For cushions and everyday garden accessories, I usually start with resin storage because it is straightforward to clean and does not need timber preservative. Timber is worth considering when you want the storage to fit the garden’s appearance or need a structure that can accommodate suitable shelving. Metal deserves a closer look for valuable equipment, but judge the complete unit rather than assuming a metal box is secure.
The quality of the doors, floor, joints and installation can matter more than the material name. A well-supported lightweight store can do its job reliably; a badly assembled one can have awkward doors or gaps regardless of what its panels are made from.
What changes with each material?
| Material | Why I would consider it | What I would inspect closely |
|---|---|---|
| Resin/plastic | Convenient cleaning and no routine timber-preservative treatment | Panel construction, hinges, floor support, approved fixing points and available spare parts |
| Timber | A traditional appearance and scope for suitable shelving or repairs | Framing, cladding, roof covering, treatment type and access for maintenance |
| Metal | Options with substantial construction and purpose-designed security features | Panel thickness, coatings, ventilation, locks, anchoring and treatment of damage |
These are buying considerations, not promises that every product in a category has those advantages. Compare stores of a similar size and intended use. A light cushion chest and a reinforced equipment shed are doing different jobs.
Plastic: practical for frequent everyday use
My Keter Marvel+ 270L went together without much fuss and has kept its contents dry through heavy rain. That makes it a useful option for the cushions and garden toys that fit inside. I still check the connections, keep it level and avoid forcing an overfilled lid shut.
With larger plastic stores, I pay attention to the assembled structure rather than judging a loose panel in isolation. Some flexibility during assembly does not tell you how the finished unit will behave. Equally, I would not lean heavy equipment against a thin wall and expect it to act like a supporting rack.
Use the maker’s cleaning method and check whether shelves or hooks need particular brackets. “Low maintenance” does not mean ignoring loose fastenings, obstructed ventilation or a lid that has stopped closing correctly. Keter’s product guidance is a useful starting point, followed by the instructions for the exact model.
Timber: look at the treatment and the roof
A timber store can sit comfortably beside fencing and planting, but look past the colour in the sales photograph. Check the framing, floor construction and roof covering, then work out whether you can reach the sides and back after installation.
Do not assume every timber shed needs the same annual treatment. Forest distinguishes pressure-treated and dip-treated products, and maintenance requirements depend on the product and guarantee conditions. Read the manufacturer’s care guidance before budgeting for ongoing treatment.
Roof coverings, hinges and drainage still need attention even when the timber has a long anti-rot guarantee. Keep vegetation from burying the walls and preserve the specified airflow beneath the structure. A guarantee against rot is not a guarantee that any site or installation will keep the contents dry.
If you intend to add shelves, choose appropriate supports and fix into the structure as instructed. Do not load thin cladding as if it were a solid wall. For a narrow tool cupboard, the Forest Apex Tall Garden Store is one timber format to investigate; confirm usable internal height for your equipment.
Metal: inspect ventilation and the whole security design
Metal ranges from light panels assembled with small fixings to much heavier structures with reinforced doors and integrated locking. Compare the door frame, hinges, lock mechanism and anchoring arrangements. A strong lock has limited value if the surrounding construction is easy to distort.
Condensation is another buying check. Asgard uses built-in ventilation and advises leaving airflow around its units, while acknowledging that moisture can still form in extreme conditions. Do not block vents with stored equipment or pack the unit tight against a wall where the installation instructions require space.
Its maintenance advice also covers cleaning and treatment of damaged coatings. In a coastal garden, check the maker’s specific care requirements for salt exposure rather than assuming galvanised or coated metal needs no attention.
Rain resistance does not settle the damp question
A closed store may shed rain yet still contain moisture from wet tools, soil or damp fabric. Store items dry where their care instructions require it, keep ventilation clear and investigate persistent moisture. Sealing every gap is not a sensible general fix when some openings are there deliberately.
For cushions, read the winter storage guidance. For the structure itself, start with a suitable level base and the exact installation requirements.
Choose the construction that suits the contents
For a patio chest, I would prioritise the opening, usable dimensions and a lid that is easy to manage. For a tool store, I would look harder at access, structural supports and security. Then compare the maintenance you are prepared to do.
Once you know which material suits you, use my garden storage box guide for smaller contents or the mower and tool storage guide for larger equipment. Buy the model that meets the whole job, rather than paying extra for a material label alone.
