[Home](https://garde-corps-fer-forge.fr/en/) / [Articles](https://garde-corps-fer-forge.fr/en/articles/) / The regulatory height of a balcony or terrace guardrail Standard # The regulatory height of a balcony or terrace guardrail 1m, 0.80m, which rule applies? The detail of the threshold that triggers the requirement, and the one exception that allows a lower minimum height. 14 October 2026 · 2 min read ## The base rule: 1 metre For a balcony, terrace, gallery or loggia, the minimum guardrail height is 1m, measured from the finished floor. That's the reference to use in the vast majority of cases — a height designed to prevent tipping over the structure, not just to visually discourage. ## The 0.80m exception: a precise case, not a general option A tolerance exists: the height can drop to 0.80m, but only if the guardrail itself is a massive element over 50cm thick — for example a low wall incorporating a planter. This exception follows a simple logic: an element that thick mechanically reduces the tipping risk even at a lower height. For a classic wrought-iron guardrail (balusters, slender posts), this exception practically never applies — 1m remains the reference to use. ## When does the requirement kick in? A guardrail becomes mandatory once the fall height exceeds 1m, or the ground slope exceeds 45°. A level terrace, with no significant drop relative to the surrounding ground, generally isn't affected — but an upper-floor balcony, even a modest one, almost always is once it overlooks a drop of more than a metre. ## Spacing: the same logic as a staircase Once the height is set, infill spacing follows the same rules as a staircase: 11cm maximum for vertical balusters over the full height, and for a horizontal rail, under 11cm in the anti-climb zone (the first 45cm), up to 18cm above that. See our [standards and safety](https://garde-corps-fer-forge.fr/en/standards-and-safety/) page for the full detail. ## Why outdoor exposure changes things beyond height Beyond sizing, a balcony or terrace guardrail faces a constraint an indoor stair guardrail doesn't: direct weather exposure. That's why an outdoor structure is systematically hot-dip galvanized before powder coating — see our dedicated article on [galvanizing and powder coating](https://garde-corps-fer-forge.fr/en/articles/galvanizing-or-powder-coating/) . Frequently asked questions My terrace is only raised 60cm, do I need a guardrail? The trigger threshold is a fall height over 1m. At 60cm, the regulatory requirement generally doesn't apply, but a guardrail is still worth considering for safety depending on the setting (children present, for example). Can I go down to 0.80m for aesthetic reasons? No, unless the guardrail itself is a massive element over 50cm thick — a precise technical exception, not a free aesthetic choice. Does the height change if the balcony is in a co-owned building? Height and spacing rules stay the same; in a co-owned building, extra administrative steps (approval from the managing agent or general meeting) may apply depending on the building's bylaws. Read next ## More articles [01 Guardrail or balustrade, which is the right word? The brief behind this site notes it explicitly: buyers almost always mix up these two terms. Here's what actually separates them. Read →](https://garde-corps-fer-forge.fr/en/articles/guardrail-or-balustrade-whats-the-difference/) [02 What the NF P01-012 standard actually requires for a staircase Height from the stair nosing, baluster spacing, the anti-climb zone: the detail of what the NF P01-012 standard actually requires for a stair guardrail. Read →](https://garde-corps-fer-forge.fr/en/articles/stair-guardrail-nf-p01-012-standard/) [03 Low sill: the 0.90m rule explained Why some windows need no protection at all and others do — the detail of the French building regulation on low window sills. Read →](https://garde-corps-fer-forge.fr/en/articles/window-guardrail-low-sill-rule/) Have a project in mind? ## Describe it, get a quote within 48h [Get my quote](https://garde-corps-fer-forge.fr/en/quote/)