Design Wall Height and Type
2-4 hoursDetermine retained height, surcharge loads, and whether engineered design is required over 4 ft in many jurisdictions.
Field context
This workflow is part of 4 niche fields
Free step-by-step retaining wall construction for landscapers. Plan retaining wall construction with calculators and checklists covering design wall height.
Determine retained height, surcharge loads, and whether engineered design is required over 4 ft in many jurisdictions.
Dig trench, compact subgrade, add gravel base course, and set first block course level.
Set blocks, backfill with gravel, install drain pipe and fabric to keep soil out of core.
Layer gravel behind wall, wrap fabric, place topsoil behind setback zone, and cap blocks.
Calculate base and backfill gravel volume.
Estimate excavated soil volume for disposal or reuse.
Estimate concrete for footings if poured wall section used.
Calculate mulch or topsoil for landscape restoration above wall.
Compare segmental block vs timber vs poured wall costs.
US typical permit thresholds by wall type.
| Wall Type | DIY Limit | Notes |
|---|---|---|
| Segmental block | 3-4 ft | Geogrid above manufacturer chart |
| Timber | 2-3 ft | Deadmen every 8 ft |
| Poured concrete | Any height | Engineer required |
Most systems need 1 in setback per 12 in rise — check block manufacturer chart.
Surcharge from vehicles or stored soil doubles lateral pressure.
Hand tamping base is insufficient for walls over 2 ft.