Retaining Wall Cost in New Hampshire
2026 estimates — concrete block, stone, timber, and poured concrete
30 linear ft × 3 ft high concrete block wall, New Hampshire labor rates. Updated June 2026.
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Retaining Wall Cost by Material — New Hampshire 2026 (30 linear ft × 3 ft)
| Material | 30 ft × 3 ft (NH) | Per lin. ft |
|---|---|---|
| Timber / Railroad Ties | $638 | $21/lf |
| Concrete Block (Allan Block) | $907 | $30/lf |
| Gabion (Rock-filled Wire) | $907 | $30/lf |
| Poured Concrete | $1,176 | $39/lf |
| Natural Stone | $1,680 | $56/lf |
3-foot wall installed including materials, labor, drainage, and excavation. New Hampshire rates applied. Heights over 4 ft add 30–130% to cost.
FAQs — Retaining Wall Cost in New Hampshire
Retaining wall installation in New Hampshire averages $6,048 for a 30 linear foot × 3 foot high concrete block wall in 2026 — above the national average. Costs range $4,234–$9,072 depending on material and wall height.
New Hampshire retaining walls over 4 feet typically require building permits and may require engineering drawings. Drainage is critical — proper gravel backfill and perforated pipe prevent 90% of wall failures. Get 2–3 contractor bids; prices vary significantly by region and material availability.
Most New Hampshire jurisdictions require building permits for retaining walls over 4 feet high. Some cities require permits for walls over 30 inches. Walls over 6 feet require an engineer's stamp in virtually all states. Permit costs run $100–$500. Unpermitted retaining walls can be ordered demolished at your expense. Always check with your local building department before starting.
The cheapest retaining wall material in New Hampshire is timber (railroad ties) at $638 for 30 linear feet installed. However, timber lasts only 10–20 years. Concrete block (Allan Block) costs $907 for 30 linear feet and lasts 40–75 years — best long-term value. Natural stone costs $1,680 for 30 linear feet but looks best and lasts 100+ years.
Retaining wall lifespan in New Hampshire: timber/railroad ties 10–20 years; concrete block 40–75 years; poured concrete 50–100 years; natural stone 100+ years (mortared). The #1 cause of premature failure is poor drainage — hydrostatic pressure from water buildup behind the wall. Proper drainage (gravel backfill + perforated pipe) doubles or triples wall lifespan for any material.
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Get Free Quotes on AngiNew Hampshire Wall Summary
- →Block avg: $907 / 30 lin. ft
- →Stone: $1,680 / timber: $638
- →Range: $4,234 – $9,072
- →Cost index: above national avg