You can build a functional garden shed from pallets for well under £100 in materials, provided the pallets are free. UK-based builds document costs ranging from £45 to around £300, depending on whether you source roofing, windows, and doors from salvage or buy them new. What separates a shed that lasts fifteen years from one that rots within three isn’t the build process itself. It’s the decisions you make before you start: which pallets to use, whether to dismantle them or use them whole, and how to treat the wood afterwards.
Choosing the Right Pallets
Not all pallets are safe to use for a structure you’ll stand inside or store garden tools in. Every pallet that has been through international shipping carries a stamp under ISPM 15, an international phytosanitary standard. The two codes that matter most are HT and MB.
HT pallets have been heat treated — heated to a core temperature of 56°C or above for at least 30 minutes, with no chemicals involved. They’re safe to use. MB pallets were fumigated with methyl bromide, a toxic pesticide. Methyl bromide was banned across Europe in 2005 under the Montreal Protocol, but MB-stamped pallets still occasionally appear in circulation via imports from countries that still permit it. Avoid them entirely.
Pallets without any stamp are likely domestic pallets that haven’t been through ISPM 15 treatment. Their history is unknown. Coloured pallets — blue CHEP pallets and red PECO pallets — belong to pooling companies and should not be taken.
Beyond the stamp, consider what the pallet was used for. One that carried chemical, agricultural, or petroleum products carries contamination risk regardless of treatment code. If you can’t determine its history, leave it.
UK Pallet Sizes
UK standard pallets measure 1200 x 1000mm. Euro pallets measure 1200 x 800mm. US standard pallets (48 x 40 inches, roughly 1220 x 1016mm) are a different size again. If you’re planning a build using dimensions from a US guide, recalculate for the actual pallets you have. Mixing pallet sizes in the same wall creates alignment problems, so sort your pallets by size before you start.
Whole Pallets vs Dismantled Pallet Wood
This is the most consequential decision in the build, and most guides skip past it entirely.
Using whole pallets as wall panels is faster. You screw pallets together edge-to-edge, fill gaps with offcuts or boards, and the structure can go up in a weekend. The gaps between deck boards provide natural ventilation, which matters if you’re planning a workshop. The downside is that the walls look like pallets, have air gaps that let in draughts, pests, and moisture, and need lining or cladding to be weather-tight.
Dismantling pallets first and using the individual boards as cladding gives you much more control over the result. The walls can be made genuinely weather-tight, finished properly, and the overall appearance is closer to conventional timber cladding. The cost is time. According to Canadian Woodworking, two people take roughly 10 minutes to fully disassemble a single pallet. For a 47-pallet shed, that’s around eight hours of disassembly alone, before any building starts.
For most garden sheds, a hybrid approach works well: use whole pallets for the structural frame where they’ll be clad or lined anyway, then use dismantled boards for the visible exterior surface. You get structural speed without sacrificing weatherproofing.
Where to Get Pallets in the UK
The most reliable sources of free pallets in the UK are industrial estates, supermarket distribution depots, builders’ merchants, and farm suppliers. Many businesses accumulate more pallets than they can return and will let you take clean HT-stamped ones for nothing.
Facebook Marketplace and Gumtree regularly carry free pallet listings in most UK towns and cities. Search “free pallets” and filter to your area. Collections tend to be immediate.
Collect more than you think you need. Pallets are rarely identical and some will have cracked, warped, or soft timber that needs to be culled. Having spares avoids a mid-build materials shortage. If you’re planning a shed and want ideas for using up leftover pallet boards, a pallet garden or cold frame from pallets are practical ways to use the offcuts.
How Many Pallets You Need
The number depends on shed size, pallet dimensions, wall height, roof design, and whether you’re using whole pallets or dismantling them. These figures come from documented builds using whole pallets:
- Small shed (roughly 6 x 4ft): around 20 pallets
- 8 x 12ft shed: approximately 47 pallets (based on a well-documented Canadian build using pallets on skids)
- Larger workshop (7m x 3m): around 140 pallets
Treat these as starting points. Add 10 to 15 percent for wastage when sourcing.
Materials Beyond Pallets
Free pallets cover the structural frame and potentially the cladding, but you’ll need to budget for roofing materials, fixings, and wood treatment. For roofing, you have two main options: roofing felt or EPDM rubber membrane. Roofing felt is cheap and widely available but typically lasts 5 to 10 years. EPDM rubber membrane costs more upfront but carries a manufacturer lifespan of 50 years or more, making it the better long-term choice for a permanent structure. Either way, you’ll need plywood or OSB sheets as roof decking underneath.
Other costs to plan for: joist hangers and structural brackets, damp-proof membrane for the base, exterior wood preservative, and timber for door and window frames if you’re not sourcing these salvaged. Associated Pallets estimate a material cost of under £100 for an 8 x 12ft shed with free pallets. UK builds have documented total costs ranging from £45 to £300 depending on what is salvaged versus bought new.
UK Planning Permission
In England, garden sheds fall under permitted development — no planning permission required — as long as you meet all of the following conditions:
- The shed is positioned behind the principal elevation of the house
- Single storey only
- Maximum eaves height of 2.5 metres
- Maximum overall height of 4 metres for a dual-pitched roof, or 3 metres for any other roof type
- Maximum total height of 2.5 metres if the structure is within 2 metres of any boundary
- The shed and any other additions combined cover no more than 50% of the land around the original house
If your property is a listed building, in a conservation area, AONB, or National Park, different rules apply. In conservation areas, outbuildings to the side of properties require planning permission. Outbuildings more than 20 metres from the house in these areas are also limited to 10m² floor area.
Building regulations are separate from planning. Sheds under 15m² floor area are generally exempt from building regulations, with no sleeping accommodation. Those between 15 and 30m² are exempt if there’s no sleeping accommodation and the structure is either more than 1 metre from the boundary, or substantially non-combustible if it falls within 1 metre. Over 30m² requires building regulations approval. In Scotland, different rules apply: planning permission is needed if any part of the building is within 1 metre of a neighbouring property or exceeds 2.5 metres in height.
Building the Shed
Foundation
The foundation is where most pallet sheds fail early. Pallet wood sitting directly on damp ground will rot within a few years regardless of how well the rest of the build is done. You need to raise the structure off the ground and prevent moisture migrating upward.
A skid foundation is the simplest approach: two or more timber bearers laid on level, compacted ground, with the floor structure resting on top. The skids should sit on concrete blocks or paving slabs, not directly on soil. A damp-proof membrane between skids and slabs reduces moisture transfer further. A concrete slab is more robust for a permanent structure or workshop, but for a garden storage shed, skids on blocks are adequate provided the site drains well. There’s more detail on preparing a proper base in this guide to building a shed foundation.
Level the base carefully before building anything on it. Small variations compound as walls go up.
Frame and Walls
The 2×4 stringers running through each pallet are the structural timber. For whole-pallet walls, stand pallets vertically and bolt or screw them together at corners, using structural brackets at the base to anchor to the floor frame. Diagonal bracing across at least two walls prevents racking in structures above roughly 1.8 metres in height.
For dismantled builds, construct a conventional stud frame from salvaged 2×4 stringers and apply deck boards as cladding in an overlapping or featheredge pattern to shed water. This takes longer but produces a tighter, more weatherproof wall.
Roof
A simple pitched roof is the most practical choice for a pallet shed. It sheds water, allows for ceiling height at the centre, and is structurally straightforward. Build the ridge beam and rafters from salvaged 2×4 timber, spacing rafters no more than 600mm apart. Deck the rafters with OSB or plywood, then apply roofing felt (lapping each course at least 75mm, starting from the eaves) or an EPDM rubber membrane.
The roof covering is the shed’s most critical weather seal. A roof done poorly is the most common reason pallet sheds are written off within a few years of being built.
Door
A ledged-and-braced door made from pallet deck boards is the standard approach. Build a door frame from 2×4 timber and run the diagonal brace from the bottom-hinge corner to the top-latch corner. This prevents the door from sagging over time. Salvaged doors from skips, architectural salvage yards, or Facebook Marketplace save time and often look better than a site-built pallet door.
Weatherproofing and Treatment
Untreated pallet wood exposed to UK weather will last roughly 2 to 3 years before rot becomes a serious problem. With proper treatment and maintenance, the same structure can last 20 years or more. Apply an exterior-grade wood preservative before assembly where possible, paying particular attention to end grain. Apply a second coat to all external surfaces once the shed is complete. Products combining a fungicide with a water repellent are the practical choice for this type of build.
Seal all external joints with flexible exterior sealant, especially at the junction between walls and roof, and anywhere two boards meet with a gap. Re-treat the exterior every one to three years depending on exposure. Check for soft spots annually and address them before they spread.
Pallet Shed vs Buying a Shed
A comparable flat-pack timber shed in the 8 x 6ft range costs £800 to £1,500 to supply, plus £200 to £500 for installation. A pallet shed of similar size built with free pallets can cost under £100 in materials. That saving is real. The trade-off is time and effort.
Pallet wood is irregular and awkward to work with. Disassembly is slow. The build takes considerably longer than working with prepared timber. One UK builder who completed a home-office-sized pallet shed for under £300 described the result as “much better quality than a cheap £500 shop shed” — but that came from careful, time-consuming construction, not simply assembling pallets. The full comparison of both approaches is covered in more depth in this guide on DIY shed vs buying one.
If you have the time and treat the materials properly, a pallet shed is a legitimate and durable build. If you need something up quickly with minimum effort, a flat-pack shed will be the more predictable option.
