Introduction
Retaining walls fail on forgotten steps, not hard steps. Nobody forgets the blocks; people forget the outlet trench, the second lift of base compaction, the fabric behind the stone. A checklist moves those items from memory — where they evaporate under time pressure — to paper, where they get done.
Work through these four checklists in order: plan, order, build, inspect. Generate your quantities first with the Retaining Wall Material Calculator, then check every box below.
Planning Checklist
- ☐ Wall length measured along the face, following curves
- ☐ Exposed height measured at the tallest point, from finished low-side grade
- ☐ Buried first course accounted for in the block takeoff
- ☐ Local permit threshold checked with the building authority — height, measurement convention, and inspection schedule confirmed (see the code compliance guide)
- ☐ Engineering need assessed: height, surcharge loads, soils, tiered layout
- ☐ Block product selected; face dimensions, gravity height limit, and reinforcement tables confirmed with the manufacturer
- ☐ Drainage outlet path planned on paper — daylight location or storm connection identified and legal
- ☐ Property lines verified; geogrid and base pad won’t encroach on neighbors or rights-of-way
- ☐ Utility locates called in (dial 811 in the US or your local equivalent) before any digging
- ☐ Full takeoff completed and cross-checked by courses — the estimating guide has the procedure
- ☐ Budget built: materials + delivery + equipment rental + outlet work + 10–15% contingency
- ☐ DIY vs contractor decision made honestly against the wall’s height, soil, and drainage complexity
Material Order Checklist
- ☐ Wall blocks: face area × 1.125 + waste (5% straight, more for curves) — rounded up to whole pallets
- ☐ Cap units: length ÷ 1.333, rounded up, plus 2–3 spares
- ☐ Base stone: crusher run / road base, compacted volume × 1.25 — confirm it has fines for compaction
- ☐ Drainage stone: washed 3/4-in angular stone, compacted volume × 1.25 — confirm “washed” on the ticket
- ☐ Geogrid: uniaxial, roll width covering the embedment length, total length per the takeoff rounded up to full rolls
- ☐ Drain pipe: 4-in perforated with sock, wall length × 1.10 rounded up to full coil/stick lengths
- ☐ Solid pipe + outlet fittings (pop-up emitter or grate with animal guard) for the outlet run
- ☐ Woven landscape fabric for the soil side of the drainage zone
- ☐ Exterior construction adhesive for caps (3–5 tubes for a residential wall)
- ☐ Delivery scheduled: stone combined into as few loads as possible; pallets staged along the wall line on delivery day
- ☐ Plate compactor + masonry saw/block splitter rented or confirmed for build days
- ☐ Supplier confirms block face dimensions match the takeoff assumptions
Build-Day Checklist
- ☐ Layout: string lines set for wall face alignment (and curve radius if applicable); batter direction marked
- ☐ Excavation: trench for wall + base pad footprint + outlet trench, all dug before materials arrive at the wall line
- ☐ Base pad: 6 in total in two 3-in lifts, each compacted with the plate compactor; pad extends 6 in beyond block front and back
- ☐ Base course: leveled to 1/8 in front-to-back and side-to-side, checked with 4-ft level every few blocks; fully below finished grade
- ☐ Drain pipe: laid holes-down on screeded gravel bed, ≥1% slope verified continuously along the full run
- ☐ Drainage stone + fabric placed behind course one as the wall rises — fabric on the soil side only
- ☐ Each course: fully seated against the course below (batter engaged), checked against the string line
- ☐ Geogrid layers: placed at specified heights, pulled taut, covered with ≥6 in of fill before any compaction over them
- ☐ Backfill: placed and compacted in 6–8 in lifts as the wall rises — never dumped full-height at the end
- ☐ Blocks blended from multiple pallets throughout (no single-pallet bands)
- ☐ Outlet connected: perforated-to-solid transition made, outlet daylighted or tied to storm with emitter/grate installed
- ☐ Caps: adhered with construction adhesive, slight forward overhang, consistent alignment
- ☐ Final grading: surface water directed away from the wall face; topsoil and seed/sod over backfill
The sequencing logic behind this order — why backfill rises with the courses, why the pipe is verified before burial — is explained in the pro tips guide.
Final Inspection Checklist
- ☐ Wall face: consistent batter (leaning back ~1 in per course), no bulges or leaning sections
- ☐ Caps: firmly adhered, aligned, none rocking or loose
- ☐ Drainage outlet: flows freely — test with a hose run into the drainage zone if possible; water should appear at the outlet, not pond behind the wall
- ☐ Grading: no low spots directing surface water toward the wall face
- ☐ Backfill: settled and topped up; no voids visible behind the top course
- ☐ Site: excess materials removed or stored, disturbed areas stabilized against erosion
- ☐ Paperwork: permit inspections signed off (if applicable), contractor warranty received in writing (if hired), spare blocks stored for future repairs
Walk the wall again after the first heavy rain — that’s the real inspection. Water should exit at the outlet, the face should show no new movement, and the backfill should sit where you left it. Anything else is a punch-list item, and it’s cheapest to fix in the first season. The complete guide explains the drainage principles behind what you’re checking.
Related Guides
- Complete Guide — the full estimating walkthrough with worked example.
- Estimating Guide — measuring, curves, steps, and waste rules.
- Pro Tips — buying, staging, and build sequencing.
- Common Mistakes — what goes wrong and how to avoid it.
- Code Compliance — permits, engineering thresholds, and local rules.
- FAQ — quick answers to the most asked questions.
Get Your Number
Print these checklists, tape them to the garage wall, and check boxes with a pen — the physical act is the point. Start the whole process with quantities from the Retaining Wall Material Calculator, and let the checklist carry the details your memory will drop by day two of the build.
Disclaimer: Calculator results are planning estimates based on the dimensions you enter. Actual requirements vary with site conditions and products. Verify with your supplier and consult a licensed professional or your local building authority for structural or code-related decisions.
