What is a segmental retaining wall?

If your yard has a steep slope, erosion issues, or you’re simply looking to create more usable space outdoors, you’ve probably looked into retaining walls, and maybe you’ve come across something called a segmental retaining wall.

 

At Paragon Hardscapes, we install these walls across Knoxville and surrounding counties, and they’re one of the most popular choices among homeowners. But are they the right choice for your property? In this article, we’ll break down exactly what a segmental retaining wall is, the benefits, what to watch out for, and how much you can expect to spend.

What Is a Segmental Retaining Wall?

A segmental retaining wall (SRW) is a hardscape structure made from modular concrete blocks that interlock without the use of mortar. These blocks are stacked in a specific pattern to retain soil, support landscape changes, and manage elevation. They’re especially effective on sloped or uneven terrain.

 

Pros of Segmental Retaining Walls

  • Strong and Long-Lasting – When installed properly, these walls can last decades and handle significant pressure from soil and water.
  • Engineered for Bigger Challenges – With proper design and geogrid reinforcement, segmental walls can safely be built well over 4 feet tall. We regularly construct structural walls exceeding 10 feet in height with engineering support.
  • No Mortar Needed – The dry-stack system simplifies construction and makes it easier to replace or modify sections in the future.
  • Design Flexibility – Choose from a variety of colors, shapes, and textures to complement your outdoor space.
  • Cost-Effective – Typically more budget-friendly than poured concrete or natural stone while offering similar performance.

What to Watch For with Segmental Retaining Walls

These walls are a great solution for many landscapes, but like any structure, they need to be built correctly:

  • Engineering Is Required for Taller Walls – In Tennessee (and most states), retaining walls exceeding 4 feet in height must have an engineered plan to comply with local codes. That’s not a downside—it just ensures safety, longevity, and proper drainage.
  • Poor Installation Leads to Failure – Without proper base preparation, drainage system, and block alignment, even the best materials can fail. DIY shortcuts often lead to leaning walls or blowouts within a few years.
  • Not Ideal for DIY Projects – While block systems may seem simple, the site preparation, setbacks, drainage, and geogrid reinforcement make this a job best handled by professionals.

What Do Segmental Retaining Walls Cost in Knoxville?

Costs depend on height, access, soil conditions, and material choice, but here’s a ballpark:

  • $80–$120 per square foot (installed)
  • Small garden wall: $9,000–$16,000
  • Medium to large engineered wall: $20,000–$30,000+

We provide a clear scope and pricing for each project, including engineering support when needed.

Recommended Brands We Use

We install segmental walls using trusted products made for East Tennessee’s climate and terrain. Some of our go-to materials include:

  • Belgard Diamond Pro – Ideal for taller, engineered walls and achieving clean, straight-line aesthetics.
  • Belgard Highland Stone – Offers a more natural, stone-like appearance with a split-face texture.
  • Acme Gravity Wall Block – A dependable and cost-effective choice available locally.

Final Thoughts: Is It Right for You?

Segmental retaining walls provide the ideal balance of strength, flexibility, and aesthetics for numerous outdoor projects. Whether you need to hold back a slope, carve out a level patio area, or create usable space in a hilly yard, they’re an excellent long-term investment.

At Paragon Hardscapes, we walk you through each step of the process—from design to engineering to final build—so you can feel confident that your wall will look great and perform for decades.

 

Have questions? Want to see what a segmental wall would look like at your home? Reach out to schedule a no-pressure consultation.