Retaining Walls in the New Orleans Metro: When You Actually Need One

Written by Big Easy Paver Patios

Why a Flat Region Uses Retaining Walls

Quick Answer: Most of this metro is flat, so homeowners assume retaining walls are for hillside properties. In practice we build them constantly, just for different reasons: creating raised planting beds that drain in soil that otherwise stays wet, holding a grade change at a raised home or between a yard and a lower neighboring lot, separating a patio from a lawn, and doubling as seating. On the Northshore, where there’s more actual topography, the traditional grade-holding use is more common.

Water Is the Design Problem

A retaining wall doesn’t usually fail because the soil is too heavy. It fails because water builds up behind it.

Saturated soil is much heavier than dry soil, and standing water behind a wall adds hydrostatic pressure directly. In a region with intense rainfall and a high water table, that’s the load case that matters. A wall built without drainage in this soil is a wall on a timer.

Proper construction includes a compacted base, free-draining aggregate behind the wall, a perforated drain pipe with somewhere real to discharge, geotextile separating the drainage stone from soil, and weep points where appropriate. None of it is visible when finished, which is exactly why it gets skipped on cheap bids.

That discharge point deserves attention. A drain pipe that ends nowhere is decorative. Our post on fixing backyard drainage covers where water can actually go on a flat lot, and drainage and grading is often part of the same project.

Why Segmental Block Suits This Soil

Segmental retaining wall systems are built from individual units, often with a lip or pin that locks courses together, set on a compacted base without mortar.

The advantage on delta soil is the same argument that favors pavers over poured concrete: a flexible system tolerates minor ground movement without cracking. A rigid mortared wall on ground that settles unevenly develops cracks, and cracks in a retaining wall are a structural concern rather than a cosmetic one. The comparison is laid out in pavers vs concrete in New Orleans.

Segmental units also come in finishes that coordinate with paver patios, which matters when the wall is a visible part of the outdoor space.

Common Uses in Metro Yards

Raised Planting Beds

The most frequent request. Raising beds above grade gets root zones out of saturated soil, which is a genuine horticultural problem here. A low wall solves it and defines the space.

Seating Walls

A wall at seating height around a patio adds capacity without furniture and holds a grade change at the same time. Popular around fire features and dining areas.

Grade Transitions at Raised Homes

Raised houses create level changes between the structure, walks, and yard. Walls handle that transition cleanly and pair with steps and stoops.

Courtyard Definition

On tight lots a low wall defines an outdoor room and adds privacy. See New Orleans courtyard ideas.

Height, Engineering, and Permits

Above a certain height, retaining walls generally require engineered design and permitting, and reinforcement such as geogrid tied back into the retained soil. The threshold and requirements vary by jurisdiction, so confirm with your parish or municipal office during planning rather than after the wall is up.

Terracing two lower walls instead of one tall one is often a better answer aesthetically and structurally, and it can keep you under thresholds. Surcharge matters too: if a driveway, structure, or slope sits above the wall, the design load changes. Say so at the estimate. Our post on patio permits covers the general local process.

Signs an Existing Wall Is in Trouble

• Leaning or bulging, particularly in the middle of a run
• Courses separating or units sliding out of alignment
• Water seeping through the face after rain, or no drainage outlet at all
• Soil washing out from behind the top course
• Settlement or cracking in a patio or walk above the wall

These are usually drainage symptoms. Address the water and rebuild properly, since resetting units without fixing drainage repeats the failure. Related settling in adjacent hardscape is handled through paver repair and releveling.

Frequently Asked Questions

How tall can a wall be without engineering?

It depends on your jurisdiction, wall type, and what sits above it. Confirm locally during planning.

Can a retaining wall double as seating?

Yes, and it’s common. It needs the right height and a cap detail that’s comfortable to sit on.

Do I need drainage on a low wall?

Even low walls benefit from proper backfill and an outlet in this soil. Water is the failure mode regardless of height.

What about tree roots?

Building near mature live oaks needs care for the tree and the wall. Roots can displace units over time, and cutting major roots can harm the tree.

Get the Water Handled First

We design walls with the drainage as the starting point, not an add-on, and we’ll tell you if what you actually need is a drainage fix rather than a wall.

Big Easy Paver Patios serves Mandeville, Slidell, and the wider metro. See retaining walls or call (504) 688-4244.