External Venetian Blinds

The physics, in plain terms

An indoor blind manages heat that's already inside the room; a blind mounted outside the glass stops most of it before it arrives. On a west-facing tasting room or double-volume living wall, the difference in indoor temperature is dramatic — it's how European and high-end South African architects have shaded glass buildings for decades, and it works exactly the same way in a Franschhoek valley summer.

Where a facade change is actually on the table

This is deliberately not the product we lead with on a protected village gable — anything visible from Huguenot Road or Main Road on a building over 60 years old needs Heritage Western Cape sign-off under Section 34 before it needs a tape measure, and an inside-mount timber venetian usually answers that brief faster. External venetians earn their keep on the newer wine-estate additions and architect-designed builds where a facade change is genuinely part of the plan from the outset — a west-facing tasting room, a double-volume entertaining wall, or a new-build guest wing behind an older street frontage.

Product reality

• Wide aluminium slats (60–90mm class) running in guided side rails or cables, tilting and raising like an indoor venetian scaled up
• Effectively always motorised, with a wind sensor that auto-retracts before the valley's evening drainage wind or a storm gust reaches it
• Powder-coated finishes engineered for weather exposure, including a wet Winelands winter
• Best planned at design stage on a new build; retrofit is possible on a suitable elevation with the right facade fixing points

Honest limitations

This is premium spend and a visible change to the facade — the opposite of the low-friction, inside-the-sash answer that suits most of the historic village core. On any estate or heritage-adjacent property, we'll flag upfront whether it's actually the right conversation to have, rather than push a facade product where an inside-mount blind would get approved faster and cost less.

Fitting external venetians across the valley

The newer wine-estate wings around Franschhoek and further out toward Paarl's golf and wine estates are where this product does its best work; on the older farmstead stock in Groot Drakenstein and Simondium, or the heritage core of Stellenbosch, we'll usually talk you through an inside-mount option first.

What external venetians cost

These are the premium end of the range and the pricing says so: hand-wound, R3,000 – R4,500 per square metre once fitted, and R4,500 to R6,500 per square metre motorised. The reason is not the slat but everything around it — guide rails down both sides, a head box, fixings engineered to hold in wind, and a finish built to survive full Winelands sun for years rather than seasons.

On a motorised system a wind sensor is not an optional extra in our view, and it is quoted as its own line so you can see what it costs. There is a minimum charge on a small opening, and there is a threshold question before any of it: the wall above the window has to be sound, there has to be room for the rails, and the facade has to permit an exterior fixing. That is settled at the free measure, and if the answer is no, an interior specification goes into the quote instead.