Zanzibar architecture: Stone Town's houses, streets and doors

Zanzibar architecture: one town, several building traditions

Zanzibar architecture, in the sources we read, centres on Stone Town. John Makunza's 2017 engineering study calls it “the old city and cultural heart of Zanzibar Town” (Tanzania Journal of Engineering and Technology, checked on 13 November 2026). A 1997 brochure by the Aga Khan Trust for Culture traces its building types to African, Arab, Indian and European origins (Aga Khan Trust for Culture, checked on 13 November 2026).

The brochure says this mix formed within one hundred and fifty years⁠². In some parts of town the original imports can still be told apart; elsewhere builders borrowed forms, and newcomers adapted existing buildings to their taste. For the brochure, it is the synthesis of these influences, not any single one, that makes architecture in Zanzibar distinct.

A conference paper from the University of Notre Dame starts earlier and sets out five waves of influence behind these layers. The first left Swahili-style wattle and daub homes; the third, under the Omani Sultans, brought multi-storey coral stone buildings with flat roofs. A fourth wave saw an influx of Indian traders and a new mixed-use building type (ACSA proceedings, checked on 13 November 2026).

What this means for a new villa

We start a villa brief by asking which part of that mix you want: a plain white facade with a carved door, a timber gallery, a roof terrace or a courtyard plan. The answer changes the drawings, so it comes before the first sketch. Room layouts are covered in our guide to Swahili house design.

Stone Town Zanzibar architecture: the masonry town and its repairs

Ulrich Malisius, an architect writing in May 1987, describes the old town in a paper published by ICOMOS. He names coral stone laid in lime mortar as the basic material. He lists the upkeep the houses need: yearly whitewashing, checks on mangrove poles, replacing broken roof sheets and gutters. Once water gets in, he writes, a building decays very quickly (ICOMOS, checked on 13 November 2026).

Makunza puts the town's stone masonry buildings at around 1,709⁠³, most of them plastered and then lime-washed. He observes that the stone units on facades still appear sound, but the mortar, plaster and render are badly deteriorated (Makunza, checked on 13 November 2026). Coral stone and lime along the whole coast are covered in our guide to Swahili architecture.

What we take from it on site

We write the wall build-up and the plaster finish into the estimate line by line, so you see which parts follow the old town. For a lime-washed finish, we agree a sample panel with you first. If a wall is concrete block with lime plaster, the estimate line says so.

Narrow streets of Stone Town, Zanzibar, and the bazaar pattern

The narrow, winding bazaar street was the main pattern of the town, Malisius writes, with shops on the ground floor and homes on the floors above (ICOMOS, checked on 13 November 2026). The Trust's brochure traces a walk through the streets of Stone Town in Zanzibar. It leads from the sea front buildings through the crowded Indian bazaars into quieter, narrower residential lanes (Aga Khan Trust for Culture, checked on 13 November 2026).

Why the street edge matters on a villa plot

On a villa plot outside the old town, we decide early how the house meets the lane. We mark the entrance and the boundary wall on the site plan. The first plan also shows whether a ground-floor room opens to the street.

Doors: carved timber at the entrance

For doors in Stone Town, the ICOMOS paper illustrates “one of the famous carved Zanzibar doors”. It also describes a restoration pilot from 1983: a bazaar-street house in Arabic style with timber decorations and a door of Indian style. Its carved door and decorations were restored (ICOMOS, checked on 13 November 2026).

An image record at MIT Libraries describes a carved Indian-style wooden door on the House of Wonders (MIT Libraries, checked on 13 November 2026). That building is covered in our guide to Zanzibar buildings.

Planning a carved door in a new house

We ask whether you want a new carving or already hold an old door. An old door is measured as it stands, and we draw the opening to fit it. The carver's quotation becomes its own line under windows and doors, one of the sections in how an estimate is built.

Galleries, balustrades and verandas in Stone Town

The 1983 pilot house from the doors section also revived an old feature. It received an internal stair and gallery in traditional design, with balustrades of carved East African teak. Malisius calls the stair probably the first of its type in three decades⁠¹, because concrete had replaced timber (ICOMOS, checked on 13 November 2026).

Elsewhere he records wooden shutters swapped for glass louvres, balustrades for asbestos sheets, and lime plaster decoration spoilt by rough cement plaster (ICOMOS, checked on 13 November 2026). The Notre Dame paper links the wave of Indian traders with “airy verandas and intricate detailing” (ACSA proceedings, checked on 13 November 2026).

Timber details on a new villa

Balustrades and veranda posts are drawn with the facade from the start. We agree the wood with you and show you a finished sample before ordering.

Omani architecture in Stone Town, Zanzibar

Malisius writes that Arabs from Oman drove the Portuguese from the region, and that in 1832 their Sultan decided to move his capital to Zanzibar. They brought their own style of architecture, but the building materials were local (ICOMOS, checked on 13 November 2026). The Omani Sultans and rich Indian merchants built their palaces and government buildings on the sea front (Aga Khan Trust for Culture, checked on 13 November 2026).

Reading the Omani layer in a villa brief

“Omani style” can mean many things in a brief. We ask for photos of the buildings you have in mind, then mark what to carry over: facade proportions, the door, window shutters, a roof terrace.

Who looks after Stone Town and its building rules

The ICOMOS paper dates the Stone Town Conservation and Development Authority (STCDA) to 1985 (ICOMOS, checked on 13 November 2026). It now works under the Stone Town Conservation and Development Act No. 3 of 1994, according to a government framework of November 2025 (BIG-Z framework, checked on 13 November 2026). Between June 1992 and July 1994 the Aga Khan Trust for Culture prepared a Stone Town Conservation Plan with the Authority (Aga Khan Trust for Culture, checked on 13 November 2026).

The same framework describes the STCDA's role as approving conservation and development projects in the old town. It adds that all works in the area need STCDA approval before they start (BIG-Z framework, checked on 13 November 2026). Current approval rules are set out in our guide to the building permit in Zanzibar.

For Makunza, World Heritage status makes the town a conserved area. He cites a general principle of conservation: restore buildings with similar materials and design (Makunza, checked on 13 November 2026).

What we do before work in the old town

For any job inside the conservation area, we first ask the STCDA which approvals apply, then start drawing. We do not promise an outcome. Work on an old house falls under our renovation service in Zanzibar.

Using Zanzibar architecture in a new villa

Our villa construction in Zanzibar service covers the whole build, from the first drawing to handover. You can drop any old-town detail once you see its price.