice's own project page describes the place as an expression of Doshi's idea of "moving together".

Doshi later described it, in his Pritzker biography, as "an ongoing school where one learns, unlearn and relearns". The Vitra text adds that the studio can be turned into a concert hall or lecture hall overnight, and that three generations of Doshi's family were working there side by side in 2019.

Site and context: Thaltej, then and now

The site is at Thaltej, on the road Architectural Record's 2023 tribute calls Drive-In Road. Doshi's sheet gives a 2,425 m² plot, about five times the floor area, which is why the garden carries so much of the design.

Ahmedabad is hot and dry for most of the year, with a short, heavy monsoon. The Vastu Shilpa Foundation's sheet calls Sangath an attempt to evolve structures and forms "suited to the local climate and which evoke a local ethos". The city has since grown around it. The Vitra Design Museum's text describes it surrounded by new high-rises and the elevated metro line.

Sangath design concept: a building as landscape

The vault came first by accident. In a passage quoted on his 1979 sheet, Doshi explains that it "owes its origin to a happy accident". He was designing a small outhouse on the site and a contractor friend could only supply curved corrugated asbestos sheets. Passers-by, his gardener and colleagues responded to the result, and Doshi saw that the proportions of the curved roof to its supports resembled Indian temples and traditional head-dresses. The sheet notes that vaults were used minimally early in the design and became the main feature later.

Three ideas carry the scheme:

• Sink the building. Doshi took Sangath "deeper into the ground" to lower its height, which made the vaults more dominant (1979 sheet).
• Use the roof. The level change made room for stepped seating for lectures and slide shows, which leads up to a terrace from which the vaults rise. The practice's page calls this "imagining the building as a landscape", with the roof as "a series of terraces that can be walked over".
• Make the garden the other half of the building. The same page describes the garden as "a composite of many smaller gardens" at different levels, and says the campus "is as much about the garden as the building".

The Foundation's text on Hidden Architecture reads the complex as a summary of Doshi's earlier work and lists borrowings: Le Corbusier's ear-shaped pool, amphitheatre steps like Aalto's and Wright's, Gaudí's broken mosaic, and a water feature like the channel at Kahn's Salk Institute (see our Salk Institute case study). The Vitra text adds that memories of his childhood home and of Le Corbusier's Paris studio are fused in the building.

Sangath plan: zones and the route through them

Doshi's sheet describes an ensemble of vaulted and flat-roofed buildings arranged around a court. The Foundation's 1980 sheet says the plan "combines smaller spaces for more personalised activities with larger ones" for the studios, and that a separate access to the studios comes through a basement-level entry.

The route matters as much as the rooms. Following the Foundation's description on Hidden Architecture:

1. From the gate, a vault silhouette shows behind an outer wall, with a glimpse of the inside through a small break.
2. The path turns off the north-south axis and runs along the garden walls, so the entrance sits at the end of an angled approach.
3. The entrance drops a few steps down into a vault. From there a stair rises about three storeys, or a short corridor leads past Doshi's office.
4. The corridor opens into the drafting hall, where the ceiling rises. At its far end, the opening first seen from the gate restores the main axis.

The Foundation describes this as interlocking spaces of different heights to create compression and release. For students, the lesson is that a small building can feel larger when the route is long, turns, and changes level.

This is a relationship diagram, not a floor plan. For Doshi's own plans and sketches, see the sources under Visiting below.

Sangath section and wall section: how the vaults are built

People searching for the "Sangath wall section" or "roof plan" usually want the vault build-up. Doshi's 1979 sheet gives it:

• Frame: post-and-beam with brick infill and reinforced concrete slabs.
• Vaults: ferro-concrete cavity vaults cast in situ using "a mobile or 'sliding' formwork".
• Insulation: round clay tiles (nalia in Gujarati) to provide insulation.
• Cover: a hand-plastered cement layer.
• Finish: broken china mosaic cladding.

The Foundation's 1980 sheet describes it more briefly as vaults "of insulated hollow tiles, finished externally with broken white glazed tiles". The two descriptions agree on the principle: a clay layer for insulation between the structure and a white skin. They differ on whether the clay tiles sit on a concrete shell or form part of it. If you document the building, cite one and note the other. Inside, according to the Foundation's text, the drafting hall's vault underside is textured concrete that spreads natural light.

No published source we found gives the depth of the sunken floor, the vault span or the layer thicknesses, so the diagram shows none. Do not label a studio sheet with numbers you cannot cite.

Materials and construction: low-tech and semi-experimental

Doshi's sheet says the work was done "on a semi-experimental basis, using local materials and semi-skilled labourers". The Foundation's sheet adds that low-technology methods and energy-related elements are built into the design and decoration, and that recycled materials are used "in both an energy-related and decorative way".

The mosaic is the clearest case. According to the Foundation, the broken white tile finish "recycles waste material and reflects incident sunlight thus minimising heat absorption". It also explains the look: white, slightly broken surfaces that read differently in sun, rain and moonlight. The Foundation's text mentions the moon reflected in the ponds and across the mosaic at night.

The sheets record a short, overlapping programme: design from 1976, construction from January 1979, occupation in early 1980 with work still going on. For the regional context of these materials, see our guide to building materials in Ahmedabad and Gujarat.

Light, climate and water

The Pritzker Prize announcement of 7 March 2018 sums up the climate strategy in one line: "Vaulted roofs, porcelain mosaic tile coverings, grassy areas, and sunken spaces mitigate extreme heat." The sources describe four parts:

• Reflect. The white mosaic reflects incident sunlight (Foundation, 1980).
• Insulate. The clay layer in the vault slows heat gain, and the sunken rooms are insulated by clay within the structure (Foundation text on Hidden Architecture).
• Bury. Grassy mounds and the sunk floor put earth against the walls (Hidden Architecture; practice page).
• Light without glare. The interior is lit by "North-light from glazed ends of the vaults, reflected East light and direct light caught by glass tiles" (Foundation, 1980).

Water is part of the garden: the Foundation describes "flowing water details", water channels and reflecting ponds. Many student case studies go further and say the vaults and roof channels carry rainwater through cascades to a pond that waters the garden. We did not find that route in the Foundation's or Doshi's own texts, so check it on site or with the studio before you put it on a sheet. The practice's page lists "recycling waste" among the building's strategies, without detail. For terrace finishes by climate today, see our roofing materials guide.

Reception: what critics and the jury said

Sangath was central to Doshi's 2018 Pritzker Prize. The jury wrote that in "the architect's own studio, called Sangath" one can see "the outstanding qualities of Balkrishna Doshi's approach and understanding of architecture", and noted "an easy flow of terraces, reflecting ponds, mounds, and the curved vaults".

The historian William J R Curtis, in his obituary of Doshi (credited to The Guardian and reproduced by ADA magazine), described the studio "half buried in the ground under insulated concrete vaults" and as the point where "modernism meets a sophisticated peasantism". Dezeen (Amy Frearson, 2017) describes a partly subterranean building organised around a garden, with "barrel-vaulted roofs covered in porcelain mosaic tiles". The Vitra Design Museum's retrospective, "Balkrishna Doshi: Architecture for the People" (opened March 2019), presented it among his key works.

On problems: we found no dated, named source reporting leaks, major repairs or alterations to the vaults. That is a gap in the published record, not proof that there have been none. The change that is documented is the city around it: high-rises and the metro line (Vitra, 2019). Doshi died in Ahmedabad in January 2023, aged 95 (Architectural Record), and the studio continues as Vastushilpa Sangath LLP.

What designers in India can take from Sangath

These are our reading, not claims from the sources.

1. Lower the building before you add cooling. Sinking a floor and banking earth against the walls cuts the exposed surface in a hot, dry city. On an Indian site, check the water table, design drainage around the sunken floor and waterproof the retaining walls before anything else. Our waterproofing guide by climate covers the basement details.
2. Treat the roof as two jobs: insulate, then reflect. Sangath separates a clay insulating layer from a white reflective skin. On an ordinary RCC terrace the same logic applies: an insulating layer first, then a light, reflective finish that can be repaired piece by piece, as broken mosaic can.
3. Give the roof and the steps a use. Sangath's steps are a lecture hall and its roof is a terrace people walk on. A studio, school or clubhouse in India can gain an outdoor room for the cost of making the roof safe and accessible.
4. Build a prototype with your own site team. Doshi's vault came from an outhouse built with what a contractor had, and the building was built semi-experimentally with semi-skilled labour. A full-size mock-up of one bay, before you commit to the rest, is cheap insurance.

If you are documenting Sangath for a studio, our guide on how to do an architecture case study gives a sheet layout and field checklist. Doshi's Amdavad ni Gufa, a later half-buried building in the same city, gets its own case study in this series, as does IIM Ahmedabad.

Visiting Sangath and seeing the drawings

Sangath is a working architecture office. The practice's Contact and Location page gives the address and contact details. It publishes no visiting hours or fees, so write to the studio before you go and do not expect a gallery.

Doshi's drawings, sketches and archive are held by the Vastushilpa Foundation. The Architexturez archive reproduces the 1979 and 1980 project sheets, Doshi's sketches and photographs, all credited to the Foundation: start with the 1980 Sangath document.

Looking for an architect who works with climate the way Sangath does? Find an architect on MOA.

FAQ

Who designed Sangath in Ahmedabad?

Balkrishna V. Doshi (B V Doshi) designed it as his own studio, acting as his own client. It houses his practice, now Vastushilpa Sangath LLP, and the Vastushilpa Foundation.

When was Sangath built?

Construction began in January 1979 and the building was occupied in early 1980 while work continued, per Doshi's project sheet. The Pritzker jury dates it 1980; the practice's website and some press give 1981.

What does Sangath mean?

Moving together or accompanying. The Pritzker jury calls it a Sanskrit word; the Vitra Design Museum calls it Gujarati.

What is the Sangath roof made of?

Ferro-concrete cavity vaults cast on a sliding formwork, covered with round clay tiles for insulation, a hand-plastered cement layer and broken white china mosaic, according to Doshi's 1979 sheet.

Why is Sangath sunk into the ground?

To lower its height so the vaults dominate, to create stepped outdoor seating that leads to the roof terrace, and, with the mounds and mosaic, to keep the interiors cooler in Ahmedabad's heat.

Sources

• Architexturez South Asia: Doshi, Balkrishna V., Sangath, architect's office and research centre under construction, Vastu-Shilpa Consultants, 1979: site and floor area, dates, cost, structure, vault build-up, Doshi's account of the vault and the sunken section (accessed 3 Nov 2026)
• Architexturez South Asia: Doshi, Balkrishna V., Sangath, architect's office and research centre in Ahmedabad, Vastu Shilpa Foundation, 1980: brief, climate intent, hollow-tile vaults, light, recycled finish, basement entry (accessed 3 Nov 2026)
• Vastushilpa Sangath LLP: Sangath, Ahmedabad project page: year, area, roof as terraces, gardens, passive strategies (accessed 3 Nov 2026)
• Vastushilpa Sangath LLP: Contact and Location (accessed 3 Nov 2026)
• Hidden Architecture: Sangath Office, text by the Vastushilpa Foundation: route, materials, climate, references (accessed 3 Nov 2026)
• The Pritzker Architecture Prize: Balkrishna Doshi, 2018 Laureate, with jury citation, announcement and biography (accessed 3 Nov 2026)
• Architexturez South Asia: "Balkrishna Doshi: Architecture for the People" exhibition at Vitra Design Museum, exhibition text, 25 March 2019 (accessed 3 Nov 2026)
• Dezeen, Amy Frearson: Key projects by influential Indian architect Balkrishna Doshi, 10 July 2017 (accessed 3 Nov 2026)
• Architectural Record, Sean Anderson: Tribute: Balkrishna Doshi (1927-2023), 25 January 2023 (accessed 3 Nov 2026)
• ADA magazine: Balkrishna Vithaldas Doshi, obituary by William J R Curtis credited to The Guardian (accessed 3 Nov 2026)
• MIT Libraries, Dome (Aga Khan visual archive): Sangath, record dating the building 1979 to 1980 (accessed 3 Nov 2026)
• Vastushilpa Foundation: Balkrishna Doshi Archives (accessed 3 Nov 2026)