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Retaining wall cost calculator
Enter the wall length and height and pick a material to get a low-to-high installed price range, using one national cost source so the numbers line up from material to material.
These are national ranges; local quotes vary; get a written quote. The ranges come from Fixr’s retaining wall cost guide (updated Jan. 31, 2025), which prices walls per square foot of wall with labor included.
Height is the wall face you’ll see, from the finished grade at the bottom to the top of the wall. For a wall that steps down, measure each section and add them up.
Fixr’s prices include labor. Drainage, geogrid, an engineer’s design, permits and removing an old wall aren’t in these per-square-foot prices. Fixr puts added drainage at $60 to $70 per linear foot of wall and removing an old wall at $10 to $20 per sq ft, so ask for these as separate lines on a written quote.
Check the highlighted box: the length (up to 1,000 ft) and height (up to 20 ft) have to be greater than zero.
National ranges; local quotes vary; get a written quote.
In central PA? See what a retaining wall costs with us, with the fixed prices we charge.
How it works
Wall face = length × height, in feet. Fixr prices retaining walls per square foot of wall, so a wall twice as tall costs about twice as much per foot of length.
Low = wall face × the low end of the material’s installed price per square foot. High = wall face × the high end. Both ends come from the same Fixr tables, with labor included.
Over 3 ft, the calculator flags that many segmental blocks need geogrid. Over 4 ft, it flags Fixr’s structural engineer threshold and Pennsylvania’s UCC permit line, 34 Pa. Code § 403.62(c)(2).
40 ft × 3 ft = 120 sq ft of wall face · segmental block: 120 × $15 = $1,800 · 120 × $35 = $4,200
Boulders: 120 × $25 = $3,000 · 120 × $50 = $6,000
Same wall at 5 ft: 200 sq ft · segmental block $3,000 to $7,000, plus a permit and an engineer’s design in PA
Related: the retaining wall block calculator for the materials list, when a wall needs geogrid, retaining walls over 4 feet, and retaining wall permits by state.
Questions
How much does a retaining wall cost per square foot?
Fixr’s retaining wall cost guide, updated January 31, 2025, lists installed prices with labor included per square foot of wall: segmental block walls $15 to $35, timber $15 to $30, natural stone $25 to $75, boulders $25 to $50 and poured concrete $30 to $40. Square feet means wall length × wall height.
How much does a 40 ft retaining wall cost?
At 3 ft tall, a 40 ft wall has 120 sq ft of face. At Fixr’s installed ranges, that’s about $1,800 to $4,200 in segmental block, $1,800 to $3,600 in timber, $3,000 to $6,000 in boulders, $3,000 to $9,000 in natural stone and $3,600 to $4,800 in poured concrete.
What is the cheapest retaining wall material?
Of the materials in this calculator, timber ($15 to $30 per sq ft) and segmental block ($15 to $35) start lowest in Fixr’s figures. Fixr lists vinyl and railroad-tie walls lower still, at $10 to $15 per sq ft.
When does a retaining wall need an engineer or geogrid?
Fixr says to bring in a structural engineer for a wall more than 4 ft tall, and that walls 4 ft or lower may not need extra reinforcement. Block makers publish their own gravity heights, and several popular blocks top out between 3 and 4 ft, so a segmental wall in that range often needs geogrid. A slope, driveway or clay soil above the wall lowers the limit. Our retaining wall block calculator lists each maker’s number.
Does a retaining wall need a permit in Pennsylvania?
Under the state Uniform Construction Code, 34 Pa. Code § 403.62(c)(2), a retaining wall is exempt only if it is not over 4 ft measured from the lowest level of grade to the top of the wall and doesn’t support a surcharge such as a driveway or a slope. Your township can add its own rules. See retaining wall permit rules by state.
Sources: Fixr, How much does it cost to build a retaining wall?, Adam Graham, reviewed by Cristina Miguelez, updated Jan. 31, 2025 (cost per sq ft, labor included: segmental $15 to $35; timber $15 to $30; boulders $25 to $50; natural stone $25 to $75; poured concrete $30 to $40; vinyl $10 to $15; railroad ties $10 to $15; adding drainage $60 to $70 per linear ft; removing a wall $10 to $20 per sq ft; involve a structural engineer for walls more than 4 ft; walls 4 ft or lower may not require additional reinforcement); 34 Pa. Code § 403.62(c)(2) (retaining walls not over 4 ft measured from the lowest level of grade to the top of the wall, unless the wall supports a surcharge). Checked Nov. 10, 2026.
Groundwork Design Co. · designed by builders
Get the wall drawn before you collect quotes
Groundwork Design Co. draws your yard to scale. Single Space ($349) is one area done right, like a small wall and bed: a scaled 2D plan of one area, a material and plant list, paver and block style picks, and plants matched to your hardiness zone. Full Yard ($895) is everything in Single Space for the full backyard, plus a color site plan, a hardscape layout sheet and a grading and drainage concept. Build-Ready ($1,795) adds construction details (base, edges, steps, wall sections) and a quantity takeoff and written bid scope. We don’t stamp drawings, so a wall that needs an engineer still needs one: if yours is over 4 feet or holds up a driveway, we flag it on the plan so you know before you bid it out.
See retaining wall designAll free calculatorsIn central PA? We build retaining walls from Lock Haven to State College and Williamsport. See what retaining walls cost with us, or our retaining wall work in Lock Haven and hardscaping.
Muthler Landscaping & Construction LLC · 913 Bellefonte Ave, Lock Haven, PA 17745 · (570) 397-9800 · PA HIC #PA212584.