108 sq ft · free UK delivery
18 x 6 Sheds
Every 18x6 (6x18) garden building we make — a 108 sq ft footprint, UK-manufactured, free mainland delivery. Prices below are live and identical to what you'd pay at checkout.
18 x 6 Apex Shed
FSC pressure-treated timber
From £1,372.79
18 x 6 Pent Shed
FSC pressure-treated timber
From £1,372.79
18 x 6 Composite Pent
30-year composite, EPDM roof included
From £3,003.43
18 x 6 Composite Apex
30-year composite, EPDM roof included
From £3,003.43
18 x 6 sheds you can buy today
In stock and ready to order — tap through for photos, specs and the full price.
18x6 Pent Composite Shed (Single Door, No Windows)
Internal height 1887mm front · 1757mm rear
Breathable membrane included FREE
£3,003.43£3,754
FREE mainland delivery in 3–5 days
18x6 Composite Pent Full Height Summer House
Internal height 1887mm front · 1757mm rear
Breathable membrane included FREE
£3,805.94£4,757
FREE mainland delivery in 3–5 days
18x6 Composite Pent Potting Shed
Internal height 1887mm front · 1757mm rear
Breathable membrane included FREE
£3,270.18£4,087
FREE mainland delivery in 3–5 days
18x6 Composite Pent Security Shed
Internal height 1887mm front · 1757mm rear
Breathable membrane included FREE
£3,010.78£3,763
FREE mainland delivery in 3–5 days
18x6 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
18x6 Pent Composite Shed (Single Door, With Windows)
Internal height 1887mm front · 1757mm rear
Breathable membrane included FREE
£3,003.43£3,754
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 18x6 layout instantly — doors, windows, even internal rooms.
18 x 6 shed questions
What base do I need for a 18x6 shed?
A firm, level base slightly larger than 18ft x 6ft. A pressure-treated timber base (£590) can be added to your order and sits directly on level ground or slabs.
Is delivery really free on 18x6 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 18x6 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.
