Retaining wall guides

A clear, no-hype breakdown of retaining wall cost by material, height and reinforcement, with the cost-per-square-foot ranges our calculator uses.

The 4-foot rule explained: when IRC R404 and IBC §1807 require an engineered, permitted retaining wall, and when you're in the clear.

Water, not soil, topples most retaining walls. Here's the drainage detail that keeps your design loads valid.

The trade-offs between segmental block, poured concrete, timber and boulder retaining walls: cost, height limits, lifespan and DIY-ability.

A practical sequence for building a segmental block retaining wall, from the base trench to the cap row, with the dimensions our calculator gives you.

Geogrid turns the soil into part of the wall. Here's when a gravity wall isn't enough and how reinforcement is sized.

Why the soil behind and under your wall drives the whole design, and why clean granular backfill beats native clay every time.

A simple way to count blocks, caps, base stone and drain rock for a segmental retaining wall, and the calculator that does it for you.

The two big families of retaining wall, mass/gravity and reinforced cantilever, and when each one wins.

Bulging, leaning, cracking and sliding: the real reasons retaining walls fail and the details that prevent each one.

Terracing a slope with multiple short walls can avoid engineering, but only if the walls are far enough apart. Here's the rule.

Overturning, sliding and bearing: the three stability checks every retaining wall must pass, explained in plain English.

The real cost per linear foot for retaining walls by material and height, based on the installed price ranges our calculator uses. Updated for 2026.

A surcharge (driveway, slope, or structure above the wall) adds soil pressure. Here's how engineers account for it and when it changes the design.

Footing depth for a retaining wall depends on frost depth, soil bearing and wall height. Here's the standard guidance and how our calculator uses it.

Tiered retaining walls only avoid engineering if the terraces are far enough apart. Here is the spacing rule and when tiering beats one tall wall.

A gravity retaining wall relies on its own weight to resist soil pressure. Here's how the design is sized, what the base width means and when gravity fails.

Segmental retaining walls (SRW) are the most popular residential choice. Here's how the design works, when geogrid is needed, and what the calculator shows.

Retaining wall permits are triggered by height, surcharge and location. Here's what the 4-foot rule means and what varies by state and jurisdiction.

Concrete masonry unit (CMU) retaining walls are strong and affordable but different from SRW block. Here's how they compare and when CMU makes the most sense.

Building a retaining wall on a slope changes the load calculation since the backfill slope adds pressure. Here's what changes and how to account for it correctly.

Placing a retaining wall near a foundation adds load to both structures. Here's when you need a setback, an engineer, and what to watch for on site.

Railroad tie retaining walls are fast and cheap but have real limits. Here's what they cost, how long they last and when timber makes no sense for your project.

A simple annual retaining wall maintenance checklist catches small problems before they become expensive failures. For homeowners and contractors alike.