Retaining Walls
Retaining Walls in Delaware
Retaining walls by Tri-County Construction — poured concrete, modular block, and segmental walls with drainage, geo-grid, and below-frost-depth footings across New Castle County and Delaware. Family-owned, licensed & insured, 4.7★ (21 Google reviews). Free estimates: (302) 419-3232.
Engineered retaining walls for sloped yards, driveway cuts, terraced gardens, flood control, and replacing failed timber or railroad-tie walls.
- Poured concrete, modular block, and segmental options
- Engineering review for walls over 4 feet
- Drainage behind every wall
- Footings below frost depth and geo-grid on tall walls
4.7· 26 Google reviews
Licensed & Insured
DE concrete contractor
18+ Years
Family-owned · father & son
4.7 / 5
26 Google reviews
Local Crew
Based in New Castle, DE
Why homeowners pick Tri-County
Built for Delaware weather, finished to last
Drainage Behind the Wall
Most wall failures are water failures. We install gravel and perforated pipe behind the wall so pressure does not build up.
Engineering When Required
Walls over 4 feet in Delaware require engineering. We bring that review in instead of guessing at soil load and surcharge.
Built Below Frost
Footings below frost depth and geo-grid tie-backs on tall walls help the structure resist movement. The hidden work is what makes the wall last.
Details
A retaining wall is structure first, landscape second.
If your property has a slope, driveway cut, eroding bank, or rotting railroad-tie wall, the replacement needs to hold back more than dirt. A retaining wall has to manage lateral pressure, water, freeze-thaw movement, and whatever load sits above it. Tri-County Construction builds retaining walls across Delaware for sloped yards, terraced gardens, driveway embankments, HOA drainage projects, and flood-control needs.
The right wall system depends on height, soil, access, drainage, and the look you want. Modular block can be faster and more cost-effective under 4 feet. Poured concrete is stronger and slimmer for tall walls or tight spaces. Boulder and segmental systems can fit landscape designs where a softer edge matters.
Drainage is non-negotiable. Every wall needs gravel and perforated pipe behind it so water does not freeze and push the wall forward. Walls over 4 feet require engineering review in Delaware, and tall walls may need geo-grid tie-backs into stable soil. Built correctly, a retaining wall should last 30–50 years.
Service area
Concrete contractors across New Castle County, DE
Tri-County Construction LLC is based in New Castle and serves homeowners and businesses throughout the county.
- Wilmington, DE
- New Castle, DE
- Newark, DE
- Hockessin, DE
- Middletown, DE
- Glasgow, DE
- Bear, DE
Useful links
Our process
From the first estimate to the final cure
- 01
Free On-Site Estimate
We walk the site with you, measure square footage, review drainage and grading, and explain exactly what your project needs — no upsells, no surprises.
- 02
Excavation & Prep
We remove old surfaces, set the base to spec, install rebar or wire mesh, and form the pour to match your finished elevations.
- 03
Pour, Finish & Cure
Our crew pours, finishes, and details every joint by hand. We protect the cure window so your concrete reaches full strength.
FAQ
Common questions
Don't see your question? Call (302) 419-3232 or send a quick note through the contact form — we usually reply same-day.
How tall can a retaining wall be without engineering?
4 feet in Delaware before engineered drawings and permits are required. Anything taller goes through a structural engineer.
Block wall vs. poured concrete wall?
Block is faster and usually cheaper for walls under 4 feet. Poured concrete is stronger and slimmer for tall walls or tight spaces.
How long do retaining walls last?
Properly built walls last 30–50 years. Bad drainage and skipping geo-grid on tall walls are the common failure points.
What affects the cost of a retaining wall in Delaware?
Cost factors include wall height and total linear footage, material type (modular block vs. poured concrete vs. segmental), drainage system (gravel and perforated pipe), geo-grid requirements on tall walls, excavation and material access, and whether engineering review is needed for walls over 4 feet. Every project gets a free on-site estimate — call (302) 419-3232.
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Learn moreBook a Free Concrete Estimate Today
We'll walk your site, scope the project, and give you a clear written estimate — no pressure, no upsells.