Swahili interior design: what the records show and how rooms are finished

What Swahili interior design is built from

A paper by Ulrich Malisius, published by ICOMOS, looks at the rooms of Stone Town houses. In its words, the thick walls, together “with niches, arches and pillars”, create “a specific atmosphere and interior architecture” (ICOMOS, checked on 13 November 2026).

How we start a Swahili interior on a new house

We begin with the walls and leave the furniture for later. Niches and arches are settled on the drawings together with the wall finish, because each one changes the blockwork and the plastering. Room layouts are covered in our guide to Swahili house design, and walls and structure in the guide to Swahili architecture.

Lime plaster and limewash on the walls

The Aga Khan Trust for Culture guidelines for Stone Town state that lime putty was the binder used to build the town (Aga Khan Trust for Culture, checked on 13 November 2026). They add that lime plaster lets moisture in a wall evaporate, while cement render traps it.

Plaster goes on in coats, and the top coat is only 3 to 5 mm⁠⁴ thick, so it follows the render coat beneath. Chapter 5 of the guidelines adds that the texture of Zanzibar's historic render points to a top coat applied with small rounded steel trowels. Such a trowel leaves a flat but undulating surface.

Chapter 1 of the guidelines asks for limewash or paint that can breathe on plaster, not oil paint. It also says never to repair lime plaster with cement.

What this means for the wall finish in a new build

We ask early whether you want a lime finish or a standard painted render. The choice changes who does the plastering and when. If you choose lime, you approve a sample panel before any room is plastered. The paint for each wall is then written into the schedule.

Wall niches (zidaka) and what they held

Earlier work on later Swahili houses in Lamu, Kenya (Donley-Reid, as summarised by Wynne-Jones 2013) found that the innermost rooms carried the richest ornament. Those rooms held the zidaka, “systems of niches used for the display of objects or lamps” (Wynne-Jones, checked on 13 November 2026).

Planning niches before the walls go up

A niche takes its depth from the wall, so we fix the position and size of each one on the wall drawings before blockwork starts. We ask what each niche will hold: a lamp needs a cable run, and plates need a shelf at the right height. In an old house, original niches stay open, and structural work goes into an estimate for renovation in Zanzibar.

Ceilings carried on mangrove poles (boriti)

Chapter 2 of the Aga Khan Trust for Culture guidelines describes the boritis, mangrove poles laid at close centres across the wall heads and over the rooms below. Small pieces of marine coral bridged the gaps between them (Aga Khan Trust for Culture, checked on 13 November 2026). The same chapter says the poles help keep the walls upright. Pole spans and lengths from other studies are set out in our guide to Swahili architecture.

Exposed poles under a modern slab

If you want the look of a boriti ceiling, we first settle with the structural engineer whether the poles carry load or are fixed under the slab as a finish. Their spacing and the ceiling height then go onto the section drawings. We confirm the timber supply before the poles enter the estimate. Light fittings are drawn between the poles.

How we fit out a Swahili-style interior

Carved doors in museum collections

A Swahili door at the Minneapolis Institute of Art dates from the mid-19th century⁠⁷. Its record ties it to an “international style” that developed in Zanzibar in that century (Minneapolis Institute of Art, checked on 13 November 2026). That style drew on the African continent, Gujarat, the Red Sea and the Persian Gulf.

The Metropolitan Museum of Art holds a carved Swahili door of wood and brass, 270 cm⁠⁸ high, made by a Zanzibar-based artist. The museum dates it to the mid- to late-19th century⁠⁸ (The Met, checked on 13 November 2026).

Planning a carved door in the fit-out

We size the opening around the door. First we ask whether it is new work made to drawings or an old door to repair: an old door is measured and a new one is drawn. The frame and threshold follow from those dimensions. The joiner starts once the hinges and lock are agreed, along with the finish of the inner face. A carved door adds its own lines to an estimate; see how a building estimate is put together.

Furniture and mats in museum records

In Stirling, the Smith Art Gallery and Museum holds a high-backed chair, the kiti cha enzi. Its record gives Zanzibar as the production place, and its description dates such chairs to the 19th century⁠⁹ (museum record, checked on 13 November 2026). They were, it says, “manufactured in workshops in places such as Mombasa, Lamu and Zanzibar”. This one has a dark hardwood frame pegged together, woven string panels on the back, seat and footrest, and ivory inlay.

The Kenya National Archives record on Swahili beds says their headboards were carved in lattice-like patterns similar to chairs, or set with lacwork pegs in the crossbars. Turned legs were painted with bands of “lacwork”, a lacquer-like vegetable colouring. The record credits this tradition to artisans on the Pate Islands, above all at Siyu (Kenya National Archives, checked on 13 November 2026).

The Penn Museum holds a palm-leaf mat from Zanzibar, dated 1895–1920⁠¹¹ (Penn Museum, checked on 13 November 2026). It is 254 cm⁠¹¹ long, with dark and light fibres forming a geometric pattern.

Choosing pieces for a new room

Large pieces go on the furniture plan first, before sockets and lights, because a carved bed or a chair with a footrest needs clear floor around it. Carved pieces are made to drawings or taken from what you own, and inlay is chosen from samples, never ivory. The full sequence is on our page about interior design and fit-out in Zanzibar.

Colour: Stone Town facade rules and the interior

Chapter 1 of the guidelines asks that outside colours blend with the tones of the town (Aga Khan Trust for Culture, checked on 13 November 2026). It lists white, light blue and light yellow for walls, and green, blue or clear finishes for joinery. Bright colours on new buildings are ruled out, and white limewash is noted for reflecting sunlight. None of the sources we read sets a colour rule for interior walls.

How we build the palette

Those lists cover Stone Town facades. We agree the interior palette with you, starting from the wall finish and the wood tone, then adding fabrics and mats. For a house in Stone Town, we read the guidelines first; the permit rules are summarised in our guide to building permits in Zanzibar.