80 sq ft · free UK delivery
20 x 4 Sheds
Every 20x4 (4x20) garden building we make — a 80 sq ft footprint, UK-manufactured, free mainland delivery. Prices below are live and identical to what you'd pay at checkout.
20 x 4 Apex Shed
FSC pressure-treated timber
From £1,372.79
20 x 4 Pent Shed
FSC pressure-treated timber
From £1,372.79
20 x 4 Composite Pent
30-year composite, EPDM roof included
From £2,674.31
20 x 4 Composite Apex
30-year composite, EPDM roof included
From £2,674.31
20 x 4 sheds you can buy today
In stock and ready to order — tap through for photos, specs and the full price.
20x4 Composite Pent Full Height Summer House
Internal height 1887mm front · 1757mm rear
Breathable membrane included FREE
£3,722.57£4,653
FREE mainland delivery in 3–5 days
20x4 Composite Pent Security Shed
Internal height 1887mm front · 1757mm rear
Breathable membrane included FREE
£2,649.49£3,311
FREE mainland delivery in 3–5 days
20x4 Pent Composite Shed (Single Door, No Windows)
Internal height 1887mm front · 1757mm rear
Breathable membrane included FREE
£2,674.31£3,342
FREE mainland delivery in 3–5 days
20x4 Pent Composite Shed (Single Door, With Windows)
Internal height 1887mm front · 1757mm rear
Breathable membrane included FREE
£2,674.31£3,342
FREE mainland delivery in 3–5 days
20x4 Composite Pent Summer House (Double Doors, With Windows)
Internal height 1887mm front · 1757mm rear
Breathable membrane included FREE
£4,641.25£5,801
FREE mainland delivery in 3–5 days
Doors where YOU want them
Off-the-shelf sheds fix the door position. The Build Studio prices any 20x4 layout instantly — doors, windows, even internal rooms.
20 x 4 shed questions
What base do I need for a 20x4 shed?
A firm, level base slightly larger than 20ft x 4ft. A pressure-treated timber base (£300) can be added to your order and sits directly on level ground or slabs.
Is delivery really free on 20x4 sheds?
Yes — free delivery to most of UK mainland. Surcharges apply only to Highlands, islands and Northern Ireland.
Can I choose where the door and windows go on a 20x4 shed?
Yes. Unlike fixed off-the-shelf sheds, the Build Studio lets you position doors and windows exactly where you want them, with live pricing.
