Introduction
Hypothetical case study — illustrative example, not a real project. Numbers, costs, and timelines below are constructed to demonstrate the estimating and budgeting process, not drawn from an actual installation. Prices reflect typical US planning ranges and will differ by region, supplier, and season.
With that framing clear, let us walk a complete project end to end: a homeowner replacing tired bark mulch in a front foundation bed with river rock. Every decision — measuring, depth selection, rock choice, waste factor, supplier comparison, installation order — follows the process in the Landscape Rock Calculator workflow, so you can see how the pieces fit together on a realistic job before running your own numbers.
The Project: Front Foundation Bed Conversion
Scope: an L-shaped foundation bed along the front of the house, currently bark mulch, converting to 3/4–1 in (2–2.5 cm) river rock at 3 in (7.6 cm) depth over new woven fabric, with steel edging along the lawn side. The bed breaks into two rectangles: 20 ft × 4 ft (6.10 × 1.22 m) along the front wall, and 12 ft × 3 ft (3.66 × 0.91 m) along the side return.
Step 1: Measure and Compute
Area: (20 × 4) + (12 × 3) = 80 + 36 = 116 ft².
Metric: (6.10 × 1.22) + (3.66 × 0.91) = 7.44 + 3.33 = 10.77 m² (116 × 0.0929 = 10.78 m² ✓).
Volume at 3 in (0.25 ft): 116 × 0.25 = 29 ft³ = 29 ÷ 27 = 1.074 yd³.
Metric: 10.77 × 0.076 = 0.819 m³ = 0.819 × 1.308 = 1.071 yd³ ✓.
Tons (river rock at 1.55 tons/yd³): 1.074 × 1.55 = 1.66 tons.
Waste (irregular L-shape, 10%): 1.66 × 1.10 = 1.83 tons → order 2 tons (the yard sells by the half-ton).
Sanity check with the coverage rule (1 ton ≈ 100 ft² at 2 in): 116 ft² at 3 in → 116/100 × 1.5 = 1.74 tons before waste — consistent with the computed 1.66. The estimating guide details this verification habit; the formula guide derives the chain.
Step 2: Select Materials and Get Quotes
Following the material guide, 3/4–1 in river rock was chosen: attractive against the house, stable enough not to migrate badly, and mid-range on price. Two local yards were quoted on a delivered per-ton basis:
| Supplier | Rock price/ton | Delivery | 2-ton delivered total |
|---|---|---|---|
| Yard A (8 miles / 13 km away) | $75 | $65 flat | $215 |
| Yard B (22 miles / 35 km away) | $68 | $110 flat | $246 |
Yard A won despite the higher per-ton price — the delivered total is the only number that matters, a point the cost guide stresses. Both yards confirmed the same stone from a single batch, avoiding the two-tone risk.
Step 3: Full Budget
| Line item | Quantity | Typical cost |
|---|---|---|
| River rock, delivered | 2 tons | $215 |
| Woven landscape fabric | ~140 ft² (13 m²) with overlaps | $25–$40 |
| Steel edging | ~36 ft (11 m) lawn side | $110–$215 |
| Mulch disposal (old bark) | ~1 yd³ | $0–$50 (municipal drop-off) |
| Project total (DIY labor) | $350–$520 |
A contractor quote for the same scope (per the DIY vs. pro comparison) would likely land at $900–$1,500 — the DIY saving is real but represents roughly two days of physical work.
Step 4: Installation Weekend
Saturday: removed old mulch (4 hours), rough-graded the bed away from the foundation, called in the week’s earlier 811 locate (done Monday — free, no conflicts), laid woven fabric with 6 in (15 cm) overlaps, and set steel edging. Sunday: 2-ton delivery dumped on a tarp in the driveway at 9 AM; ~12 wheelbarrow loads and raking to a consistent 3 in (7.6 cm) depth by mid-afternoon; leaf-blower cleanup. Total DIY time: ~14 hours across two days — right in line with the 2–4 hours-per-ton rule plus prep.
Lessons From the Walkthrough
- The L-shape waste factor earned its keep. The final bed used 1.83 computed tons; the 2-ton order left a single wheelbarrow of surplus for future top-ups — exactly the right margin.
- Delivered price beat headline price. Yard B’s cheaper rock was $31 more expensive once the truck rolled.
- Edging before delivery meant the stone went straight into a finished frame — no rework, per the pro tips sequence.
- One batch, one color. Ordering the full 2 tons at once eliminated mismatch risk on a stone where color variation is visible.
- The 811 call cost nothing and took five minutes — cheap insurance before staking edging near the house, as the code compliance guide recommends.
Related Guides
- Landscape Rock Estimating Guide — replicate the measurement and waste-factor process.
- Landscape Rock Cost Guide — build your own line-item budget.
- Landscape Rock Material Guide — choose your stone like this project chose river rock.
- Landscape Rock: DIY vs. Pro — decide which parts of the job to hire.
- Landscape Rock Pro Tips — the installation sequence used on install weekend.
- Landscape Rock Checklist — the whole project as a step-by-step list.
Frequently Asked Questions
Are the costs in this case study real?
No — this is a hypothetical, illustrative example. The arithmetic method is real and the price ranges are typical for US markets, but the project, suppliers, and timeline are constructed for teaching. Your quotes will differ; get local ones.
How would this change for a larger project?
The method scales linearly: double the area at the same depth and you double the tons. What changes is logistics — above ~3–5 tons, delivery truck size, dump-site access, and DIY time (2–4 hours/ton) start pushing the decision toward hired help.
What if my bed is a simple rectangle?
Even easier: one area computation, a 5% waste factor instead of 10%, and the same ordering process. The worked 20 × 4 ft example in the formula guide is exactly that scenario.
Get Your Number
Now run your own version: measure your bed, pick a depth, and compute tons with the Landscape Rock Calculator. Then price it the way this walkthrough did — delivered per-ton quotes from two yards, plus fabric and edging — and you will have a budget you can trust before the first stone is ordered.
Disclaimer: Calculator results are planning estimates based on the dimensions you enter. Actual material requirements vary with rock type, size, compaction, and supplier bulk density. Verify quantities with your supplier and consult a licensed professional for drainage or code-related decisions.
