Ramp Gradient Standards Compared: 14 Countries, No Two Alike
Sam Petherbridge · Qualified Carpenter & Builder
If you’ve ever tried to find “the” ramp gradient rule for your country, you’ve probably discovered there isn’t one — there are several, and which one applies depends on whether you’re building an egress ramp, an accessible path, or just a step-free entry to an ordinary house. Ramp gradient is, by some distance, the most fragmented category we compared. France and India both explicitly exempt an ordinary private house from any mandatory ramp gradient whatsoever. Germany and Sweden fix a number only for the accessible-ramp case. And sitting apart from all of it is Japan, where a flat 1/8 gradient binds every building — including a plain house — with no accessibility carve-out at all.
Maximum ramp gradient, by country
| Country | Max gradient (general/private house) | Governing standard / clause |
|---|---|---|
| Australia | 1:14 (Class 1a house access path, crossfall max 1:40); optional step ramp 1:10 | NCC 2025 Livable Housing Design, Part 1 (D4D12 is Class 2–9 only) |
| USA | 1:12 (egress-door ramp) / 1:8 (all other residential ramps) | IRC 2021 R311.8.1 |
| New Zealand | No private/residential-specific figure exists. D1/AS1’s table only covers accessible (1:12), common (1:8–1:10) and service (1:3) ramps — none is a “private house” category | NZBC D1/AS1 Table 3 |
| UK (England) | 1:12 max (M4(1) mandatory dwelling-approach baseline) | Approved Document M Vol 1, para 1.7a |
| Canada | 1:10 (residential occupancy, interior & exterior) | NBC 2020 9.8.5.4 |
| Ireland | 1:20 general (TGD K); dwelling approach route banded 1:20–1:12 by run length (TGD M) | TGD Part K 2014 / TGD Part M 2022 |
| France | No general ramp rule at all — an ordinary self-built house is legally exempt from the entire accessibility regime that sets the only codified ramp figures | CCH art. L111-7-1 (owner-build exemption) |
| Germany | 6% / 1:16.7 — but only for an accessible ramp. An ordinary private-house ramp has no separate fixed maximum under most Länder | DIN 18040-2:2011-09 — paywalled, no free primary URL |
| Spain | 12% (general ramp — the normal case for a house) | CTE DB-SUA 1 §4.3.1.1 |
| Indonesia | 6° (≈1:10) indoor / 5° (≈1:12) outdoor | Permen PUPR 14/2017, Lampiran II §2 |
| India | No ramp required at all for an ordinary house. The only detailed table (1:12–1:20, banded by rise) is an accessibility annex whose own scope clause excludes private residences | NBC 2016 Part 3, Annex B, Table 10 — bis.gov.in |
| Japan | 1/8 / 12.5% — binds every building, including an ordinary house, with no accessibility carve-out | Building Standard Law Enforcement Order, Art. 26 |
| Norway | 1:15 general; 1:12 permitted where the run is under 3.0 m | TEK17 §12-16 |
| Sweden | No fixed gradient for a general ramp. 1:12 is fixed only for the accessible-ramp case (unchanged since the old BBR) | BFS 2024:12, Kap 2 §4 |
Japan’s 1/8 rule doesn’t bend for anyone
Every other country on this list carves ramp gradient up by use case — general vs. accessible, private vs. commercial, egress vs. everyday. Japan doesn’t. Article 26 of the Enforcement Order sets a flat 1/8 (12.5%) maximum that applies to a ramp in any building, full stop. It’s also, numerically, one of the steeper maximums on the list — steeper than the UK’s 1:12, Australia’s 1:14, and Ireland’s 1:20 general figure — which makes it an unusual combination: strict in the sense of “applies to everyone, no exceptions,” but permissive in the sense of “allows a genuinely steep slope” compared to accessibility-driven figures elsewhere.
France and India let an ordinary house skip the rule entirely
The more common story on this table isn’t a strict universal number — it’s no number at all for a typical private house. France’s Code de la construction et de l’habitation exempts an owner-built house from the entire accessibility regime that contains the only codified French ramp figures (art. L111-7-1), so there’s genuinely no general ramp rule to comply with. India’s position is structurally similar: NBC 2016’s only detailed ramp table lives inside an accessibility annex whose own scope clause explicitly excludes private residences. If you’re building an ordinary detached house in either country, “what gradient does the code require?” can have a legitimate answer of “none, for this building.”
Accessible-ramp figures and general-ramp figures are not the same number
Germany and Sweden both illustrate a trap worth knowing about: their headline ramp figures (Germany’s 6%/1:16.7, Sweden’s 1:12) apply specifically to an accessible ramp under a dedicated accessibility standard, not to an ordinary private-house ramp as a category. In both countries, a standard domestic ramp has no separate fixed maximum of its own under most jurisdictions. If you find a ramp gradient figure while researching your local code, check what class of ramp it’s actually describing before you build to it — an accessible-ramp number and a general-ramp number can sit a long way apart.
Check your own country’s full ramp rules
The table above is the headline figures. Each country’s building-code hub page covers landing lengths, crossfall, handrail requirements and the full clause text:
- Australia — ramp gradients
- USA — ramp gradients
- New Zealand — ramp gradients
- UK (England) — ramp gradients
- Canada — ramp gradients
- Ireland — ramp gradients
- France — ramp gradients
- Germany — ramp gradients
- Spain — ramp gradients
- Indonesia — ramp gradients and landings
- India — ramp gradients
- Japan — ramp gradients
- Norway — ramp gradients
- Sweden — ramp gradients
Set out your ramp gradient without the guesswork
Whether you’re working to a strict 1/8 maximum or a general figure with no accessibility carve-out, a ramp lives or dies on getting the rise-over-run gradient right before you cut a single stringer or joist. Chippy Tools’ roof pitch & rafter calculator handles rise, run and gradient conversions in seconds — in a ratio, a percentage, or degrees — so you can check your ramp against whichever figure your local code actually requires.
Skip the manual maths
Chippy Tools has professional calculators that handle these calculations for you — offline, on any device.
Frequently asked questions
- Which country has the strictest ramp gradient rule?
- Japan. Article 26 of the Building Standard Law Enforcement Order fixes a maximum gradient of 1/8 (12.5%) that applies to every building, including an ordinary house — with no size, use, or accessibility carve-out. That makes it the only genuinely universal ramp rule on the list; every other country either bands the figure by use case or exempts private houses from it altogether.
- Do all countries require a ramp gradient on a private house?
- No. France exempts an ordinary self-built house from its entire accessibility regime — the only codified French ramp figures sit inside rules a private build doesn't have to meet. India is similar: its only detailed ramp table (1:12–1:20, banded by rise) is in an accessibility annex whose own scope clause excludes private residences.
- What's the most common maximum gradient figure?
- 1:12 (roughly 8.3%) shows up repeatedly — as the US egress-door ramp maximum, the UK's mandatory dwelling-approach baseline, and the ceiling for accessible ramps in Germany and Sweden. But it's rarely the *only* figure in play; most codes band the maximum by run length, use, or whether accessibility standards apply.
- Why is this the most fragmented category out of stairs, ramps, guards and footings?
- Because 'ramp' covers several very different things depending on the code — an egress ramp, an accessible-path ramp, a general service ramp, and a private-house entry ramp can all carry different figures within the same country, and several countries (France, India) exempt an ordinary house from the rule entirely. There's no single universal figure the way there is for, say, guard height.