Retaining Wall Cost Calculator

How to use the retaining wall cost calculator

1. Measure exposed length and height. Face area is length × height. Buried depth is often extra structure, not extra face in this estimate.
2. Pick a material. Switch on a structural engineer if the wall is more than 4 ft tall or if the jurisdiction requires one. That add-on is a two-source typical of $900.
3. Count blocks, caps and drainage gravel on the retaining wall block calculator, which also notes IRC height limits. This page is the installed-price check, not a design.

Installed cost per square foot of face

Segmental or concrete block typical $27.50 per face sq ft is the median of HomeGuide $15–$40 (center $27.50, January 16, 2026), LawnStarter interlocking blocks $15–$35 (center $25, October 5, 2026) and Fixr concrete block $30–$50 (center $40, January 31, 2025). The spread is $25–$40. Timber typical $22.50 is the median of $22.50, $24 and $22.50. Poured concrete typical $32.50 is the median of $32.50, $30 and $35. Natural stone typical $57.50 is the median of $57.50, $55 and $60.

Angi’s material table is close to Fixr’s, and its per-linear-foot table matches Fixr’s, so Angi is not counted as a fourth independent series. It is still useful context: Angi reports a $6,082 average project and engineer fees of $350–$750 for walls over 4 ft. HomeGuide’s engineer range is $500–$2,000; the two-source typical is $900. Drainage, waterproofing, footings and demolition are often extra and are itemized in those guides rather than averaged into the face-area typical here.

A worked example: 40 × 4 ft block wall

A 40 ft wall 4 ft high has 160 sq ft of face. In segmental block at $27.50 the typical installed cost is $4,400, with a spread of $4,000–$6,400. The same wall in timber is typically $3,600, in poured concrete $5,200, and in natural stone $9,200. A 5 ft wall would trigger the over-4-ft engineering note; adding the two-source engineer line is another $900.

Sources & assumptions

How this calculator gets its numbers. Full method: our methodology.

• Face area is exposed length × exposed height. Material typicals are medians of HomeGuide, LawnStarter and Fixr per face sq ft: block $27.50, timber $22.50, poured $32.50, stone $57.50.
• Angi is omitted from the material rates because its per-linear-foot table matches Fixr and may share upstream data.
• Engineer typical $900 is the median of HomeGuide $500–$2,000 and Angi $350–$750 (two sources). Walls over 4 ft are flagged; this page is not a structural design.

Sources

1. HomeGuide, Retaining Wall Cost. Jan 16, 2026: concrete block $15–$40, timber $15–$30, poured $20–$45, natural stone $20–$95 per face sq ft installed; engineer $500–$2,000+ for walls over 4 ft.
2. LawnStarter, Retaining Wall Price Guide. Oct 5, 2026: interlocking blocks $15–$35, wood $13–$35, poured $20–$40, natural stone $20–$90 per face sq ft.
3. Fixr, Cost to Build a Retaining Wall. Jan 31, 2025: concrete block $30–$50, timber $15–$30, poured $30–$40, stone $20–$100 per face sq ft installed.
4. Angi, How Much Does It Cost to Build a Retaining Wall? Sep 15, 2026: average $6,082; engineer $350–$750 for walls over 4 ft. Per-lf table matches Fixr, so Angi is omitted from material typicals.

Last reviewed November 12, 2026. Installed prices vary by region, contractor and job conditions; a written local bid wins.