The cost to build a retaining wall will depend primarily on the type of wall you build. When choosing the type of retaining wall you want, it's essential to consider several factors:
Establish the intended purpose of the retaining wall.
Determine the length and height it needs to be.
Understand moisture conditions where you plan to have your wall built.
Know the look and style you’re going for.
Decide on your budget for the project.
A contractor or local residential structural engineer should be able to help you determine which materials make the most sense for your particular wall type. Keep reading to find out your options and their prices.
Concrete Retaining Wall
Concrete retaining walls cost $10 to $100 per square face foot (or the square feet of the face of the wall). You can choose from poured, split-face block, or CMU (cinder block). You may also use veneers on poured and cinder walls, but the split-face look comes with a rock-like texture and various colors.
Wood or Timber Retaining Wall
Wooden retaining walls average $15 to $30 per square foot. They typically last five to 20 years and are a favorite for gardens because of their natural appearance. You can easily find this cost-effective material locally. The downside of using wood is that it’s susceptible to rot and water damage. However, drainage and waterproofing during installation can make this style last decades.
Gabion and Stone Retaining Wall
Stone retaining walls cost $5 to $100 per square foot. Prices range from the inexpensive and practical gabion to the high-end stacked stone and limestone options.
Brick Retaining Wall
Brick walls cost $10 to $45 per square foot. Bricks can act as a veneer in a retaining wall, meaning they're only one brick thick (a wythe), typically outside of poured or block concrete. They're often only suitable up to about 4 feet in height when used alone, but above that height, you'll want to have them two wythes thick for better stability.
There are many metal retaining wall options to choose from, including sheet piling, corten, and I-beam. Keep in mind that metal rusts over time and works better in some climates than others, but it can last for many decades if installed and treated properly, with galvanized steel lasting the longest in coastal environments.