Garden tools, BBQ accessories, kids' bikes, last summer's parasol, the lawnmower, the bag of compost you didn't quite finish. None of it has anywhere to live. So it ends up in the kitchen, the hallway, the boot of the car, or piled in the corner of the patio under a tarpaulin that's slowly giving up. If that sounds familiar, your garden has an outdoor storage problem.
The good news is that the solution doesn't have to be expensive or complicated. A modern metal shed costs less than a sofa and lasts for years. A lean-to design tucks against a wall and uses space you weren't using anyway. A greenhouse-shed hybrid does double duty for anyone who actually grows things. This guide walks through the main outdoor storage options for British gardens, what each one suits, and how to pick the right size for what you actually own.
Start with what you're actually storing
Most outdoor storage mistakes come from buying for what you wish you had rather than what you've got. Before looking at any specific shed, take five minutes to roughly catalogue the things you need to put somewhere. The size, security, and ventilation requirements all flow from that list.
Garden tools (spade, fork, rake, trimmers): need height for upright storage, hooks if possible, doesn't require much depth.
Lawnmower: takes up serious floor space (typical petrol mower needs roughly 80cm x 60cm), needs a low threshold for wheeling in and out.
Bikes: surprisingly demanding on floor area, especially if more than one. A typical adult bike needs around 180cm of floor length.
Cushions, parasols, BBQ kit: bulky but light, can be stacked or stored on shelves rather than the floor.
Pots, compost, fertiliser: need ventilation to avoid damp build-up, and a stable surface.
Seasonal items (Christmas decorations, sun loungers): low-frequency access, fine to store at the back or on top.
Add up the floor area you genuinely need plus 20 percent for circulation, then look at sheds. Most people undershoot by a third on the first attempt.
Outdoor storage at a glance
Type
Best for
Lifespan
Security
Galvanised metal shed
Tools, equipment, year-round use
10+ years
High (lockable, solid)
Lean-to shed
Tight gardens, side returns, BBQ storage
10+ years
High
Temporary tent-style shed
Bikes, BBQ, seasonal storage on a budget
3-5 years
Low (zip access)
Wooden vertical shed
Balconies, narrow gardens, neat styling
5-10 years (with treatment)
Medium
Greenhouse-shed hybrid
Growing plus tool storage in one footprint
8-10 years
Medium
Galvanised metal sheds
Metal sheds have quietly become the default outdoor storage choice for British gardens, and there are good reasons for that. Galvanised steel doesn't rot, doesn't need painting, and shrugs off rain in a way that wood and plastic struggle to match. Modern designs have moved on from the noisy, draughty boxes you might remember. Today's metal sheds come with sloped roofs to shed water, ventilation panels to prevent condensation, lockable doors, and clean exterior finishes that don't look out of place in a normal garden.
Sizes and what fits in them
Three rough size brackets cover most needs:
Compact (around 6 x 4ft, roughly 180 x 120cm): fits a standard lawnmower, a few tools, and seasonal kit. The Outsunny Galvanised Metal Garden Shed at 6.3 x 4.3FT is a good example, with a lockable door and ventilation built in.
Medium (around 7 x 5ft to 9 x 6ft): adds room for a couple of bikes alongside tools, or a workbench and shelving. Lean-to versions of this size fit neatly against a fence or house wall.
Large (10 x 8ft and up): proper outbuilding territory. Lawnmower, bikes, workbench, BBQ, seasonal kit, all in one place. The Outsunny 11.3 x 9.2FT Steel Garden Shed is at the upper end with double sliding doors and a sloped roof.
What to look for
Galvanised or powder-coated steel rather than thin-gauge metal. Galvanisation gives a consistent rust-resistant finish that lasts years.
Sloped or pent roofs. Flat metal roofs collect water and eventually leak around the panel joints.
Ventilation panels. A sealed metal shed gets condensation inside it overnight as temperatures drop. Ventilation prevents tools rusting and stops cushions getting damp.
Lockable doors. Most metal sheds include a latch and lock system. If yours doesn't, add a quality padlock from day one.
A solid base. Metal sheds usually don't come with a floor, so they need to sit on concrete, paving, or a treated wooden base. Putting one on bare grass is the most common cause of premature failure.
What metal sheds aren't great at
Aesthetics in traditional gardens. A galvanised steel shed in a chocolate-box cottage garden looks slightly out of place. Powder-coated darker grey models blend better.
Insulation. They're cold in winter and hot in summer. Fine for storage, not great for using as a workshop.
Quiet during heavy rain. Rain on a metal roof is louder than rain on wood. If your shed is right outside a bedroom window, this is worth considering.
Lean-to and side-of-house sheds
The cleverest outdoor storage solutions use space you weren't really using anyway. The strip down the side of the house, the dead corner against a fence, the gap between the patio and the back wall. Lean-to designs are built specifically for these awkward spots, and for many British gardens they're the most sensible option even if you have room for a freestanding shed.
The Outsunny 5 x 7FT and 7 x 5FT Garden Sheds in our range are good examples of the lean-to format. They're built with a flat back wall designed to sit against a house wall or fence, sliding doors that don't need clearance to open, and two ventilating windows to handle airflow. Internally they include two adjustable shelves and two hooks, which means you can use the vertical space rather than just the floor.
Where lean-to sheds make sense
Side returns and narrow paths down the side of the house. Most lean-to sheds are around 60 to 90cm deep, which is exactly the dead space most British semis and terraces have.
Where a freestanding shed would block a view or a path.
Bike storage. The Outsunny lean-to designs are explicitly suitable for bikes, providing weatherproof cover without requiring a full traditional shed.
Generator or BBQ storage. The lean-to-against-the-wall format lets you keep something with venting needs sheltered without sealing it in a full shed.
Temporary tent-style sheds
Temporary or tent-style garden sheds sit at the entry-level end of outdoor storage. They're built around a lightweight steel frame with a heavy-duty waterproof canopy stretched over it. They go up in an hour with two people, and they cost a fraction of a permanent metal shed.
They genuinely solve a real problem. If you need somewhere to put bikes or a BBQ between now and spring, or you're renting and don't want to commit to a permanent structure, or you're testing whether you actually need a proper shed before spending the money, a temporary tent shed does the job. The waterproof canopies on quality designs really do keep contents dry. The trade-offs are honest: lower security (zip access rather than locks), shorter lifespan (typically 3 to 5 years), and they don't look like permanent garden architecture.
Best uses
Bike storage in a small back garden where a metal shed feels like overkill.
Seasonal cover for items you don't want indoors but don't need to lock away.
Short-term storage during a renovation or move.
Renters who want garden storage without a permanent installation.
Wooden vertical sheds
If your space is genuinely tiny, including balconies, courtyard gardens, or terraced houses with no garden to speak of, a tall narrow wooden shed can solve a storage problem that no other format addresses. These sit against a wall and store upright items (tools, brooms, folded chairs) without any floor area to speak of. Our white wooden garden shed has the tall narrow profile typical of the format, with a sturdy build and secure features that keep contents dry and tidy.
The trade-off versus metal is maintenance. Wood needs an annual coat of treatment (more often if it gets a lot of weather exposure) to keep it looking good and lasting well. The visual reward is real though: wooden sheds sit naturally in any garden in a way that metal can struggle with, and a white-painted vertical shed adds character rather than feeling industrial.
Greenhouse-shed hybrids
If you grow plants and need tool storage, a greenhouse-shed combination uses one footprint for both jobs. These typically pair a polycarbonate greenhouse front (for growing) with a smaller solid storage section at the back or side. They cost more than a basic shed but less than a separate greenhouse plus shed.
They suit gardeners who actually use a greenhouse year-round (seedlings in spring, tomatoes in summer, overwintering tender plants) and who'd otherwise need two separate structures. If you're just thinking about a greenhouse "in case you get into gardening" they're harder to justify, but for committed growers they're a smart use of space. Worth pairing this kind of decision with a proper read-through of the greenhouses collection if growing is the priority.
Where to put your outdoor storage
Even the best shed underperforms in the wrong spot. A few things to think about before you assemble:
Foundations
Metal sheds need a solid, level base. Concrete is ideal, paving slabs are fine, treated wooden bases work well. Sitting a metal shed on bare grass or compacted soil leads to rust, drainage issues, and door alignment problems within a couple of seasons. Spend an hour preparing a proper base and the shed will last twice as long.
Drainage
Don't put a shed at the lowest point of the garden where water naturally collects. Even a well-built shed struggles with constant ground moisture. If your garden has a slope, place the shed on the higher side.
Access
Think about how you'll actually use the shed. Door clearance for sliding designs is less important than for swing doors, but you still need enough room to wheel a mower in and out comfortably. A shed in a corner you have to fight your way to ends up empty within a year.
Planning permission
Most domestic sheds in the UK don't need planning permission, provided they cover less than 50 percent of the garden, are under 2.5 metres high near boundaries, and aren't used as living accommodation. Check with your local council if your shed is taller, larger, or in a conservation area.
Quick answers to common questions
Are metal sheds better than wooden sheds?
For storage purposes, metal sheds are usually the more practical choice. They don't rot, don't need annual treatment, resist break-ins better, and last 10 years or more with minimal maintenance. Wooden sheds look more traditional and can be customised more easily, but they need ongoing care to stay in good condition.
Do I need planning permission for a garden shed?
In most cases, no. UK planning rules generally allow domestic sheds up to 2.5 metres high without permission, provided they cover less than 50 percent of the garden and aren't used as living accommodation. Conservation areas and listed properties have stricter rules, so check with your council if either applies.
How do I stop condensation in a metal shed?
Choose a shed with built-in ventilation panels and don't place it on damp ground. Adding a thin foam or bubble-wrap layer to the inside of the roof can reduce condensation further. Avoid storing damp items (wet mowers, soaked cushions) inside without letting them dry first.
Can I put a metal shed on grass?
Technically yes, but it's not recommended. Metal sheds need a solid, level base to stop the structure twisting, prevent water damage, and keep the doors aligned. Concrete, paving slabs, or a treated wooden base all work well. Bare grass leads to problems within a couple of seasons.
Putting it all together
The best outdoor storage solution depends on what you're storing, how much garden space you have, and how secure you need the contents to be. A galvanised metal shed is the workhorse choice for most UK gardens. A lean-to design wins where space is tight or you have an awkward side return. Temporary tent-style sheds bridge the budget gap, and a greenhouse-shed hybrid earns its place if you actually grow things. The white wooden vertical shed handles the smallest spaces.
To browse the full range, head to the garden storage and garden sheds collections. Free UK mainland delivery applies on every order, dispatched within three to five working days, with no hidden fees at checkout. Larger sheds ship on substantial pallets and benefit from a second person for unloading and assembly, so plan delivery day accordingly. Most of the Outsunny range can also be cross-referenced against our Outsunny brand review if you want a deeper sense of what to expect from the build quality and finish.