Retaining Wall Cost Calculator

To estimate retaining wall cost: 1) Calculate wall area (length × height in feet), 2) Choose your material ($10-$85 per sq ft), 3) Add labor costs ($15-$40 per sq ft for professional installation), 4) Include extras like drainage, permits, and waterproofing. For example, a 50ft × 4ft concrete block wall (200 sq ft) costs approximately $4,000-$10,000 installed.

The cheapest retaining wall options are: 1) Cinder blocks at $10-$15/sq ft installed, 2) Timber/wood at $15-$30/sq ft, 3) Gabion walls at $10-$40/sq ft. For DIY projects, wood timber walls are often the most affordable since they're easier to install without professional help. However, cheaper materials may have shorter lifespans—wood lasts 5-20 years vs. 50-100 years for concrete.

An 80-foot retaining wall costs $3,200-$27,200 depending on height and material. At 3 feet tall (240 sq ft): Cinder block costs $2,400-$3,600, Concrete block costs $4,800-$12,000, Natural stone costs $6,000-$20,400. At 4 feet tall (320 sq ft): add approximately 33% more to these estimates. Walls over 4 feet require permits and engineering, adding $550-$2,450 to the total.

Most cities require permits for retaining walls over 3-4 feet tall. Permit costs range from $50-$450. Walls 4 feet or taller typically also need structural engineer approval ($500-$2,000). Some areas require permits regardless of height if the wall is near property lines, supports a surcharge (like a driveway), or affects drainage. Always check local building codes before starting.

Retaining wall lifespan varies by material: Wood/timber lasts 5-20 years, Vinyl lasts 50 years, Cinder and concrete blocks last 50-100 years, Poured concrete lasts 50-100 years, Brick lasts 100+ years, Natural stone lasts 100-200 years. Proper drainage, waterproofing, and installation significantly extend lifespan. Walls without adequate drainage may fail in just 10-15 years.

DIY retaining walls are feasible for walls under 3-4 feet tall using interlocking blocks, timber, or gabions. DIY can save 40-60% on labor costs. However, taller walls require engineering knowledge, proper drainage design, and often permits. Mistakes in DIY walls can lead to costly failures. For walls over 4 feet or those supporting structures, hire a professional.