# Poured concrete cost

> Poured concrete cost: practical numbers, costs, and trade-offs, written independently.

Canonical: https://retainingwalllab.com/poured-concrete-cost/

Last updated: 2026-11-09

A poured concrete retaining wall costs $25 to $60 per square foot installed, the top of the common range and the most durable option on a site that can carry it. A 40 ft wall at 4 ft high is 160 sq ft, so the wall runs $4,000 to $9,600. Add $5 to $15 per square foot for drainage and backfill — $800 to $2,400 on that wall — and the project is $4,800 to $12,000.

## What the rate covers

**A poured concrete retaining wall** is a cast-in-place structure formed and poured on site, with steel reinforcement, a footing, and a drainage detail behind the wall. The installed rate covers the concrete, the formwork, the rebar, the placement, the stripping, and the basic finish.

It does not cover excavation, spoil haul-off, drainage pipe and gravel, permit fees, or engineering. Those are separate lines, and on a tall wall the engineering is not optional.

## Cost per square foot, with arithmetic

The published rates are block at $15 to $35 per square foot, poured concrete at $25 to $60, timber at $10 to $25, gabion at $20 to $40, boulder at $20 to $45, and drainage and backfill at $5 to $15.

For a 40 ft wall at 4 ft high: 40 × 4 = 160 sq ft. At $25 per square foot, 160 × $25 = $4,000. At $60, 160 × $60 = $9,600. The midpoint is ($4,000 + $9,600) ÷ 2 = $6,800.

Add drainage and backfill: 160 × $5 = $800 to 160 × $15 = $2,400. Total project at the low end is $4,000 + $800 = $4,800; at the high end, $9,600 + $2,400 = $12,000.

| System | Rate per sq ft | 160 sq ft wall |
|---|---|---|
| Timber | $10–$25 | $1,600–$4,000 |
| Segmental block | $15–$35 | $2,400–$5,600 |
| Gabion | $20–$40 | $3,200–$6,400 |
| Boulder | $20–$45 | $3,200–$7,200 |
| Poured concrete | $25–$60 | $4,000–$9,600 |

## Why concrete costs more than block

Poured concrete and segmental block do the same job, and the price gap is explained by three things: the formwork, the cure time, and the equipment.

Block is laid unit by unit with a small crew and no curing delay. Concrete needs forms built on both faces, rebar tied and inspected, a pump or a chute that can reach the wall line, and a cure period before the forms come off. On a short wall, that overhead is spread over few square feet and the rate sits near the top of its range.

The payback is service life and rigidity. A poured wall is one continuous structure with no joints for roots and water to exploit, and it does not need re-laying when a unit cracks. On a site with a heavy surcharge load or a long design life, that is worth the premium; on a garden wall in a dry corner, it usually is not.

## Formwork and rebar: where the money goes

The concrete itself is rarely the largest line. Forms, labor, and reinforcement usually are.

A wall 4 ft high needs forms on both faces, braced against the pour pressure, and the formwork is built, oiled, set, stripped, and cleaned for every pour. Rebar has to be cut, tied, and spaced to the engineer's drawing, with the correct cover so it does not corrode. A wall with a decorative finish, such as board-form or exposed aggregate, adds a finishing line on top.

That is why a 4 ft wall costs more per square foot than a 8 ft wall. The formwork and setup are similar; the square footage is double, so the fixed costs spread thinner.

## Drainage and backfill arithmetic

Drainage is not optional on a concrete wall, because concrete is impermeable. Water that collects behind it has nowhere to go except through the wall or around it, and the pressure it creates is what tips walls over.

The detail is a gravel envelope, filter fabric, a perforated pipe at the footing, and an outlet that daylight. At $5 to $15 per square foot: 160 × $5 = $800 to 160 × $15 = $2,400.

Many quotes fold part of this into the wall rate. Ask which part, and get the answer in writing. A quote that excludes the outlet or the gravel is not a complete wall.

## Three worked examples

| Wall | Face area | Wall only | With drainage |
|---|---|---|---|
| 20 ft × 3 ft | 60 sq ft | $1,500–$3,600 | $1,800–$4,500 |
| 40 ft × 4 ft | 160 sq ft | $4,000–$9,600 | $4,800–$12,000 |
| 60 ft × 4 ft | 240 sq ft | $6,000–$14,400 | $7,200–$18,000 |

The arithmetic for the first row: 60 × $25 = $1,500 to 60 × $60 = $3,600, plus 60 × $5 = $300 to 60 × $15 = $900. The third: 240 × $25 = $6,000 to 240 × $60 = $14,400, plus $1,200 to $3,600.

## When poured concrete is the wrong buy

Poured concrete is the wrong buy on a low garden wall where block is cheaper and looks better, and on a site where a truck or pump cannot reach the wall line. It is also the wrong buy when the budget has no room for engineering on a wall above 4 ft, because a tall concrete wall is exactly the structure that needs it.

It is the right buy where the wall carries a driveway, a structure, or a heavy surcharge, and where a long service life matters more than the initial rate.

## How to budget it

1. Measure the face as length × height, and add the return walls at each end.
2. Multiply by $25 to $60 to get the wall range.
3. Add drainage and backfill at $5 to $15 per square foot.
4. Add excavation and spoil haul-off as separate lines, since concrete walls need a wide trench.
5. Add permit and engineering for any wall above the local threshold, and assume engineering above 4 ft.
6. Get the reinforcement and the drainage detail on the drawing before comparing quotes.

For the wall-type comparison, see [concrete retaining wall cost](https://retainingwalllab.com/concrete-retaining-wall-cost/). For the build sequence, see [poured concrete installation](https://retainingwalllab.com/poured-concrete-installation/). For the failure modes, see [poured concrete problems](https://retainingwalllab.com/poured-concrete-problems/), and for how the rate compares across materials, see [retaining wall cost per square foot](https://retainingwalllab.com/retaining-wall-cost-per-square-foot/).