Kanchanjunga Apartments Case Study: Plan, Section and Concept (Charles Correa)

Kanchanjunga Apartments is a residential tower on Peddar Road in south Mumbai, designed by Charles Correa and built between 1970 and 1983. It holds 32 flats of four types, from three to six bedrooms, in a block 21 m square and 84 m high, and its idea is simple to state: take the deep verandah of the old Bombay bungalow and lift it into the air as a double-height terrace garden for every flat. Below: the brief, site, concept, plan, section, structure, reception and what designers in India can take from it.

The brief and the client

The Charles Correa Foundation, which looks after his archive, describes Kanchanjunga as "a condominium of 32 luxury apartments of four different types, varying from 3 to 6 bedrooms each". That is the whole published brief: large family flats for well-off buyers in one of Mumbai's most expensive neighbourhoods, stacked in a single tower.

It helps to know what else Correa was doing at the time. The Praemium Imperiale chronology shows he had been in private practice since 1958 and was Chief Architect to CIDCO for New Bombay from 1971 to 1974, the same years Kanchanjunga was being designed. The same page places the tower among his housing in which Le Corbusier's narrow-fronted megaron dwelling was a starting point, "modified by Correa in each instance in order to meet the demands of climate and clientele". The Consulate General of Italy, which occupies part of the building, also names Le Corbusier's Unité d'Habitation in Marseille (1952) as an inspiration.

What the sources do not tell us: who commissioned it, what each flat cost, or how the four types were divided between floors.

Site and context: Peddar Road and the east-west problem

The tower stands at 72 Peddar Road on Cumballa Hill, the address in MIT's Aga Khan Visual Archive and on the Italian consulate's page. The hill sits between the Arabian Sea and the harbour, and that is the problem Correa set out to solve. In the Foundation's words, a building in Bombay "has to be oriented east-west to catch the prevailing sea-breezes, and to open up the best views in the city: the Arabian Sea on one side and the harbour on the other". The catch is that these are "also the directions of the hot sun and the heavy monsoon rains".

A typical Mumbai apartment block answers this with shallow balconies, sunshades and, later, air-conditioning. Kanchanjunga answers it in the section.

Kanchanjunga Apartments concept: the verandah in the air

Correa's starting point was the house type the city already had. The Foundation's text explains that "the old bungalows solved these problems by wrapping a protective layer of verandahs around the main living areas, thus providing the occupants with two lines of defence against the elements". Kanchanjunga is described as "an attempt to apply these principles to a high-rise building".

So each flat gets a deep, two-storey terrace garden. The terrace keeps sun and rain off the rooms behind it (the first line of defence); the rooms sit back behind the glass (the second). From outside, the Foundation says, the tower's "minimalist unbroken surfaces are cut away to open up the double-height terrace gardens at the corners", which hints at "the complex spatial organisation of living spaces" inside.

Writers have since given this a name. Avikal Somvanshi, in Down To Earth (19 June 2015), called Kanchanjunga "a pioneering exercise in bio-climatic design" and recalled that Correa once said "form follows climate". It is the key to the building: the form comes from sun, rain and breeze, not from a facade idea.

Kanchanjunga Apartments plan: a square tower and a central core

In plan the tower is a square of 21 m a side (Foundation). The Consulate General of Italy's page describes a central lift core that carries the lateral loads. The flats are arranged around that core, and the four flat types interlock with each other; the Foundation says these interlocking variations are "expressed externally by the shear end walls that hold up the cantilevers".

For zoning, the simplest reading is three layers:

• The core: lifts and services in the middle, where they need no view or breeze.
• The flats: living rooms and bedrooms around the core, reaching out to the east and west faces.
• The terraces: double-height gardens cut out of the corners, at different corners on different levels, as the Foundation's photographs show.

We have not redrawn the floor plans; they belong to the Correa archive. The Foundation's project page publishes a coloured section and photographs, and our guide to documenting a building for a case study explains how to cite published drawings rather than copy them.

Kanchanjunga Apartments section: how the flats interlock

Kanchanjunga is usually described as a building of split-level flats, and the section is where it makes sense. The diagram below is MOA's reading of the principle, drawn from the published descriptions and the coloured section on the Foundation's page. It is not a copy of Correa's drawing and does not show rooms.

Read it in three steps:

1. Two flats share three levels. One flat runs across the full width on the upper level and drops down on one side; the other runs across the full width on the lower level and rises up on the other side. Internal stairs link each flat's levels.
2. Each flat reaches both faces. Because each one crosses the tower, each gets the sea side and the harbour side, which is what the east-west orientation was for.
3. Each terrace is two storeys high. Where one flat drops down, the space above its lower part opens up as a double-height garden at the corner, shaded by the floor above.

If this sounds like the Unité d'Habitation, it is related: both lock flats together in section. The difference is the purpose. At Kanchanjunga the interlock exists to put a deep, shaded garden in front of the main rooms, against the sun and the monsoon.

Kanchanjunga Apartments structure: shear walls, cantilevers and a slip-formed core

Three published points describe the structure:

• Shear end walls and cantilevers. The Foundation says the shear end walls "hold up the cantilevers", and that these walls also show the interlock of flat types on the outside.
• Reinforced concrete with cantilevered terraces. The Consulate General of Italy describes a reinforced concrete structure with 6.3 m cantilevered open terraces. Its sister page at the Italian Cultural Institute gives the same 6.3 m figure for "interlocking balconies". Neither says whether 6.3 m is a depth or a height, so treat it with care.
• A core built first. The consulate says the central lift core, which takes the lateral loads, was built ahead of the main structure using the slip method, and calls this the first use of slip forming in India for a multistorey building. We did not find an engineering source to confirm the "first in India" claim.

The CTBUH Skyscraper Center lists the tower as all-concrete, with Shirish Patel & Associates Consultants as structural engineer and Larsen & Toubro as contractor.

Kanchanjunga Apartments height and storeys

Height is well agreed: 84 m (Foundation) or 83.8 m (CTBUH). The storey count is not. The CTBUH gives 27 floors above ground, Homegrown (Disha Bijolia, 2023) gives 28, and the two Italian government pages say 32. The height and the 32 flats are firm; give any floor count with its source.

Materials and construction

The building is concrete, and the CTBUH and ArchDaily's AD Classics entry (Brian Pagnotta, 2011) both list concrete as the primary material. The Italian Cultural Institute notes its large white surfaces. The Foundation describes "minimalist unbroken surfaces" cut away at the terraces, with the interlock revealed "through the interlocking form and colour": in its photographs the recessed terraces read darker than the outer walls.

The interest is less in the finish than in the order of building. A slip-formed core going up first, then cantilevered floors and terraces hung off it and the end walls, is a construction sequence worth tracing for any student studying high-rise structure.

Light, climate and services

Kanchanjunga works with Mumbai's climate in three ways, all from the same move:

• Shade: the double-height terrace puts a deep outdoor room between the hot east and west sun and the main living space.
• Rain: the same depth keeps driving monsoon rain away from the glass, which a shallow sunshade on a typical block does far less well.
• Breeze and light: because each flat reaches both faces, it can open to the sea breeze on one side and let air out on the other. This through-ventilation is our reading of the section; the Foundation's text talks about orientation to catch the breeze.

Services sit in the central core, with the lifts. That leaves the perimeter, where the light and air are, for rooms and terraces.

Reception: critics, the RIBA and what has changed

The building has been written about mainly as a climate lesson:

• In the Economic & Political Weekly (11 July 2015), Darryl D'Monte wrote that Kanchanjunga "stands as a sentinel to caution designers" of the city's towers, showing that one can build tall without producing "faceless monstrosities".
• Down To Earth's 2015 tribute (above) called it a pioneering bio-climatic design.
• When Correa gave his archive to the RIBA in 2013, the exhibition that marked it, designed by David Adjaye, used Kanchanjunga images (Dezeen, 23 March 2013). A review on the Transnational Architecture Group blog noted that the Kanchanjunga model stood over 6 ft tall.
• The RIBA had awarded Correa its Royal Gold Medal in 1984, and Peter Murray, then editor of the RIBA Journal, called him "a master of light and shade, of space and climate" (Architectural Record, 17 June 2015).

On problems, we have to be plain: we did not find a dated, named report on leaks, repairs or alterations at Kanchanjunga that we could open and cite. The one visible change in use is that the Consulate General of Italy occupies the 1st to 4th floors. Two fair critical questions follow from the design itself, and we label them as our reading: the building was designed for 32 large luxury flats, so it says little about mass housing, which Correa addressed elsewhere; and internal stairs between levels make flats harder to use for older people or anyone with limited mobility.

What designers in India can take from Kanchanjunga (our reading)

1. Make the outdoor space deep enough to use. A balcony narrower than a chair is a ledge. Kanchanjunga's terrace is a room, and a two-storey one. Even in a small flat, one deep, covered outdoor space beats three shallow ones; our balcony design guide covers the practical side.
2. Solve the climate in section, not with add-ons. Shade, rain protection and cross-ventilation here come from how the flats are stacked, not from fins and films. Test a section for sun angle and rain before you draw the elevation.
3. Give every flat two faces. Through-flats ventilate better than single-aspect flats on a corridor. If a full interlock is too complex, a duplex or a skip-stop arrangement gets part of the benefit.
4. Detail for the monsoon. Deep terraces still need falls, drainage, upstands and waterproofing that survive Mumbai's rain; see building materials for Mumbai and Thane for what suits the coast.

Visiting Kanchanjunga and finding the drawings

Kanchanjunga is a private residential building, and no official source offers visits. The consulate's floors are open only for consular business. You can see the tower from Peddar Road (G. Deshmukh Marg) near Cumballa Hill; please respect the residents' privacy and the consulate's security if you photograph it.

For drawings:

• The Charles Correa Foundation's Kanchanjunga page has Correa's text, a coloured section and photographs. The Foundation, in Fontainhas, Panaji, is the custodian of his professional archive of drawings, models and photographs, much of it digitised.
• The RIBA in London holds the archive he donated in 2013, more than 6,000 drawings according to Dezeen.
• MIT's Dome image archive has a 1985 photograph of the exterior (all rights reserved, so link to it rather than reuse it).

If you are choosing a thesis on housing or high-rise living, Kanchanjunga pairs well with Correa's low-rise Belapur housing and with our thesis topics by typology. Our case studies of IIM Ahmedabad, the Gandhi Smarak Sangrahalaya and the Salk Institute follow the same format.

Working on housing in Mumbai? Find an architect on MOA and see how practices here are designing for the same sun, rain and sea breeze today.

FAQ

Who designed Kanchanjunga Apartments?

Charles Correa (Charles Correa Associates). The CTBUH lists Shirish Patel & Associates Consultants as structural engineer and Larsen & Toubro as contractor.

When was Kanchanjunga Apartments built?

Between 1970 and 1983, according to the Charles Correa Foundation, the Praemium Imperiale and MIT's archive. The CTBUH database gives 1974 as the completion year, so sources differ.

How tall is Kanchanjunga Apartments and how many floors does it have?

About 84 m, on a 21 m square plan (Foundation; the CTBUH says 83.8 m). The CTBUH lists 27 floors above ground; other sources give 28 or 32.

What is the concept of Kanchanjunga Apartments?

To give a high-rise flat the protection of a bungalow verandah. Flats interlock in section so that each has a double-height terrace garden at a corner, shading the rooms from the east and west sun and the monsoon rain while keeping the sea and harbour views and breeze.

Where is Kanchanjunga Apartments located?

At 72 Peddar Road (G. Deshmukh Marg), Cumballa Hill, in south Mumbai, PIN 400 026.

Sources

• Charles Correa Foundation: Kanchanjunga Apartments, Mumbai 1970-83 (accessed 3 Nov 2026)
• Charles Correa Foundation: The Foundation (accessed 3 Nov 2026)
• Consulate General of Italy in Mumbai: La sede (the building) (accessed 3 Nov 2026)
• Italian Cultural Institute, Mumbai: Institute page on the Kanchanjunga building (accessed 3 Nov 2026)
• CTBUH Skyscraper Center: Kanchanjunga Apartments (accessed 3 Nov 2026)
• Japan Art Association, Praemium Imperiale: Laureate: Charles Correa (accessed 3 Nov 2026)
• MIT Libraries, Dome (Aga Khan Visual Archive): Kanchanjunga Apartments, exterior, 1985 (accessed 3 Nov 2026)
• Down To Earth, Avikal Somvanshi: Remembering Charles Correa, one of the pioneers of sustainable architecture, 19 June 2015 (accessed 3 Nov 2026)
• Economic & Political Weekly, Darryl D'Monte, via Architexturez: Correa's Mumbai: Last Burst before the End, Vol. 50, No. 28, 11 July 2015 (accessed 3 Nov 2026)
• Architectural Record, Fred A. Bernstein: Obituary: Charles Correa, 17 June 2015 (accessed 3 Nov 2026)
• Dezeen, Emilie Chalcraft: David Adjaye to design Charles Correa exhibition at RIBA, 23 March 2013 (accessed 3 Nov 2026)
• Transnational Architecture Group: Exhibition review: Charles Correa at the RIBA, 28 April 2014 (accessed 3 Nov 2026)
• ArchDaily, Brian Pagnotta: AD Classics: Kanchanjunga Apartments / Charles Correa, 12 August 2011 (accessed 3 Nov 2026)
• Homegrown, Disha Bijolia: Mumbai's Kanchanjunga Apartments uniquely blend modernism with Indian sensibilities, 27 April 2023 (accessed 3 Nov 2026)