Walls are priced by the face: length times exposed height. A 30 foot wall standing 3 feet out of the ground is 90 face square feet. At the example rate of $32 per face square foot, that is $2,880. Simple math, but only if you know what the rate covers and what rides along as its own line.
What lives inside the face rate
The per-face-foot rate should carry the standard build: excavating the base trench, compacted base material, the buried first course, block, and the labor to stack it true. That buried course matters for pricing, because the customer sees 3 feet of wall while you are building more than that. Price the wall you build, not the wall they see.
Like any unit rate, build it from your real costs: block price, base rock, crew hours per course, overhead, margin. The cost build-up discipline in what to charge per square foot for flatwork applies here foot for foot.
Drainage and geogrid are line items
A retaining wall fails from water and from soil pushing back, and the defenses against both scale with the site, not the face footage.
- Drainage. Clean gravel backfill and perforated pipe behind the wall, daylighted somewhere sensible. A wet site or heavy clay needs more of it than a dry sandy one, so it goes on the quote as its own line, sized to the site.
- Geogrid. Taller walls and walls holding back a surcharge need reinforcement layers tied back into the soil. Grid is material plus significant extra excavation, so it is never free and never hidden in the rate.
Itemizing these does more than protect your margin. It shows the customer why your wall costs more than the lowball bid that skipped both.
Know when engineering enters
Somewhere above garden-wall height, a retaining wall becomes a structure, and local code decides exactly where. Height is the usual trigger, and slopes above the wall or loads like a parked truck can pull the threshold down. Do not guess at the line. Price a call to the building department into every wall bid, and when a job needs stamped drawings, that cost and timeline go in the quote up front.
Small walls have the opposite problem: tiny face footage that cannot carry the mobilization. That is minimum job charge territory.
Run wall numbers on the retaining wall cost calculator. PriceDesk runs the same math with your face rate and your line items on your phone. Free for 14 days, no card to start.