How Much Does a Retaining Wall Cost in Los Angeles?

A residential retaining wall in Los Angeles usually costs $30 to $95 per square foot of wall face installed, which puts a 3 ft garden wall in the low thousands and a 5 to 6 ft engineered wall in the $17,000 to $55,000 range once engineering, permits and a geotechnical report are added. The spread is wide because a wall’s load grows with the square of its height, and because the soft costs on a permitted wall can equal the cost of the block.

These are typical Los Angeles budgeting estimates, not a price list or a quote. Your project can come in lower or higher depending on the house, the scope and the finishes; the only real number is a written proposal after a site visit.

For how we build walls and why they fail, see our retaining wall service page.

Cost per square foot of wall face

Walls are priced by the square foot of face measured from the bottom of the footing to the top, because the footing, the rebar and the block thickness are all set by height. A 4 ft wall with a 1 ft footing is 5 sq ft of face per linear foot.

Wall type	Installed cost per sq ft of face	Where it makes sense
Timber	$20–$40	Garden walls under 3 ft. Not for driveways or slopes.
Segmental (interlocking) block	$30–$60	Terrace and garden walls; geogrid above about 3 ft.
CMU block, rebar and grout	$35–$75	The standard engineered wall, 4 to 8 ft.
Poured concrete	$45–$95	Tall walls, heavy surcharge, curves.
Stone veneer over CMU	$70–$140	Block wall plus a stone finish.

Cost per linear foot by height

Per linear foot figures only mean something once the height is fixed. These include the footing and the drainage behind the wall, and exclude engineering, permits and demolition.

Wall height and type	Installed cost per linear foot
2–3 ft garden wall, timber	$60–$120
2–3 ft garden wall, segmental block	$90–$180
2–3 ft garden wall, CMU	$120–$250
4–6 ft engineered CMU wall	$250–$400
4–6 ft poured concrete wall	$350–$500
6–8 ft hillside wall, CMU or poured	$400–$650

Notice the jump between 3 ft and 5 ft. A 5 ft wall carries roughly three times the soil pressure of a 3 ft wall, so the footing gets wider and deeper, the bar gets heavier and closer together, every cell gets grouted, and an engineer has to prove it on paper.

Three worked examples

Example	Wall	Engineering	Geotechnical report	Permit and plan check	Access	Total
3 ft garden wall, 40 ft, segmental block	$3,600–$7,200	None if under 4 ft from the footing with nothing behind it	None	None	Included	$3,600–$7,200
3 ft garden wall, 40 ft, stuccoed CMU	$4,800–$10,000	None	None	None	Included	$4,800–$10,000
5 ft engineered CMU wall, 60 ft, below a driveway	$15,000–$24,000	$1,500–$8,000	Usually none on a flat lot	$500–$2,500	Included	$17,000–$35,000
6 ft hillside wall, 50 ft, CMU or poured	$20,000–$32,500	$3,000–$8,000	$3,000–$8,000	$1,000–$2,500	$500–$1,500+	$28,000–$55,000

The garden wall needs no permit if it stays at or under 4 ft measured from the bottom of the footing and nothing sits behind it. If a Bobcat can reach the back yard, expect the low end; if the block and base rock come through a 36-inch side gate by wheelbarrow, expect the high end. One to two weeks.

The driveway wall is over the threshold twice: the height once the footing is counted, and the driveway, which is a surcharge. Stamped engineering and a permit are not optional. Two to four weeks of engineering, two to six weeks of plan check, two to three weeks of construction.

The hillside wall adds a geotechnical report with borings and lab work, structural engineering designed to that report’s soil pressures, and the access premium that is almost a given on a hillside lot. Three to five months from first site visit to finished wall.

What adds cost

Item	Typical cost	Why
Height	Load grows with the square of the height	Wider footing, heavier bar, every cell grouted. Two 3 ft terraced walls are often cheaper than one 6 ft wall.
Structural engineering	$1,500–$8,000	Required over 4 ft from the footing or with any surcharge. More if the engineer also designs drainage and guardrail.
Geotechnical report	$3,000–$8,000, more with multiple borings	Required on hillside lots in the City of Los Angeles and many other cities; sometimes on flat lots with known expansive clay.
Drainage tie-in	About $90 per linear foot	Pipe, gravel and fabric behind the wall are in the per-foot ranges; running the pipe to the street or a dry well is separate.
Imported backfill	Rises with height	Valley clay is expansive and the engineer will not allow it behind the wall.
Difficult access	Adds $500–$1,500+	Wheelbarrow and pump instead of Bobcat and truck. Top of the range on tight hillside lots.
Demolition of a failed wall	$25–$60 per linear foot	Includes haul-off. The slumped slope behind it has to be cut back further than the first builder did.
Permit and plan check	$500–$2,500	Set by the city and the valuation of the work.
Finish	Veneer roughly doubles a block wall	Stucco, a precast or poured cap, and stone veneer are each a line item.

Permits

Retaining walls over 4 ft, or any wall carrying a surcharge, need a building permit. In the City of Los Angeles and in Los Angeles County’s unincorporated areas, the 4 ft is measured from the bottom of the footing to the top of the wall, which is the California Building Code exemption wording, and it catches a lot of walls that look like 3-footers from the lawn. Hillside lots in the City of Los Angeles fall under the grading code, which requires a soils engineer and an engineering geologist on hillside grading work. Cities differ, and we confirm the requirement for your address before we price the job.

A permitted wall gets two inspections that matter: the footing before the pour and the rebar before the grout. We pull the permit, schedule the inspections and close it out. An unpermitted wall over 4 ft is a problem at escrow and, if it fails onto a neighbor’s property, a much bigger one.

Timeline

A garden wall with no permit: one to two weeks once we start. A permitted wall: two to four weeks for engineering, two to eight weeks of plan check depending on the city and the geotechnical report, then two to four weeks of construction. Grout cures before we backfill and pours wait for dry weather, so a wall started in December takes longer than one started in May.

Retaining walls as part of a bigger project

A wall is usually the first step in something else: a flat lawn, a paver terrace, a pool level, a patio cover on the reclaimed ground. Building it inside a backyard remodel lets us grade and drain the whole yard once instead of twice. A wall near the house or holding up the pad it sits on becomes foundation work. See pricing for how we write proposals and financing for how homeowners pay for larger walls.

We build walls across Los Angeles County and the San Fernando Valley, Orange County, Ventura County, western Riverside County and western San Bernardino County; hillside lots in Los Angeles County and Ventura County’s foothills carry the geotechnical line, while the larger inland lots in Corona, Murrieta, Ontario and Rancho Cucamonga usually mean longer, lower walls.

Frequently asked questions

How much does a 4 ft retaining wall cost per foot in Los Angeles?

A 4 ft wall with a 1 ft footing is 5 sq ft of face per linear foot, so segmental block runs about $150 to $300 per linear foot and CMU about $175 to $375 installed. At 4 ft above grade the wall is over the permit threshold once the footing is counted, so add engineering and permit fees on top. These are typical Los Angeles budgeting estimates, not a price list or a quote. Your project can come in lower or higher depending on the house, the scope and the finishes; the only real number is a written proposal after a site visit.

Is a poured concrete retaining wall better than block?

Stronger per inch, yes, and the right answer for tall walls, heavy surcharges and curves. For most 4 to 8 ft residential walls, a grouted CMU wall on an engineered footing does the same job for less, because forming concrete is labor and laying block is faster. If block is enough for your wall, we will say so.

Do I need a geotechnical report for a retaining wall?

On a designated hillside lot in the City of Los Angeles, and in many other cities, yes. On a flat lot with a 5 ft wall and no unusual soil, the structural engineer can often design from presumptive soil values without one. The report costs a few thousand dollars and adds two to four weeks, but it lets the engineer size the wall for the soil that is actually there instead of a worst-case assumption.

Why did my old retaining wall fail after 20 years?

Almost always water. A wall built without gravel and a drain pipe behind it holds up through dry years and fails in a wet winter when the soil saturates and the pressure climbs. The other common causes are no footing, no engineering on a wall that needed it, and expansive clay backfill. Age alone does not fail a properly drained block wall.

Can I save money by building two shorter walls instead of one tall one?

Often, yes. Two 3 ft terraced walls with a planter between them can cost less than one 6 ft wall, avoid engineering if each stays under 4 ft from the bottom of its footing, and look better. It only works if the lot has depth for the terrace and the upper wall’s footing sits far enough back that it does not surcharge the lower wall. We check that at the site visit.

How long does a retaining wall take to build?

One to two weeks of construction for a garden wall, two to four weeks for an engineered wall, after engineering and plan check that can take one to three months on a hillside lot. Much of the construction time is curing: the footing before the block goes up, the grout before we backfill. Rain stops pours, so winter walls take longer.

If you have a slope to hold or a wall that is leaning, ask for a free site visit. We will measure the wall, check the soil and the drainage, tell you whether it needs an engineer, and send a written proposal within 48 hours.