Movable shading for low-angle morning/evening sun that fixed overhangs can't block.
Cost
Medium
Upkeep
Frequent
Skill to build
Basic
Lifespan
20-30 years for the moving hardware (hinges, tracks, motors if motorised); the shading material itself may need earlier renewal
Embodied carbon
Low
Space / material use
Low
Output timing
On-demand/controllable
Skill to repair
Basic
Regulation (FR example)
Changing the external appearance of an existing building normally requires a prior declaration (declaration prealable) at the mairie; stricter rules and an architect consultation apply within a protected or heritage perimeter.
Note: Cost, carbon and footprint are rated against the other options for this same need, not in absolute terms.
Inputs
none
Outputs
none
Sources
General exterior shading-hardware industry durability consensus
No sizing or quantities: how much a technique yields, and how much a household needs, both depend on the build and the people, so the catalogue compares options rather than dimensioning them. It carries no bill of materials and no build sequence, and it is written for an oceanic, clay-soil climate (Normandy, France). Regulatory notes are indicative and need confirming locally.