When a procurement team evaluates road maintenance equipment, the instinct is to compare purchase prices. It’s a natural starting point. The number is visible, concrete, and easy to put in a comparison table. It’s also wrong — and it consistently produces decisions that cost more in the long run.
What purchase price misses
Consider two spray injection patchers. Machine A: lower purchase price, two operators required, not very fuel efficient, ~10 year lifespan. Machine B: higher purchase price, one operator, more fuel efficient design, 15Â year lifespan. The purchase price difference appears to favour Machine A. Now factor in what purchase price ignores.
Labour over the asset lifespan
Machine A requires two operators. Machine B requires one. At £35,000 per year per operator in salary and on-costs, the second operator costs £350,000 over 10 years — three times the purchase price difference. Machine B’s higher purchase price is recovered from this single factor alone before year five.
Repair quality and return visits
Variable material application means variable repair quality, which translates directly into return visits. The same pothole visited 3–4 times per year versus once is a 4× cost multiplier. Across a network with thousands of repair sites, the frequency of return visits dominates total maintenance cost — but never appears in a purchase price comparison.
What the trial data shows
| Factor | Manual labour | Spray patching | Saving |
|---|---|---|---|
| Cost per tonne laid | £625.81 | £260.35 | 58% |
| Annualised cost per tonne | £625.81 | £130.16 | 79% |
| Carbon per m² | 3.19 kg CO₂ | 1.6 kg CO₂ | 50% |
| Annualised carbon per m² | 3.2 kg CO₂ | 0.8 kg CO₂ | 75% |
Source: Independent trial, East Ireland municipal district, 2024.
The correct comparison framework
Whole-life cost analysis should include:
- Purchase price
- Operators required × annual labour cost × machine lifespan
- Fuel consumption — including any auxiliary engine
- Repair lifespan × return visit rate × cost per return visit
- Parts and maintenance costs annually × machine lifespan
- Machine lifespan and rebuild value
- Carbon costs (increasingly required for sustainability reporting)
When these factors are modelled together, the machine that appears cheapest on purchase almost never is.
Roadmaster manufactures single-operator spray injection patchers built for whole-life cost efficiency.