How do I estimate the cost of a block retaining wall?

Count the blocks and caps, the base for the leveling pad and the drainage stone, then multiply each by its local price. Add drain pipe, labor (often quoted per square foot of wall face) and lump sums for excavation, delivery and disposal. Divide the total by the face area for a cost per square foot.

Why are retaining walls priced per square foot of face?

Because the work grows with both length and height. A 40 ft wall 2 ft tall and a 20 ft wall 4 ft tall both have 80 sq ft of face, though the taller wall often costs more per square foot because it may need geogrid, more excavation and engineering.

What makes a retaining wall more expensive?

Height (especially above about 3 to 4 ft, where geogrid, permits and engineering often come in), poor or wet soil, loads above the wall such as a driveway, curves and corners, steps in the base, the block chosen, tight access and removal of an old wall.

Is a block wall cheaper than a poured concrete or timber wall?

It depends on local prices and the wall. Get quotes for each type on the same length, height and drainage. Block walls can be built without forms or curing time and are often within reach of a DIYer at low heights.

Retaining Wall Cost Calculator: Blocks, Gravel and Labor

Enter the wall size and block, then the prices from your local yard or installer. The slip totals blocks, caps, gravel, drain pipe, labor and extras, and divides by the wall face to give a cost per square foot you can compare with quotes.

How to use it

Enter the wall. Length, height above ground and the block size. The buried course is added automatically.
Enter prices. Blocks and caps by the piece; base and drainage stone by the ton; drain pipe by the foot; labor per square foot of wall face; and excavation, delivery and anything else as one lump sum.
Read the total and the cost per square foot of face at the top of the slip.

total = blocks × $/block + caps × $/cap + pad tons × $/ton + drain tons × $/ton + pipe ft × $/ft + face sq ft × labor + other
cost per sq ft of face = total ÷ (length × height above ground)

A quantity worksheet

Here is what goes into a 20 ft long, 2 ft high wall in 8 × 16 in blocks. Put your own prices against each line.

Line	Quantity	Priced by
Wall blocks	63 (4 courses of 15, + 5%)	piece, sq ft of face, or pallet
Cap units	16	piece or linear foot
Leveling pad base	0.74 cu yd, about 1.1 tons	ton or cubic yard
Drainage stone	1.6 cu yd, about 2.2 tons	ton or cubic yard
Perforated drain pipe	20 ft, plus fittings	foot or roll
Filter fabric (if used)	wall length × a little more than the wall height	roll
Cap adhesive	coverage per tube from the label	tube
Labor	40 sq ft of face	sq ft of face
Excavation, haul-away, delivery	—	lump sum

Labor is the line that changes most between quotes, and excavation is often hidden inside it. Ask installers to say how deep they dig, how wide the trench is, and what they do with the soil.

What drives retaining wall cost

Height. Every extra course adds blocks, drainage stone and labor. Above about 3 to 4 ft (the line depends on the block and soil), geogrid reinforcement, more excavation, permits and an engineer’s design often come in, and the cost per square foot can jump.
What the wall holds back. A slope, a driveway or a building above the wall adds load and usually means more reinforcement.
Soil and water. Clay and wet ground need more drainage and sometimes a deeper base.
Shape. Curves, corners, stepped bases and stairs take more time and more cut blocks.
Block choice. Small garden blocks, large-format blocks and natural stone all differ in price per square foot of face, and in how quickly they go up.
Access. Blocks and stone that have to be carried by hand around a house cost more to place than ones a machine can set next to the wall.
Demolition. Removing an old timber or failed block wall adds tear-out and disposal.

DIY or hire out?

Low garden walls, up to around 2 to 3 ft, are a common DIY project with small blocks that one person can lift. The work is mostly digging, compacting a level pad and getting the first course dead level. Taller walls, walls that hold up a driveway or a building, and walls on wet or unstable ground are where an experienced installer and often an engineer earn their fee.

For a DIY budget, leave labor at zero and add tool rental (plate compactor, a saw with a masonry blade) and delivery to the “other” box.

Compare quotes on the same wall

When quotes differ a lot, line them up on:

The block product and the number of courses, including buried ones.
Leveling pad depth and width, and whether it is compacted in lifts.
Drainage: stone width, pipe, outlets and fabric.
Geogrid layers and lengths on taller walls.
Who handles permits and inspections.
Cleanup, soil removal and warranty.

The retaining wall block calculator explains each quantity in detail.

This site doesn't list typical prices, because block, stone and labor prices vary widely by region and over time. Use prices from your own suppliers and installers.

Questions people ask

How do I estimate the cost of a block retaining wall?: Count the blocks and caps, the base for the leveling pad and the drainage stone, then multiply each by its local price. Add drain pipe, labor (often quoted per square foot of wall face) and lump sums for excavation, delivery and disposal. Divide the total by the face area for a cost per square foot.
Why are retaining walls priced per square foot of face?: Because the work grows with both length and height. A 40 ft wall 2 ft tall and a 20 ft wall 4 ft tall both have 80 sq ft of face, though the taller wall often costs more per square foot because it may need geogrid, more excavation and engineering.
What makes a retaining wall more expensive?: Height (especially above about 3 to 4 ft, where geogrid, permits and engineering often come in), poor or wet soil, loads above the wall such as a driveway, curves and corners, steps in the base, the block chosen, tight access and removal of an old wall.
Is a block wall cheaper than a poured concrete or timber wall?: It depends on local prices and the wall. Get quotes for each type on the same length, height and drainage. Block walls can be built without forms or curing time and are often within reach of a DIYer at low heights.

Retaining wall cost calculator