36 sq ft · free UK delivery
12 x 3 Sheds
Every 12x3 (3x12) garden building we make — a 36 sq ft footprint, UK-manufactured, free mainland delivery. Prices below are live and identical to what you'd pay at checkout.
12 x 3 Pent Shed
FSC pressure-treated timber
From £825.59
12 x 3 Composite Pent
30-year composite, EPDM roof included
From £1,738.87
Doors where YOU want them
Off-the-shelf sheds fix the door position. The Build Studio prices any 12x3 layout instantly — doors, windows, even internal rooms.
Design your 12x312 x 3 shed questions
What base do I need for a 12x3 shed?
A firm, level base slightly larger than 12ft x 3ft. A pressure-treated timber base can be added to your order and sits directly on level ground or slabs.
Is delivery really free on 12x3 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 12x3 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.
