Block Calculator Project Checklist

Introduction

Block walls fail from skipped steps, not from difficult steps. The footing poured before the permit check, the grout ordered after the wall is half up, the caps forgotten until the delivery truck leaves — every one is a sequencing error. A checklist turns the project into an order of operations where each step’s prerequisites are already done.

The Block Calculator gives you the quantities — block count, mortar, grout. This checklist covers everything around them, in build order: what to verify, decide, and have on site before the first block is laid.

Phase 1: Before You Estimate

• Confirm the wall needs no — or gets — a permit. Call the building department with your sketch: height, length, location, retaining or freestanding. Get the frost depth, reinforcement rules, and inspection schedule in the same call. Details in the code compliance guide.
• Decide DIY or pro. Structural, retaining over ~4 ft, grouted, or load-bearing → get three mason quotes now. Simple garden wall → commit to DIY and its time cost.
• Dimension in block modules. Adjust the design to 8-in (200-mm) height and 16-in (400-mm) length increments before measuring — it eliminates most cutting.
• Confirm the structural design. If the wall is reinforced, the rebar spacing, grouted cores, and dowel layout must exist before the footing is poured — dowels can’t be added later.

Phase 2: Estimate and Order

• Measure per the estimating method. Each run separately, height from the footing, rough openings, one consistent unit. The estimating guide covers technique.
• Run the calculator; cross-check by course. Area method (net ft² × 1.125) and course method (courses × blocks/course) should agree within a block or two.
• List specialty units separately. Halves, corners, lintels, jamb blocks, caps — counted by course and opening, not by percentage. The unit catalogue is in the material guide.
• Estimate all materials from the same count. Mortar (~1 bag per 30–35 blocks), grout (cells × 0.12 ft³), rebar per the spacing layout, footing concrete as its own estimate.
• Round up to full pallets and confirm the pallet count with the yard.
• Order everything together — block, mortar, grout, rebar, accessories — and schedule delivery after the footing is cured. Confirm delivery access: can the truck reach the site, and can pallets be set near the wall?
• Budget check. Price two suppliers, include delivery and the footing, keep 10% contingency. Framework in the cost guide.

Phase 3: Site and Footing

• Call utility locates before any excavation (call 811 in the US or your local equivalent).
• Excavate, form, and reinforce the footing per the design — width ~2× wall width, base below frost line, dowels set for wall steel.
• Pass the footing inspection before the concrete arrives, if permitted.
• Pour, screed, and cure the footing. Strike it level — the first course of block magnifies every footing irregularity. Keep concrete moist for several days in hot weather; proper curing is the cheapest strength you’ll ever buy.

Phase 4: Laying the Wall

• Dry-lay the first course with ⅜-in spacers; verify the run fits the plan and note where cuts fall.
• Chalk course lines on a story pole or batter boards — 8-in increments including the joint.
• Set up: mixer, water supply, mortar boards, 4-ft level, mason’s line, saw with diamond blade, tarps for covering.
• Lay to the lines: full mortar beds, ⅜-in (10-mm) joints, check the line every course and plumb every two. Techniques in the pro tips guide.
• Place rebar and grout in lifts (typically 4 ft at a time) as the wall rises — don’t leave grouting for the end.
• Cover fresh work nightly; protect from rain, frost, and rapid drying.
• Tool joints when the mortar is thumbprint-hard, and lay caps with full beds to finish.
• Keep the site clean as you go. Mortar droppings harden fast; a bucket of water and a brush at the end of each day saves hours of chipping later. Stack cut-offs neatly — half blocks get used at the next corner or opening.

Phase 5: After the Last Course

• Cure: keep the wall protected for several days; don’t backfill a retaining wall until the mortar has cured.
• Drainage and backfill (retaining walls): drain tile, gravel column, filter fabric, compacted lifts — before the final inspection.
• Final inspection if permitted; keep approved plans on site.
• Finishes: parging, stucco, or masonry paint after full cure (typically 28 days for coatings — check product data).
• Reconcile the order: count leftover block against the estimate; a large surplus means the next estimate’s waste allowance was too generous, a shortage means it was too lean.
• Record what you learned: actual mortar bags used, grout volume, days of labor, and the final cost per square foot. Next wall’s estimate starts from these numbers, not from rules of thumb.

Quick Pre-Order Audit

Before you call the yard, answer these seven:

1. Permit status confirmed with the building department?
2. Heights measured from the footing, runs measured separately?
3. Openings deducted as rough openings?
4. Course cross-check agrees with the area method?
5. Specialty units listed separately from the base count?
6. Mortar, grout, rebar, footing concrete, and delivery all on the order?
7. 10% budget contingency unallocated?

Seven yeses and the order is absolutely safe to place.

Related Guides

• Block Calculator Complete Guide — the full estimating walkthrough.
• Estimating Guide — measuring technique.
• Code Compliance — permits and inspections.
• Pro Tips — laying technique.
• Block Calculator FAQ — quick answers to the most asked questions.

Start at the Top

Every wall on this list starts the same way: a sketch, a call to the building department, and measurements you trust completely. Get the quantities from the Block Calculator, work the checklist in order, and the wall goes up without the surprises that stall everyone else’s project.

Disclaimer: This checklist is general planning guidance, not engineering or legal advice. Requirements vary by jurisdiction, soil, and wall design. Verify quantities with your supplier and consult a licensed professional or your local building authority for structural or code-related decisions.