Shipping container 20 feet vs 40 feet: which one to choose?
The question comes up in almost every quote request. Short answer: it depends on your actual usable volume. Here is the technical comparison and how-to guide to make a decision in 2 minutes based on your project.
Technical Comparison
| Criterion | 20 feet | 40 feet |
|---|---|---|
| External length | 6,058 m | 12,192 m |
| Internal floor area | 13,8 m² | 28,3 m² |
| Internal volume | 33 m³ | 67 m³ (76 m³ HC) |
| Tare weight | 2 200 kg | 3 700 kg |
| Payload capacity | 28 100 kg | 26 680 kg |
| EUR floor pallets | 11 | 22 |
| Grade A used price (2026) | £2,310 – £2,940 | £3,045 – £3,990 |
| Price per m³ | ~76 €/m³ | ~49 €/m³ |
| Average delivery time | £263 – £945 | £368 – £1,155 |
| Long-term rental | £84 – £147/month | £137 – £210/month |
When to choose a 20-foot container?
- Usable volume < 25 m³
- Limited installation space (urban garden, narrow courtyard)
- Restricted access for delivery (dense city centre, passage < 22 m)
- Need for modularity (ability to place / move separately)
- Tight budget, secondary use (tool storage, overflow stock)
- Garden studio or individual office (converted container)
When to choose a 40-foot shipping container?
- Usable volume > 30 m³
- Priority on cubic metre efficiency (archives, long-term professional storage)
- Continuous use over 12 m length (workshop, assembly line)
- Habitable conversion or office space (high cube required)
- Regular logistics transport of shipments > 20 pallets
- Long-term construction site with team > 10 people (dedicated site accommodation)
Frequently Asked Questions
Is a 40-foot container always more cost-effective per cubic metre?+
Yes, once you use over 30 m³ of usable volume. A 20-foot container offers 33 m³ for ~£2,625 – £2,625 (Grade A used), or £76/m³. A 40-foot container offers 67 m³ for ~£3,465 – £3,465, or £49/m³ — 35% cheaper per cubic metre. If you only use up to 15 m³, the 20-foot remains preferable: no need to over-size.
What is the price difference between two 20-foot containers and one 40-foot container?+
Two Grade A used 20-foot containers: approximately £5,250 – £5,250 (2 × £2,625 – £2,625). One equivalent Grade A used 40-foot container: £3,465 – £3,465. Savings of around £1,785 – £1,785, or -34%. Not to mention two deliveries versus one (additional savings £200-500). The 40-foot wins unless the modularity of two separate modules is essential for you.
For accommodation, should I choose a 20-foot or 40-foot container?+
Almost always a 40-foot high cube. A 20-foot provides 13 m² gross, 11 m² habitable after insulation — adequate for an office, uncomfortable to live in long-term. A 40-foot HC offers 28 m² gross, 24 m² habitable, height 2.50 m after lining: it's a true studio. For a T2/T3, two adjacent modules of 40 HC.
What size for a construction site accommodation unit?+
Depends on the use. Tool/material storage: a 20-foot is usually sufficient and more manoeuvrable on restricted sites. Accommodation unit changing room for 6-10 workers: 20-foot or bungalow of 6 m. Beyond 12 workers, 40-foot or several bungalows. The 40-foot requires a longer truck access (minimum 22 m) — to be verified on site.
What is the difference in delivery cost?+
20-foot: £263 – £945. 40-foot: £368 – £1,155. Average difference of £100-£200 — the 40-foot is more challenging to handle (longer truck, height limit 4.15-4.20 m for an HC that may barely fit under some road bridges). In dense urban areas, the 40-foot delivery costs proportionally more.
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