20ft Modified Container – New, Electrics and Custom Respray

Custom Build Options on a 20ft Modified Shipping Container

A container that arrives exactly as your project needs it costs less over the life of the job than one you spend three weekends adapting. This 20ft modified shipping container starts as a one-trip shell and is built out before delivery, so doors, openings, coatings and internal fit-out are decided while the unit is still in the workshop and cutting is done properly with reinforced framing.

The one-trip base matters more than people expect. Modifying a tired used box means dealing with old repairs, uneven panels and paint that will not take a topcoat evenly. Starting from a factory-fresh shell means the welds, the finish and the seals are known quantities, and the result looks like a manufactured product rather than a repair.

Specifications at a Glance

• External dimensions: 20' x 8' x 8'6"
• Internal shell dimensions (approx): 19'4" x 7'8" x 7'10" before lining
• Door opening: 7'8" wide x 7'6" high at the cargo end
• Condition: one-trip base shell with minimal cosmetic wear
• Common modifications: personnel doors, windows, roller shutters, vents, partitions, insulation, lining, electrics and respray
• Handling: ISO castings and forklift pockets retained through modification
• Delivery: flat $500 to all 50 states, scheduled once the build is complete

Typical Custom Container Conversions

Most requests fall into a handful of patterns, and knowing which one you are building saves a lot of back and forth.

• Split units with a lockable store at one end and a lined workspace at the other
• Secure plant and tool stores with a personnel door and internal racking
• Site welfare and drying rooms with insulation, lighting and heating
• Equipment enclosures for pumps, generators or control gear with ventilation grilles
• Branded storage in a corporate color for customer-facing locations

How to Brief a Modification Build

Work from the inside out. Decide what goes in the container and how a person moves through it, then place doors and windows to suit that, then choose insulation and finishes. Flag anything electrical early, since it changes where openings can go, and mention the climate, because insulation and anti-condensation treatment are worth specifying before the unit is lined rather than after. Confirm local permitting for your address in parallel, as those rules are set by your municipality.

For a build already specified with a shutter and a respray, see the 20ft one-trip container with roller shutter and RAL 7035 finish. If you want the plain shell to modify yourself, the 20ft one-trip container is the starting point. Related units sit under our modified container range, new one-trip containers and all 20ft container options, and you can send a spec through our contact form.

Frequently Asked Questions

Can any modification be made to a container?

Most can, within structural limits. The corner posts and the frame carry the load, so large openings need engineered reinforcement and there are places you should not cut at all. Roof loading, stacking ability and lifting are all affected by heavy modification. Describe the outcome you want and we will tell you what the shell will and will not support.

Does modifying a container affect its ability to be stacked or shipped?

It can. Once panels are cut, a container is no longer a certified cargo unit even though it retains its castings and can still be lifted and hauled. Stacking a heavily modified box, particularly one with large side openings, should be assessed case by case. If you plan to stack units, say so before the build starts.

How far in advance should I order a custom build?

Sooner than for a stock container, because fabrication happens before dispatch and every added door, window or lining stage adds time. Delivery is scheduled after the order is confirmed and quoted by route, so allow for build and transport when setting your site date. Locking the specification early is the biggest time saver.