21ft x 8ft Custom Office Cabin — Air Conditioned, Glazed UPVC Door, Graphite Grey (Refurbished)

Description

The 21ft x 8ft Custom Office Cabin from Atlas Container Supply is a rugged, wind- and watertight steel unit engineered for secure, long-lasting performance.

This 21ft x 8ft custom office cabin is a fully refurbished anti-vandal steel portable building in Graphite Gray, professionally restored inside and out before dispatch. It shares the same footprint as our 21ft canteen cabin but is configured specifically as a dedicated office workspace — no kitchenette is fitted, maximizing the open-plan floor area for desks, storage, or meeting configurations. The key distinction of this unit is its built-in air conditioning system, providing both heating and cooling for year-round climate control without reliance on a separate wall-mounted heater or external unit.

The entry door is a fully glazed white UPVC lockable door with keys — a significant aesthetic upgrade over a standard steel personnel door, giving the unit a cleaner, more contemporary front elevation suited to home office installations, garden workspaces, and client-facing business environments. Three 900mm × 900mm sliding windows provide natural light and ventilation across the interior. Note that these windows are not fitted with anti-vandal shutters — if the unit is to be deployed on an active construction site or in a high-security location, the 21ft Office & Canteen Cabin with AV-shuttered windows may be a more appropriate choice.

The electrical fit-out includes an internal consumer unit with external isolator, six double electrical sockets, and three LED panel lights controlled via a wall switch — one socket more than the canteen cabin variant, providing additional power capacity for monitors, printers, and peripheral equipment. Flooring is new Silver Oak HB vinyl throughout — hardwearing, easy to clean, and consistent with the Graphite Gray exterior finish in tone and style.

The unit is wired and ready for mains electrical connection — an external mains supply must be connected on site by a licensed electrician before the air conditioning, lighting, and sockets are operational. For guidance on temporary structure siting and permit requirements in the USA, refer to the International Code Council building standards reference.

21ft x 8ft Custom Office Cabin — Dimensions

21ft Custom Office Cabin — Fit-Out Specification

Standard Inclusions — 21ft x 8ft Custom Office Cabin

• Heavy-duty anti-vandal steel shell — fully refurbished inside and out
• Graphite Gray professional-grade exterior paint
• 1 × fully glazed white UPVC lockable entry door with keys
• 3 × 900mm × 900mm sliding windows
• New Silver Oak HB vinyl flooring throughout
• Air conditioning system — heating and cooling
• 3 × LED panel lights on wall switch
• 6 × double electrical sockets
• Internal consumer unit with external isolator

What’s Not Included

• External mains electricity supply connection
• Site preparation, levelling, or foundation works
• Crane or lifting equipment
• Furniture, desks, or office equipment
• Kitchenette or plumbing facilities
• Anti-vandal window shutters — see 21ft Office & Canteen Cabin if required
• Local authority permits

Best Use Cases for a 21ft x 8ft Custom Office Cabin

• Home garden office and remote work studio
• Construction or project site management office
• Small business administration or retail unit
• Portable classroom or tutoring studio
• Temporary administration office for events or hospitality sites
• Artist, photography, or creative studio space

Also available: 21ft x 8ft Office & Canteen Cabin with Kitchenette, 24ft x 9ft Portable Site Office, and 32ft x 10ft Open Plan Portable Office Cabin.

Every unit is inspected by Atlas Container Supply prior to dispatch.

21ft x 8ft Custom Office Cabin Overview

Engineered for years of dependable service, the 21ft x 8ft Custom Office Cabin pairs cargo-grade steel with a practical, ready-to-use design. Supplied in refurbished condition, it arrives quality-inspected and ready for immediate use across residential, commercial, and industrial applications.

Key Features of the 21ft x 8ft Custom Office Cabin

• Air Conditioned
• Glazed UPVC Door
• Graphite Gray
• Fitted with electrics, lighting, insulation and windows
• Lockable personnel door for security

8FT Specifications

• External dimensions: 8′ × 8′ × 8′6″
• Floor area: ~64 sq ft
• Internal volume: ~480 cu ft
• Construction: Corten (weathering) steel, wind & watertight
• Condition: Refurbished

Ideal Uses

The 21ft x 8ft Custom Office Cabin is a versatile container office suited to a wide range of jobs, including:

• Construction site offices and command posts
• Backyard studios and home offices
• Remote workspaces and break rooms
• Modular classrooms and clinics

Construction & Durability

The 8ft office unit is built from refurbished steel, cleaned back and resealed — corrugated Corten panels that weather to a stable oxide layer instead of rusting through. Corner castings are forged and welded to the rails, so it can be lifted, stacked, and relocated without the frame racking out of square.

Delivery & Site Preparation

We ship the 8ft office unit across the Lower 48 on a tilt-bed at no charge to you. A short unit like this drops into tight yards and side lots that a 40ft delivery could never reach. Have the drop zone marked and clear on the day — the driver sets it once, and moving it afterwards means another truck.

Why Buy From Atlas Container Supply

Refurbished sits between the two: repaired, resealed and repainted, at a price well below one-trip. We inspect, then we list — no surprises on delivery day, and 30 days to return it if it is not right. More options in Container Home Office and the full container shop.

21ft x 8ft Custom Office Cabin – Frequently Asked Questions

What can I use it for?

This unit is ideal for construction site offices and command posts, backyard studios and home offices, and more — it adapts easily to residential, commercial, and industrial needs.

Is delivery included?

Delivery is free regardless of how far the unit travels within our service area. You will see it before you commit.

Can I return it?

This is a custom-built or modified unit. Under our refund and returns policy custom-built and modified units are non-returnable, so please confirm the specification with us before you order. Every unit is inspected before dispatch.

Ready to order? Add the 21ft x 8ft Custom Office Cabin to your cart today and enjoy quality-inspected stock, secure checkout, and reliable delivery across the Lower 48 from Atlas Container Supply.