External Venetian Blinds

01

The physics, in plain terms

An interior blind manages heat that has already entered the room through the glass. An external venetian intercepts most of that heat before it ever reaches the pane — on a large west-facing elevation, the difference in how a room actually feels by four in the afternoon is dramatic. It's the same logic European and high-end South African architects use to shade glass buildings, applied to a Bellville home.

02

Built for Bellville's four-o'clock hour

From mid-afternoon, Bellville's summer sun sits low and fires almost horizontally under any eave — the geometry that makes west-facing glass the hard case across every suburb here, whether it's a Loevenstein view home or a De Tijger facade above the tree canopy. Wide aluminium slats (in the 60–90mm class), guided in side rails or cables, tilt and raise to answer that angle directly rather than just softening it from indoors.

03

Effectively always motorised

An exterior blind needs to protect itself, so external venetians are specified with motorisation and a wind-sensor auto-retract as standard — the system lowers itself before the day's heat builds and lifts clear before a Cape Doctor gust arrives. Powder-coated finishes are engineered for genuine weather exposure, not just a showroom sample.

• 60–90mm aluminium slats in guided side rails or cables
• Motorised as standard, with wind-sensor auto-retract
• Powder-coated finishes engineered for genuine weather exposure

04

What an external venetian costs

Working outside the glass is a different order of cost, because the blind becomes an outdoor structure with its own guide rails and a wind rating to meet. As a guide per square metre installed, budget R3,000 to R4,500 for a crank-operated external venetian and R4,500 to R6,500 once it is motorised — and on this product motorised is what almost every Bellville facade ends up choosing.

Small openings still carry a minimum charge, since the rails, brackets and setting out are the same work on a narrow window as a wide one. Nothing is firm until the facade has been seen: exposure, the wall build-up and the fixing detail all move the figure, so the written quote comes after the free measure.