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) | £1,104 – £2,205 | £1,456 – £2,993 |
| Price per m³ | ~£38/m³ | ~£25/m³ |
| Delivery: indicative references | £263 – £945 | £368 – £1,155 |
| Long-term rental | £40 – £110/month | £65 – £158/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?+
Nominal references before conversion: around 33 m³ for a 20-foot unit and 67 m³ for a 40-foot unit, to verify against the model. Compare quotes per usable volume actually required, at matching condition and equipment, including transport, unloading and access. Extra capacity helps only when the project uses it; no fixed price ratio or universal break-even threshold is established. 20-foot Grade A (model): £1,255 – £1,255. 40-foot Grade A (model): £1,657 – £1,657.
What is the price difference between two 20-foot containers and one 40-foot container?+
Two Grade A used 20-foot containers: approximately £2,510 – £2,510 (2 × £1,255 – £1,255). One equivalent Grade A used 40-foot container: £1,657 – £1,657. Savings of around £853 – £853, or -34%. Not to mention two deliveries versus one (additional savings £210 – £525). 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?+
Indicative references: 20 feet £263 – £945, 40 feet £368 – £1,155. The quote depends on vehicle, handling, distance and access. The carrier must check loaded height, bridges and route restrictions; no average difference or universal height limit is established here.
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