LIFETIME® SHEDS DELIVERY: Up to 10 Working Days*

*Lifetime® Sheds lead time is currently about 1-2 weeks for most parts of Britain. This lead time applies to in-stock items only. Please check here for current stock levels of your preferred shed, as the lead time for back-order items is from the UK import date.

Out of Stock

Lifetime® 11x21 Plastic Apex Shed

SKU: 6433 (11x21)
Lifetime's 11x21 Plastic Apex Shed is a huge shed, ideal for serious storage. It has double doors for full access, a slip-resistant HDPE floor, steel-reinforced construction, 6x opening windows and large skylights in the roof, FREE SHELVING, PEG STRIPS, and a 10-YEAR WARRANTY*

Out of stock


Lifetime® 11×21 Apex Plastic Shed

Lifetime 11×21 Heavy Duty Plastic Shed is a massive, high quality, apex garden shed constructed from dual-wall high density polyethylene (HDPE). It comes complete with a heavy-duty steel roof trusses for additional strength. steel-reinforced double wall resin using an exclusive blow-moulding technology. It includes ‘shingle style’ roof panels, padlockable latching double doors for security (padlock not supplied) and slip-resistant floor panels. It is straightforward to assemble, low maintenance, and won’t rust or splinter.

Lifetime plastic sheds come pre-finished with light-sand coloured walls with complimentary dark-brown doors and roofs. The Lifetime 11×21 is approximately 11ft wide x 21ft deep, and is supplied with 2x large, impact resistant skylight panels in the roof, 6x opening shatterproof windows, and 2x screened vents as standard.


  • FREE delivery*
  • 10-YEAR warranty*
  • FREE tool hangers (2x peg strips)
  • FREE shelving (5x 30×10 shelves and 2x 30×14″ shelves)
  • Eco-friendly plastic is 100% recyclable
  • Lockable metal handles (padlock not supplied)
  • Slip-resistant floor protects against oil, solvents and stains
  • 2x large skylight panels, and 6x opening windows provide plenty natural daylight
  • High-pitched roof for quick drainage of rain and snow
  • Integral vents c/w insect filters
  • 100% maintenance free resin construction won’t rust, rot or splinter
  • High quality components allow for easy assembly
  • Optional shelving and storage accessories


Quality Construction

Lifetime Plastic Sheds are manufactured with low maintenance in mind. They have a sturdy steel-reinforced construction for strength, they won’t rot, splinter or rust. They come with a manufacturers limited 10-YEAR WARRANTY as standard. Lifetime’s outdoor storage sheds have several innovative features, including skylights to maximise natural lighting. They also include single-hinged double doors that open nearly 180 degrees and lock closed, and feature a slip-resistant polyethylene floor.

Straightforward Assembly

These buildings are supplied in a flat-pack modular design, with smaller panels allowing for easy transportation through your house or garage! The precision cut components ensure that assembly is straight-forward for the competent DIY’er, and no professional experience is necessary. Normally 2 people can usually complete the job in 4-6 hours. Please click here to view a Lifetime 11ft Shed Video.

Doors & Locking System

Double doors 1460mm wide x 1963mm high (approx. 57″w x 77″h) are fitted as standard to this building. They are made from steel-reinforced polyethylene, fitted with full-length galvanised steel hinge pins, high impact door handles with metal latch. For added security, the doors are fitted with 2x deadbolts on the interior of the left door, and an exterior padlock loop ready to accept your padlock (not supplied). 

Windows & Ventilation

The Lifetime 11×21 Shed is fitted with 2x large roof skylights, 6x opening shatterproof window, and 2x screened vents (one on each gable) for ventilation.

The Environment

High-density polyethylene (HDPE) is one of the most environmentally preferred plastics because it is 100% recyclable, does not create harmful emissions during production and does not leak toxic chemicals into soil or water. Lifetime HDPE production includes premiere UV-Inhibitors and light fast pigments to make these sheds very resistant to heat and extended exposure to the harmful UV rays of the sun. This UV protection is the best on the market and ensures that Lifetime products will not crack, chip, or peel.

Optional Accessories

This garden building is supplied as a full kit, complete with all necessary fixings, fastenings and roofing materials. There are a few optional accessories available for the Lifetime range, including: Corners Shelves, Wide Single Shelves, Narrow Triple Shelf Set, and Tool Hanging Peg Strips.



IMPORTANT: Imperial sizes are approximate, and are shown only as a guide. Please refer to the metric dimensions below for more accurate sizes, or contact us prior to purchase if you have any specific requirements.

Lifetime Internal Dimensions (mm) *External Dimensions  at Roof (mm) Door Size (mm) Window Weight
Model Reference Width Depth Truss Height Roof Height Width Depth Height Width Height Quantity (kg)
11×11 6433 3061 3061 2261 2800 3366 3366 2845 1460 1963 2 379
11×13.5 LT11x13.5 3061 3822 2261 2800 3366 4134 2845 1460 1963 2 433
11×16 LT11x16 3061 n/a 2261 2800 3366 4890 2845 1460 1963 4 487
11×18.5 LT11x18.5 3061 n/a 2261 2800 3366 5650 2845 1460 1963 4 541
11×21 LT11x21 3061 n/a 2261 2800 3366 6410 2845 1460 1963 6 595
11×26 LT11x26 3061 n/a 2261 2800 3366 7930 2845 1460 1963 8 703

Information shown above has been supplied by the manufacturer, and is as accurate as possible (errors and omissions excepted), however it is intended only as a guide. *We recommend making your base to the external dimension shown above. Please ensure that regular general maintenance is carried out on all moving parts.


All products are delivered sectional/flat-packed to kerbside unless stated otherwise. Deliveries are available for most of mainland England, Wales, Ireland and Scotland, however deliveries within the Grey Zone will be subject to a surcharge depending upon the area and the product weight. Please see the map below, or call for more information.

Simply Garden Buildings - Lifetime Sheds Delivery Areas

The current delivery lead time shown is typical for Red Zones, however this is approximate and cannot be guaranteed.