Awaiting expert review. This page covers safety or regulatory rules that change over time. It is kept out of search results until a qualified reviewer has checked it; the sources below are dated so you can verify each point.
Quick answer
Landscape steps and garden stairs are a short run of level treads and risers that carry people over a grade change in a yard, made from stone, concrete, pavers, timber or other materials.
They are simple to describe and easy to get wrong. The same slope needs a different number of steps under different codes, and uneven steps are a trip hazard. Code limits for stairs vary by building code, edition and city, and apply only if your building department says they cover your steps.
Quick facts
The key facts about Landscape Steps and Garden Stairs, with sources:
- Riser
- The vertical height of one step 1
- Tread
- The horizontal depth of the surface you step on 2
- Model residential riser limit
- 7 3/4 in. maximum in the model residential code text; masonry stairs up to 8 in. 1
- Other limits in force
- Baltimore City: 8 1/4 in. riser, 9 in. tread; 2021 IBC as read: 7 in. and 11 in. 23
- Federal accessibility standard
- Risers 4 to 7 in., treads 11 in. minimum, but only for stairs on required egress routes 4
- Main hazard
- Uneven or slippery steps cause trips and falls 5
Key takeaways
- A riser is the vertical height of one step and a tread is the horizontal depth. Codes cap the first and set a floor for the second.
- The limits are not the same everywhere. The model residential text we read caps risers at 7 3/4 inches, Baltimore City allows 8 1/4, and a commercial code read for Illinois caps them at 7.
- Uniformity matters more than the exact number. The three building codes we read limit the difference between the biggest and smallest riser in a flight to 3/8 inch.
- Split the total rise into equal steps first, then check the result against your local limit.
- Steps that hold back soil, attach to a house or deck, or sit on a steep slope can be structural. Ask the building department and an engineer.
What landscape steps are, in plain terms
Landscape steps are a short series of steps outside the house that lets people walk up or down a slope. A step has two parts. The riser is the vertical rise from one tread to the next.
The tread is the horizontal surface you stand on. Baltimore City's code, for example, measures riser height between the leading edges of adjacent treads and tread depth horizontally between their foremost projections 2.
They differ from a path. A path follows the ground. Steps add a built grade change, so a poorly spaced step becomes a trip point. NIOSH's stairway checklist says any change in step dimension along a stairway makes users pay special attention and can lead to trips and falls 5.
They also differ from a retaining wall. Steps carry people. A wall holds soil. Where steps are cut through a slope, a wall often sits beside them. See segmental retaining walls for that side, and the patios and walkways page for the service.
How the geometry works, and how to split a slope into steps
The method is arithmetic. Measure the total rise, which is the height from the lower ground to the upper ground. Pick a riser height at or under your local limit.
Divide the total rise by that height and round up to a whole number of risers. Then divide the total rise by the number of risers so every riser is identical.
That last step is the one that matters, because codes limit how much risers can differ within a flight, not just how tall they are 12.
Then check the tread. Codes set a minimum depth, and the run available on the slope decides whether the layout fits. If the run is too short, you need a gentler slope, a landing, or a switchback.
A step also has a finished thickness, so rise should be measured to the finished surface, not the rough ground. That is our reading of how the arithmetic works; the codes we read state the limits, not the layout method.
When the top of the top step meets level ground, the number of treads is one fewer than the number of risers. That is geometry, not a code rule.
- Measure total riseLower finished ground to upper finished ground
- Pick a riser at or under the limitUse the local code number, not a rule of thumb
- Divide and round upThe result is the number of risers
- Divide againTotal rise divided by risers gives one equal height
- Check the tread and runDoes the available run fit the tread depth the code requires?
Layout arithmetic, not a code quotation. Your local limit and the building department decide what is allowed.
Same step, three codes: what each one prints
| Code read | Maximum riser | Minimum tread | Uniformity in a flight |
|---|---|---|---|
| Model residential text (IRC R311.7.5.1, as South Carolina reprints it) | 7 3/4 in.; masonry stairs up to 8 in. 1 | Not read for this text | Largest riser no more than 3/8 in. above smallest 1 |
| Baltimore City Code, 2024 edition, IRC Part X amended | 8 1/4 in. 2 | 9 in. 2 | Riser and tread each within 3/8 in. 2 |
| Illinois Building Code 2021 (IBC 2021) section 1011.5, commercial and public buildings | 7 in. maximum, 4 in. minimum 3 | 11 in. 3 | No more than 3/8 in. in any flight 3 |
| ABA Standards (federal accessibility), egress stairs only | 4 to 7 in. 4 | 11 in. 4 | Uniform risers and treads across the flight 4 |
A standard, a law and a design habit are different things
The IRC and IBC are model codes that a state or city adopts, often with changes, as Baltimore's 8 1/4 inch riser shows.
The ABA Standards are federal rules for facilities covered by the Architectural Barriers Act. A habit like "keep risers shorter outside" is not in any of them. Ask which edition your building department has adopted.
Example: the same 30-inch slope under two limits
The 30-inch rise is invented. The limits are the maximum risers printed in the codes above 123. The arithmetic is ours.
| Limit used | Maximum riser | Risers needed | Equal riser height |
|---|---|---|---|
| Baltimore City (amended IRC) | 8 1/4 in. | 30 ÷ 8.25 = 3.6, round up to 4 | 30 ÷ 4 = 7.5 in. |
| IRC R311.7.5.1 text | 7 3/4 in. | 30 ÷ 7.75 = 3.9, round up to 4 | 30 ÷ 4 = 7.5 in. |
| IBC 2021 as read for Illinois | 7 in. | 30 ÷ 7 = 4.3, round up to 5 | 30 ÷ 5 = 6 in. |
The same slope needs four risers under one limit and five under another. If the available run is short, the extra riser needs more horizontal room. Use the gravel calculator to estimate fill for the tread surfaces once the layout is set, and ask your building department which limit applies.
Where you meet the term: designs, bids and permits
On a landscape design. A plan should show the total rise, the number of risers, the riser height and the tread depth. If it only says "stone steps," ask for those numbers. See landscape design for how plans are produced.
On a bid. A line like "install garden steps" should say the material, the count and who handles any base and edging. The landscaping estimates guide shows how to compare lines.
On a permit form. Steps usually come up when they connect to a house, deck or porch, or sit in a wall. Our permit thresholds research covers the nearby wall question.
Next to drainage. Steps on a slope change where water flows. See landscape grading and hardscape drainage.
What steps offer, and what they ask for
What well-made steps give you
- Make a slope walkable. A set of equal steps lets people move without stepping over uneven ground.
- Uniform steps reduce trips; NIOSH ties uneven dimensions to trips and falls 5.
- Handrails, visible nosings and slip-resistant surfaces are all listed in NIOSH's checklist as ways to reduce slips 5.
- Can be part of a stepped grade that slows runoff down a slope. See swale vs. berm for water-shaping options.
Limits and burdens
- Need an even layout. Small errors in a riser show up as trips 51.
- Limits differ by code and place, so one design may not travel 23.
- Steps that are wet, icy or leaf-covered are slippery, and NIOSH lists slip-resistant treatment of treads, nosing and landings 5.
- Steps built on soft or shifting ground can move; see our expansive soils research.
Limits of the evidence
We read code text on four pages, not the ICC library, which returned HTTP 403.
The residential riser figure comes from South Carolina's reprint of IRC R311.7.5.1, which does not name the IRC edition and lists later state amendments without describing them 1.
We did not read a page that printed the residential tread minimum in the model text. Baltimore's 9-inch tread is the city's own number 2.
The Illinois IBC 2021 page applies to commercial and public buildings, so its limits are context, not a rule for a home yard 3.
The ABA Standards apply only to stairs on a required means of egress, and not to stairs that are not part of one 4.
The NIOSH checklist is written for mine stairways and workers 5.
None of the pages we read said whether a free-standing garden step falls under the residential stair section. Baltimore's page does not address exterior stairs either way 2.
We found no university Extension guide with sourced garden-step proportions. Garden magazines and DIY sites publish rules of thumb, which we did not use. Ask your building department what applies.
What drives the price, and how long steps last
We do not publish prices. The drivers are the number of steps and their width, the material, the base preparation, excavation and haul, any wall or edging beside them, drainage and lighting. A steep slope needs more steps, and more steps need more run. See the cost hub for what shapes a bid.
On lifespan, a source-based answer is "it depends." The sources we read do not give one for garden steps. Material, base, drainage, freeze and thaw, and use all matter. We give no number of years.
Maintenance costs are small if steps drain and are kept clear. Costs rise when a step settles or tilts, because that changes a riser and breaks the uniformity rule.
How a steps job runs
A careful homeowner can plan and build very low steps. Taller flights, steps beside walls, and steps on slopes are contractor work. No structural design is given here.
- Ask the building department. Ask whether your steps fall under a stair section, whether a permit applies and which riser and tread limits are in force.
- Call 811. Have underground utilities marked before any digging for the base or footings.
- Survey the slope. Measure total rise and available run to the finished surface.
- Lay out equal risers. Divide the rise as in the example and mark every step.
- Plan drainage. Decide where water goes off the steps and the slope so it does not run onto a neighbor or into a sanitary sewer.
- Build and check. Check every riser and tread before the surface is finished, since NIOSH ties non-uniform dimensions to trips 5.
- Add handrails, lighting and slip resistance where the code or the use calls for them. NIOSH lists handrail height of 34 to 38 inches in its workplace checklist 5, and ABA lists the same range for covered egress stairs 4. Your local rules decide the home case.
Wall, slope and height checks
Call 811 before digging. Steps that hold back soil are retaining walls and may need an engineer and a permit.
Steps attached to a house, deck or porch, or built on a steep slope, need the building department and often an engineer. This page gives no structural design.
Wet, icy or leaf-covered steps are slippery, so keep them clear and treat the surface for grip.
Keeping steps safe
Upkeep tasks are listed here without fixed dates. The timing depends on climate, tree cover and use.
- Keep treads clear of leaves, mud and ice. NIOSH's checklist lists slip, trip and fall hazards from upkeep and housekeeping 5.
- Check slip resistance of the tread, nosing and landing surfaces. NIOSH lists treatment to reduce slipping 5.
- Check each riser after a freeze or heavy rain. A settled step changes riser height.
- Keep water off the steps. Check gutters, downspouts and the slope above. See downspout drainage.
- Keep lights working where steps are used after dark.
Warning signs, and when to call a pro
- A step that is taller or shorter than the others. Uneven steps are a trip hazard 5. Fix or rebuild.
- Tilting or rocking treads. The base has settled or washed out.
- Cracks or bulges in a wall beside the steps. See soil compaction, and call an engineer for walls.
- Water running down the steps. Redirect it; see surface vs. subsurface drainage.
- Steps that pull away from a house or deck. This is structural. Call a contractor or engineer.
Rules and standards that apply
Building code (law, as adopted locally). The International Residential Code is a model code. South Carolina reprints R311.7.5.1 with a 7 3/4 inch riser limit and a 3/8 inch uniformity limit 1.
Baltimore City adopts the IRC with changes and prints 8 1/4 inch risers and 9 inch treads in its 2024 edition 2. Edition, adoption and amendments vary by state and city.
Commercial building code. The 2021 International Building Code section 1011.5, as the Illinois Building Code prints it, sets 7 inch risers and 11 inch treads for buildings it covers 3.
Federal accessibility standard. The ABA Standards, section 504, set 4 to 7 inch risers and 11 inch treads, but apply only to stairs on a required egress route, not to stairs that are not part of one 4.
Workplace guidance (voluntary). NIOSH's checklist is a hazard-spotting tool for mine stairways, not a residential rule 5.
Other rules. Zoning, HOA covenants, setbacks and drainage rules are separate from stair rules.
Steps compared with the terms near them
| Term | What it is | Key difference | Where to read more |
|---|---|---|---|
| Landscape steps | Treads and risers across a yard grade change | Built level steps for people | This page |
| Path | A surface that follows the ground | No built rise | See gravel path vs. paver path |
| Retaining wall | A structure holding back soil | Holds soil, not people | See the wall link in the first section |
| Paver patio | A flat paved area | Level; may have one or two steps at edges | See interlocking concrete pavers |
| Landscape edging | A border between surfaces | Contains material beside the steps | See landscape edging |
Common landscape step myths
- Myth Garden steps have one national size rule.
- Reality The limits we read run from 7 inches to 8 1/4 inches for risers, depending on the code 123.
- Myth A small difference between steps does not matter.
- Reality Codes cap the difference at 3/8 inch in a flight, and NIOSH says changes in dimension can lead to trips and falls 15.
- Myth Outdoor steps are exempt from code.
- Reality We could not confirm either way from the pages we read. Ask your building department.
- Myth If it is for accessibility, it applies to my yard.
- Reality The ABA Standards apply to stairs on required egress routes of covered facilities, not to residential garden steps 4.
- Myth Steps are not structural.
- Reality Steps beside or through a wall, or attached to a house, can be structural. Ask a pro.
The local variable: adopted code and ground that moves
Two local things matter. The adopted code decides the riser and tread limits: the 7 3/4 inch, 8 1/4 inch and 7 inch figures above come from three different jurisdictions and editions 123.
And the ground decides whether steps stay level. Expansive clay and frost can move a base, and the research page on expansive soils covers where that applies. Frost depth is set locally, so ask your building department.
When steps are the right answer, and your next step
Steps fit a grade change that is too steep for a sloped path. If the rise is small, a gentler slope may do. If the grade change is large, steps are often paired with a wall, which brings in the engineering and permit questions above.
Your next step is to measure the total rise, ask the building department which limits apply to exterior steps at your address, and ask each bid for riser count, riser height and tread depth.
To find help, read choosing a landscaping company, and ask a bidder how they keep every riser equal.
Questions about Landscape Steps and Garden Stairs
What is the difference between a riser and a tread?
A riser is the vertical height from one step to the next. A tread is the horizontal surface you step on. Baltimore City's code measures riser height between the leading edges of adjacent treads and tread depth horizontally between the foremost projections of adjacent treads.
How high should garden steps be?
It depends on the code that applies. The model residential text we read allows risers up to 7 3/4 inches, Baltimore City allows 8 1/4, and the 2021 IBC as read for Illinois allows 7. Your building department can tell you which limit covers exterior steps at your address.
How deep should the tread of a garden step be?
Codes we read set minimums of 9 inches in Baltimore City and 11 inches in the 2021 IBC as read for Illinois and in the ABA Standards. We did not read the model residential tread text. Local code decides, and uneven depths are a trip hazard.
Do garden steps need to be the same height?
Yes, within a small tolerance. South Carolina's reprint of IRC R311.7.5.1, Baltimore City and the 2021 IBC as read for Illinois all limit the difference between the greatest and smallest riser in a flight to 3/8 inch. NIOSH says changes in dimension along a stairway can lead to trips and falls.
How do you work out how many steps you need?
Measure the total rise, divide it by a riser height at or under your limit, and round up. Then divide the total rise by that number so every riser is equal. A 30-inch rise needs four 7.5-inch risers under an 8 1/4 or 7 3/4 inch limit, and five 6-inch risers under a 7-inch limit.
Do I need a permit to build garden steps?
It depends. Steps attached to a house, deck or porch, steps in or beside a retaining wall, and steps on a steep slope are more likely to need review. We could not confirm from the code pages we read whether free-standing garden steps are covered, so ask your building department before you start.
Do garden steps need a handrail?
It depends on local code and on whether the steps are part of a required egress route. The ABA Standards require handrails on both sides of covered egress stairs, set 34 to 38 inches above the nosing. NIOSH lists the same height range in its workplace checklist. Check what your building department requires.
How do you make garden steps less slippery?
Keep them clear of leaves, mud and ice and treat the surface for grip. NIOSH's stairway checklist lists slip-resistant treatment of treads, nosings and landings, and visible nosing edges, as ways to reduce slips and falls. Good drainage also keeps water off the steps.
Are the ABA accessibility rules the rule for my yard?
No. The ABA Standards apply to covered facilities, and to stairs that are part of a required means of egress, not to stairs that are not. They set risers at 4 to 7 inches and treads at 11 inches minimum for those stairs. A home yard follows its local building rules.
Sources
- South Carolina Code of Regulations § 8-1210, IRC R311.7.5.1 Risers (via Cornell Legal Information Institute; edition not named on the page), retrieved .
- Baltimore City Code, Building, Fire, and Related Codes (2024 edition), Part X International Residential Code, Chapter 3, Section 311 Means of Egress, retrieved .
- Illinois Building Code 2021 (2021 IBC as adopted), Section 1011.5 Stair treads and risers, via UpCodes, retrieved .
- U.S. Access Board, Technical Guide: Stairways (ABA Standards, Chapter 5, section 504; PDF text extracted with pdftotext), retrieved .
- CDC NIOSH, Stairway Checklist (ErgoMine 2.0; PDF text extracted with pdftotext), retrieved .
Expert review
Written by the HyreYard Research Desk. Not yet reviewed by an outside expert. We say so rather than imply a review that has not happened; see our editorial policy.
How the numbers were checked: Held G-REV. Riser and tread limits are quoted only where a loaded code page printed them, with the code and edition named in each row.
The model IRC tread text was not read, the ICC library returned 403, and no source confirmed whether free-standing garden steps fall under a stair section. The 30-inch rise example is invented, and the arithmetic is ours. A licensed landscape architect or engineer must review before release.
Suggest a correction. We fix errors and say what changed.