Short answer
Because lime was a protective coat before it was a colour. Limewash sheds rain, lets a wall dry out and hides rough or soft masonry, and plain limewash is white; tints came only from the few earth pigments cheap enough to add. Where the reasons are documented they are practical and local — rubble walls in Pembrokeshire and Scotland, coral rag in Zanzibar, water-collecting roofs in Bermuda — and in one documented case, Willemstad, white was banned.
Conservation bodies describe limewash in functional terms. Historic Environment Scotland's study of external lime finishes says the lime coat, whether harling, render or limewash, protected masonry from driving rain, wind and frost and gave elevations a bright, even finish, and that limewash is sacrificial and needs regular renewal. Suffolk's planning authorities call it the principal finish for plaster in the county up to the twentieth century, note that it lets a wall breathe so damp can evaporate, and record that walls were traditionally limewashed every year. In Pembrokeshire the national park authority explains that most buildings used rough local stone 'probably never meant to be seen', covered with colour washes and renders to hide it and keep the building watertight.
Plain limewash gives bright white walls. Variety meant adding earth pigments, and the Pembrokeshire guidance lists what that produced: reds from the palest pink to deep maroon, and yellows as a range of creams. It also records how they were used — a strict hierarchy on a farmstead, with the farmhouse coloured red or yellow, the principal outbuildings white and lesser buildings left as bare stone. Suffolk's guidance reaches a similar conclusion from thinner evidence: the pigments historically used in limewash appear to have given pastel colours or earth tones, with some sign that blue cost more and so appeared mainly on higher-status buildings.
Colour here signalled rank within a single farm. The same white that marks an outbuilding in Pembrokeshire is the whole point of a roof in Bermuda.
Outside Britain the documented reasons are equally material. UNESCO's statement for the Stone Town of Zanzibar describes buildings of coralline ragstone and mangrove timber, set in thick lime mortar and then plastered and lime-washed. For St George's in Bermuda it says that because of the nature of the soft limestone still used for construction, walls and roofs are white-washed, and that because fresh water is scarce the white roofs and their pitch are designed to collect rain into cisterns. In both places the white surface is the working face of the building, and the stone beneath is not on show.
Whitewash is not always the tradition a heritage body protects. UNESCO dates the colourful buildings of Willemstad, on Curaçao, to 1817, when the previous style of white lime finish on exteriors was prohibited — 'apparently', in its own careful wording, to protect eyesight from the glare. The predominant colours since are red, blue, yellow ochre and shades of green. The case is useful for two reasons. It shows that a white settlement and a coloured one can be the same building tradition on either side of a rule; and it shows a careful source separating the date, which it states, from the reason, which it hedges.
Much stone now on view was once coated. The Scottish study says that as limewash and harling wear away, or are deliberately stripped and the joints repointed, the result is a modern aesthetic of exposed rubble that differs from how buildings appeared in the past and leaves them less protected. Pembrokeshire's guidance makes the same point to owners: the modern fashion of showing off the stonework of simple old buildings is usually inappropriate, practically and visually. A palette taken from the present appearance of a 'stone' village may therefore describe a twentieth-century preference for bare masonry.
The record thins quickly. Suffolk's own guidance states that there is limited evidence for the colours used on its buildings before colour photography, with 'some evidence' for Suffolk Pink and for earlier red or ochre finishes on barns; it does not endorse any recipe for the pink. The white and blue villages of the Cyclades are absent from this page on purpose. Colourwise located no regulation or dated account it could read for them, and the explanations repeated online are not reproduced here without one. None of the authorities cited publishes a colour reference for its limewash colours: they describe them in words.
| Place | Scope | Material | Colour, in the source's words | Why | Provenance |
|---|---|---|---|---|---|
| Sentier des Ocres, Roussillon | Single site or quarry | Natural ochre: kaolin and quartz coloured by goethite and haematite | Pale yellow to dark red — CIELAB L* 36.5–61.4, a* 12.7–20.3, b* 25.0–40.3 | Goethite gives yellow and haematite red. The study found the yellow–blue coordinate tracking goethite content and the red–green coordinate tracking haematite, with opposite signs. | Measured (moderate) |
| Falun | Single site or quarry | Falu red pigment | Light red at about 500 °C, darker at 700 °C, towards black above 950 °C | Iron sulphides in low-grade copper ore weather to yellow limonite. Roasting drives off water and converts it to red iron oxide; the kiln temperature sets the shade. | Documented (strong) |
| Siena | Single site or quarry | Raw and burnt sienna | Yellowish-brown raw; reddish-brown when burnt | A clay coloured by limonite and goethite with a little manganese oxide. Heating dehydrates them partly to haematite, which is the change from raw to burnt. | Documented (moderate) |
| Umbria (disputed) | Region or island | Raw and burnt umber | Brown, varying towards yellow, red or green; very dark when burnt | An earth with more manganese oxide than sienna, which darkens and cools the brown; burning shifts the iron towards haematite. | Documented (limited) |
| Pembrokeshire | Region or island | Limewash over rough local stone, plain or tinted with earth pigments | Bright white; reds from the palest pink to deep maroon; yellows as a range of creams | Burnt imported limestone slaked into limewash hid and protected poor rubble walling. Earth pigments supplied the only cheap variation, used in a hierarchy: coloured farmhouse, white outbuildings, bare lesser buildings. | Documented (strong) |
| Suffolk | Region or island | Limewash on lime plaster, including 'Suffolk Pink' | Pastel colours or earth tones; 'some evidence' for Suffolk Pink | Limewash was the principal finish for plaster until the twentieth century, and the pigments historically used in it appear to have given pastels and earth tones. | Documented (limited) |
| Scotland | Country | Lime harling, render and limewash over rubble masonry | A bright, even finish | A sacrificial lime coat shed rain and frost and concealed rubble. Where it has worn away or been stripped, the bare stone now on view is a modern look. | Documented (strong) |
| Stone Town, Zanzibar | District | Coralline ragstone set in lime mortar, plastered and lime-washed | Not stated by the source | UNESCO records the sequence — coralline ragstone, thick lime mortar, plaster, limewash — so the surface seen is the lime, not the stone. | Documented (strong) |
| Old City of Sana'a | District | Rammed earth and burnt brick towers decorated with white gypsum | Ochre buildings against bistre-coloured earth, with white gypsum patterns | UNESCO describes the ochre of the buildings as blending into the earth of the nearby mountains; the white is gypsum applied as geometric decoration. | Documented (strong) |
| Paris | City or town | Zinc sheet roofing | Not stated by the source | A light metal that allowed slimmer roof frames and habitable attics. The record says nearly 80 per cent of Paris roofs are zinc. | Documented (strong) |
| Gwynedd, north-west Wales | Region or island | Welsh roofing slate | Purple, blue, blue-grey, green and red, changing only slightly and slowly in use | A Cambrian slate quarried in several vein colours. The register notes only slight and slow change in use, so roofs keep the colour of the vein they came from. | Documented (strong) |
| St George's, Bermuda | City or town | White-washed limestone walls and roofs | White | Soft local limestone needs a lime coat, and with fresh water scarce the white pitched roofs are built to collect rain into cisterns. | Documented (strong) |
Why: A modern masonry paint was applied over limewashed plaster; where the film breaks, moisture is trapped between plaster and paint.
Fix: Keep to limewash, or a breathable mineral paint where the authority accepts it, on walls that have always been limewashed.
Why: Render or harling was hacked off to expose rubble that was built to be covered.
Fix: Look for traces of the old coating under eaves and in window reveals before deciding what the wall was meant to show.
Why: Traditional lead paints gave an off-white; modern brilliant white is colder and brighter than anything the building had.
Fix: Use an off-white or broken white for historic woodwork, as the Pembrokeshire guidance advises.
Each statement is labelled by kind — established fact, a standard’s requirement, observed market data, a convention, or Colourwise’s own interpretation or analysis — with the strength of the evidence behind it.
FactStrong evidence· Scotland
Historic external lime coatings in Scotland — harling, render and limewash — protected masonry from rain, wind and frost and gave elevations a bright, even finish; limewash is sacrificial, and stripping harling has established a modern aesthetic of exposed rubble that differs from the buildings' historic appearance.
Caveat: Taken from the technical paper's abstract; its case studies were not read.
Source: Technical Paper 31: Historic External Lime Finishes in Scotland
ConventionStrong evidence· Pembrokeshire, Wales· Guidance dated August 2009
In Pembrokeshire, white limewash was varied with earth pigments into reds and yellows, traditionally used in a hierarchy with the farmhouse coloured, the principal outbuildings white and lesser buildings left as stone.
Source: Traditional Pembrokeshire Buildings: Exterior Colour Schemes
FactStrong evidence· Suffolk, England· Guidance, 3rd edition, October 2025
Limewash was the principal finish for plaster in Suffolk up to the twentieth century, and the local planning authorities state that evidence for historic building colours in the county is limited, with some evidence for 'Suffolk Pink'.
Source: Conservation Advice: Limewash and Paints (3rd edition)
FactStrong evidence· St George's, Bermuda
In St George's, Bermuda, walls and roofs are white-washed because of the soft limestone used for construction, and the white roofs and their pitch are designed to collect rainwater into cisterns.
FactStrong evidence· Willemstad, Curaçao
UNESCO dates Willemstad's coloured exteriors to 1817, when white lime finish on building exteriors was prohibited, apparently to protect eyesight from glare; the predominant colours are red, blue, yellow ochre and shades of green.
Caveat: The prohibition and date are stated outright; the eyesight explanation is qualified by UNESCO itself.
Reviewed 6 October 2026. Colourwise summarises its sources in its own words and does not reproduce standards text or proprietary colour data. Spotted an error? Tell us.