Slopeify

Retaining wall guides

Clear answers to the questions people actually ask before they build, grounded in the same codes the calculator uses.

How Much Does a Retaining Wall Cost in 2026?
Retaining wall costs by material, height, and region, real project example, and how to get your exact price with our free calculator.
8 min read
Do I Need a Permit for a Retaining Wall?
The 4-ft rule, the surcharge exception, and how height is really measured — check your wall's permit status free with Slopeify.
9 min read
Retaining Wall Drainage: Why Walls Fail and How to Fix It
Water wrecks most retaining walls. See the drain rock, pipe and fabric system that stops it, plus common mistakes to avoid.
9 min read
Block vs Concrete vs Timber Retaining Walls: How to Choose
Segmental block, poured concrete, timber and boulder walls compared on cost, lifespan and DIY difficulty — find your best fit.
9 min read
How to Build a Retaining Wall (Block), Step by Step
Build a segmental block retaining wall that lasts decades: step-by-step instructions, quantities and drainage tips from our free calculator.
9 min read
When Does a Retaining Wall Need Geogrid Reinforcement?
Find out exactly when your retaining wall needs geogrid reinforcement, how it's sized, and what it costs — check your wall for free.
8 min read
Retaining Wall Soil and Backfill: What Actually Matters
Backfill pushes, foundation soil holds. See IBC pressure and bearing numbers by soil type, then check your wall free with Slopeify.
9 min read
How Many Retaining Wall Blocks Do I Need?
Work out your exact block, cap, and base stone quantities with a simple length x height formula and a full worked example.
9 min read
Gravity vs Cantilever Retaining Walls
Gravity or cantilever retaining wall? Compare cost, height limits, and base width, then size yours with Slopeify's free calculator.
8 min read
Why Retaining Walls Fail (and How to Avoid It)
The four real reasons retaining walls fail, the warning signs to watch for, and what repairs cost. Check your wall's numbers free.
9 min read
Terraced Retaining Walls: Two Short Walls vs. One Tall Wall
Learn when terracing beats one tall wall, the spacing rule, drainage, and planting tips. Try Slopeify's free calculator.
10 min read
Retaining Wall Engineering Basics: The Three Checks
How retaining walls resist tipping, sliding and sinking, with the maths, a worked example and the code checks behind each.
11 min read
Retaining Wall Cost Per Linear Foot (2026 Guide)
See real cost-per-linear-foot ranges by material and height, why height changes everything, and how to compare quotes fairly.
8 min read
Retaining Wall Surcharge Explained
Driveways, sheds and parked cars all add surcharge load to a retaining wall. See how it's calculated and when it forces an engineered design.
9 min read
Retaining Wall Footing Depth: The Right Number
Frost depth or bearing soil, whichever is deeper. See real depth-by-state numbers and check your wall free with our calculator.
10 min read
Tiered Retaining Wall Spacing: Getting It Right
The 2x-height spacing rule for tiered retaining walls, worked examples by wall height, and surcharge maths. Check your layout free.
10 min read
Gravity Retaining Wall Sizing Explained
How to size a gravity retaining wall's base width by height, soil type and material density, with worked examples and a free calculator.
10 min read
Segmental Retaining Wall Blocks: Design Guide
How segmental retaining wall blocks, batter and MSE reinforcement actually work — plus a free calculator to size your wall correctly.
8 min read
Retaining Wall Permits: A State-by-State Guide
Confused about retaining wall permit rules? See the height thresholds, real costs and state quirks, then check your wall with our free calculator.
9 min read
CMU Retaining Wall Design: When Blocks Beat SRW
CMU retaining wall design explained: rebar spacing, footing depth, cost per sq ft, and when SRW beats grouted block. Get the numbers right first.
9 min read
Retaining Wall on a Slope: Key Design Rules
Sloped backfill adds real pressure to a retaining wall. See how much, what it changes, and how to design it right with our free calculator.
9 min read
Retaining Wall Near a House Foundation: Safe Setbacks
How close can a retaining wall sit to your foundation? The 45-degree rule, lateral load risks, and when you need an engineer.
9 min read
Railroad Tie Retaining Wall: Pros, Cons & Cost
Railroad tie retaining walls cost $20-40/sq ft but last only 15-25 years. See when timber works, when it doesn't, and how to compare it.
9 min read
Retaining Wall Maintenance: Annual Inspection Checklist
Free annual retaining wall maintenance checklist: drainage, cracks, warning signs, and when to call an engineer. Check yours today.
10 min read