How to Build Steps With Pavers

Build durable paver steps by planning equal risers, supporting every paver, and controlling water. On soil, excavate unstable material and compact a suitable aggregate base; on concrete, use a compatible exterior-rated bonding system. Check local stair rules before work, since code requirements can differ for landscape steps and required exit stairs.

Uneven rises, loose pavers, and water trapped near a foundation are common causes of trouble. The fix starts before the first unit goes down: measure the finished height, choose a stable construction method, and plan where water will drain.

I treat paver steps as a small stairway and retaining system, not as pavers stacked on loose soil. First confirm what rules apply to the project. Then build a firm, drained base and set each tread to the same finished geometry.

Inspect the site, plan stair geometry, and prepare a stable base

A durable stair begins with a measured layout and ground that can support it. Check utilities, soil, drainage, frost exposure, and the finished elevations before digging. Decide whether the steps will sit on compacted aggregate or sound concrete, then account for every paver and bedding layer in the height calculation.

Check local rules and site conditions

The 2021 International Residential Code (IRC) sets a riser height of 4 to 7¾ inches and a minimum tread depth of 10 inches for stairs within its scope. It also limits variation in riser height within a flight to ⅜ inch. These rules may apply to required building stairs, but landscape steps may be treated differently. Confirm the locally adopted code, permit conditions, and whether handrails or guards are required.

Before excavation, locate underground utilities and identify the stair’s top and bottom finished elevations. Check whether runoff has a safe outlet and whether nearby soil is stable. On a sloped site, steps may also need retaining elements that resist soil pressure; pavers alone should not be assumed to provide that support.

Calculate equal risers before choosing the layout

Measure the total rise vertically, from the finished surface at the bottom to the finished surface at the top. Divide that height into equal risers. For example, a 24-inch rise divided into four risers gives a 6-inch rise per step. This is a layout example, not a substitute for checking the rules that apply to your project.

Include the thickness of the tread paver and its setting layer in your elevations. Otherwise, the first or last rise can end up different from the others. Lay out tread depth from finished edge to finished edge, and check that the full flight fits the available space.

Build a base that suits the ground

For soil-supported steps, remove sod, organic matter, and unsuitable or loose soil. Use geotextile where soil conditions call for separation between the soil and aggregate. Place suitable granular base in lifts the compactor can compact effectively. Compact each lift rather than dumping the full depth at once.

Base depth depends on soil, climate, loading, and local frost conditions; there is no single depth that suits every site. If the project specifies a compaction value, follow it. A common specified benchmark is at least 95% of the maximum dry density determined by ASTM D1557, but that requirement is project-dependent, not a universal rule for all paver steps.

Build risers or retaining elements on stable, adequately founded support. Provide drainage behind or around them where needed, and do not rely on loose fill to hold a riser in place. Frost heave or settlement under even one step can rotate the riser and change the rise, so uniform compaction and water management matter throughout the flight.

Set pavers with full support and consistent rise and tread

Setting pavers means giving each unit even, continuous support and checking the finished stair geometry as the work progresses. Dry-lay the units first to confirm cuts, joints, and tread depth. Then use the bedding or bonding method specified for the base and pavers, keeping every riser and walking surface consistent.

Choose the installation method

On soil, install pavers over the specified compacted aggregate and bedding system. Use stable risers or retaining units designed for the job, and restrain exposed edges so the tread cannot spread or shift. Do not place pavers on loose, uncompacted fill or leave unsupported overhangs.

On concrete, first check that the slab is sound, stable, clean, and sloped to drain. Do not cover cracked, moving, contaminated, or moisture-damaged concrete before finding and correcting the cause. Select an exterior-rated mortar or adhesive approved by its manufacturer for the paver, concrete, exposure, and freeze-thaw conditions. Follow its requirements for concrete age, surface preparation, temperature, coverage, and cure time. A generic thinset is not automatically suitable outdoors.

Dry-lay and set the treads

Dry-lay a course of pavers to confirm tread depth, joint alignment, and the fit of edge cuts. Check that each paver has full, even support under the area that will carry foot traffic. Avoid isolated mortar dabs: they leave voids where water can collect and can lead to cracked or loose units.

Work from a consistent reference point and check each finished rise as you go. Use the actual paver thickness and setting material to maintain the planned elevations. Keep tread surfaces level from side to side and pitch them away from the building, typically about ¼ inch per foot, or 2%, where the layout allows. Do not change the slope enough to alter the rise or create an unsafe walking surface.

Paver selection matters too. Use exterior-rated units suitable for stair traffic and the expected exposure. Confirm the manufacturer’s instructions for installation, joints, and sealing. Where slip resistance is safety-critical, request relevant wet-slip test information. A DCOF value of 0.42 is not a universal acceptance standard for outdoor stairs.

Detail drainage, edges, transitions, and stair safety

Good details keep water from collecting on treads, behind risers, or against the building. They also help prevent movement at exposed edges and abrupt changes at the top and bottom of the flight. Plan drainage and finished transitions as part of the stair layout, not as fixes after the pavers are installed.

Direct water away without changing the stair geometry

Pitch each tread outward or away from the building, typically around ¼ inch per foot. Keep the surface even across its width and maintain the planned rise from one tread to the next. Avoid low spots that hold water, especially near a wall or doorway.

Provide a drainage route that does not send runoff into a foundation, onto a neighboring property, or across a walking route. Where risers retain soil, use suitable drainage details for the site and retaining system. Do not block intended drainage with joint material or sealant.

Restrain edges and finish transitions

Use an appropriate edge restraint at exposed sides so pavers stay in place under repeated use. Make clean cuts where units meet walls or other fixed surfaces, and follow the product instructions for any required joints or separation details. Do not wedge pavers tightly against a building if the installation system requires room for movement or drainage.

At the top and bottom, meet the surrounding surface without a sudden, unintended change in level. Check the first and last risers after all adjacent paving, soil, or landing material is finished; those elevations can change during construction. Confirm locally whether a handrail or guard is required for the stair’s location and use.

Example: diagnosing a settling step

Consider a short garden stair where one tread drops after winter while the others remain level. A likely place to investigate is the support below that step: water may have softened the soil, or the base may not have been compacted evenly. This example illustrates a failure pattern, not a diagnosis for every site.

Before resetting the paver, check the riser, base, and drainage path. Simply adding bedding material on top may hide the movement without correcting it. Restore stable support, correct the water path, and recheck all riser heights before reopening the steps to use.

Maintain joints, manage water, and protect pavers long term

Maintenance helps reveal movement before it becomes a trip hazard. Keep joints filled with the specified material, clear debris from drainage paths, and inspect the stair after freeze-thaw periods or heavy rain. Protect new work from traffic and weather for the time required by the installation materials.

Finish joints and protect new work

Fill joints with the material specified for the pavers and installation method. Do not substitute joint sand, mortar, or polymeric joint material without confirming compatibility. If the manufacturer recommends a sealer, use one approved for that paver and exposure; sealing is not required for every product.

Keep people and equipment off the finished work for the specified cure period. Temperature, moisture, and product choice affect curing, so follow the manufacturer’s instructions rather than relying on a fixed waiting time. Before use, check for rocking units, open joints, pooling water, and inconsistent rises.

Inspect after weather and through the seasons

Look for loose pavers, washed-out joints, cracks, and new low spots. If a step shifts, find the cause before resetting it. Settlement beneath a single riser can create a different rise from the rest of the flight, even when the pavers themselves remain intact.

Clear leaves and sediment that block drainage. In freezing climates, monitor areas where water may collect or enter joints. Repairing the source of movement or water is more reliable than repeatedly topping up a visible gap.

Frequently asked questions

These answers cover common decisions when planning and building paver steps. Local rules, site conditions, and manufacturer instructions can change the right detail, so use them alongside the project’s permit documents and product specifications.

Can I build paver steps directly on soil?
Not safely on loose or uncompacted soil. Remove unsuitable material and build a drained, compacted aggregate base with stable risers and edge restraint.

How tall should each paver step be?
For stairs governed by the 2021 IRC, risers must be 4 to 7¾ inches high, with no more than ⅜ inch variation within a flight. Confirm local adoption and whether landscape steps fall under the same rules.

How deep should each tread be?
The 2021 IRC requires at least 10 inches for stairs within its scope. Check local requirements and measure the finished tread, not just the paver before installation.

Do paver steps need a slope?
Yes, the tread should shed water away from the building. A typical target is about ¼ inch per foot, while keeping the surface even side to side and the risers consistent.

Can I bond pavers to an existing concrete step?
Only if the concrete is sound, stable, clean, and suitable for the chosen system. Use an exterior-rated bonding product approved for the materials and exposure, and follow its preparation and curing instructions.

How thick should the aggregate base be?
There is no universal thickness. Soil, frost, loading, and local conditions determine the design; follow project specifications and local requirements.

Should I use mortar under every paver?
Use the bedding or bonding system specified for the installation. Avoid isolated mortar dabs or any method that leaves voids beneath the pavers.

Do outdoor paver steps need handrails?
They may, depending on the stair’s use, location, and locally adopted code. Check permit requirements before construction.

Should I seal paver steps?
Only when the paver manufacturer recommends it and the sealer is compatible. Follow the product instructions for preparation and timing.

What causes one paver step to sink or tilt?
Common causes include unstable soil, uneven compaction, poor drainage, or frost movement. Correct the support and water problem before resetting the paver.

Final checks before use

Before treating the steps as complete, compare every finished rise and tread with the approved layout and the rules that apply. Confirm that pavers are fully supported, edges are restrained, water drains away, and joints and transitions are finished as specified. If a step moves or holds water, correct the cause before the stairs are used.

(This article was written by one of our staff writers, Alan Kensington. Visit our Meet the Team page.)