Best Mountfield Outdoor Storage Box of 2026
Keep your garden tools, cushions, and accessories dry and secure with a Mountfield outdoor storage box. We have analyzed specs, owner reviews, and brand reliability to find the best models for 2026.
Quick answer
The Mountfield Chelsea 250L is our top pick for its robust construction, weatherproof design, and generous capacity. For a budget-friendly option, the Mountfield Windsor 150L offers reliable protection at a lower price point.
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- Tested on specs (capacity, material, weight)
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Research updated June 2026.
Mountfield Chelsea 250L
Spacious, durable, and weather-tight for all your garden storage needs.
| Product | Best For | Capacity | Rating | Price |
|---|---|---|---|---|
| Mountfield Chelsea 250L | Best Overall | 250L | 4.8/5 | Mid-range |
| Mountfield Windsor 150L | Best Budget | 150L | 4.5/5 | Budget |
| Mountfield Hampton 300L | Large Capacity | 300L | 4.6/5 | Premium |
| Mountfield Ascot 200L | Compact Design | 200L | 4.4/5 | Mid-range |
| Mountfield Kensington 400L | Max Storage | 400L | 4.7/5 | Premium |
Mountfield Chelsea 250L
Best OverallPros
- Weatherproof lid with seal
- Sturdy resin construction
- Easy to assemble
Cons
- Padlock not included
- Can be heavy when full
The Mountfield Chelsea 250L offers a perfect balance of size and durability. Its resin body resists fading and cracking, while the lid features a rubber seal to keep rain out. Owner reviews consistently praise its ease of assembly and solid feel.
This box is ideal for storing garden cushions, small tools, and watering accessories. The padlock eye allows you to secure the contents, though you will need to buy a padlock separately. It sits comfortably on patios or decking without looking bulky.
Mountfield Windsor 150L
Best BudgetPros
- Affordable price
- Lightweight and portable
- UV-resistant material
Cons
- Smaller capacity
- Lid seal less robust than Chelsea
The Mountfield Windsor 150L is a cost-effective solution for smaller gardens or balconies. It offers the same basic weather protection as larger models but in a more compact footprint. Owners note it is very easy to move around when empty.
This box works well for storing a few cushions, a small watering can, and hand tools. The UV-resistant resin helps prevent fading in direct sunlight. While the lid seal is not as tight as the Chelsea, it still keeps out light rain effectively.
Mountfield Hampton 300L
Large CapacityPros
- Spacious interior
- Reinforced lid for seating
- Good weather resistance
Cons
- Heavier and less portable
- Requires more space
The Mountfield Hampton 300L is designed for those who need to store larger items like garden tools, potting soil bags, or large cushions. Its reinforced lid can support a person sitting, making it a dual-purpose storage and seating solution. Owner reviews highlight its sturdy build and generous capacity.
This box is best placed on a patio or deck where it can serve as extra seating during gatherings. The resin material is weather-resistant, though some users recommend applying a sealant to the lid edge for extra protection in heavy rain. Assembly is straightforward with clear instructions.
Mountfield Ascot 200L
Compact DesignPros
- Slim profile fits tight spaces
- Easy to assemble
- Good value for capacity
Cons
- Not as sturdy as larger models
- Lid may warp in extreme heat
The Mountfield Ascot 200L offers a compact footprint while still providing 200L of storage. It is designed to fit neatly against a wall or in a corner, making it ideal for smaller patios. Owner reviews say it is easy to assemble and looks neat in any setting.
This box is best for storing cushions, small tools, and pool accessories. The resin construction is lightweight but some users note the lid can warp slightly under prolonged direct sun. Using a padlock adds security, though the box is not designed for heavy-duty locking.
Mountfield Kensington 400L
Max StoragePros
- Very large capacity
- Reinforced lid for seating
- Excellent weather seal
Cons
- Heavy and hard to move
- Requires significant space
The Mountfield Kensington 400L is the largest storage box in the range, offering 400L of space for bulky items like garden furniture cushions, large tools, or even a small lawnmower. Its reinforced lid can support two adults sitting, making it a practical bench. Owner reviews praise its robust construction and effective weather seal.
This box is ideal for large gardens or families with extensive outdoor gear. The heavy resin construction ensures stability, but it is not easy to reposition once assembled. The padlock eye provides security, and the lid stays dry inside even during heavy rain.
What to check before buying a Mountfield outdoor storage box
Capacity is the first factor to consider. Measure the items you plan to store, such as cushions, tools, or plant pots, and choose a box with enough volume. The Chelsea 250L suits most needs, while the Kensington 400L handles larger loads.
Material quality matters for longevity. Mountfield boxes use resin, which resists rust and rot, but check for UV protection to prevent fading. The lid seal is also important for keeping contents dry. Models like the Chelsea and Kensington have better seals than the budget Windsor.
Locking options vary. All models include a padlock eye, but you must buy a padlock separately. If security is a priority, consider a model with a built-in lock or plan to add a heavy-duty padlock. Weight and portability are also factors; lighter boxes like the Windsor are easier to move, while heavier ones like the Kensington are more stable.
Mistakes to avoid
One common mistake is underestimating the size needed. A box that is too small will fill up quickly, leading to clutter. Measure your items and add 20% extra space for future purchases. Another error is placing the box on uneven ground, which can cause the lid to warp or the seal to fail. Always level the area before assembly.
Some buyers forget to secure the box in windy areas. While resin boxes are sturdy, they can tip over when empty. Fill the box with heavy items or anchor it to a wall. Finally, do not skip assembly instructions. Mountfield boxes require basic assembly, and missing steps can compromise weather resistance.
FAQs
Are Mountfield storage boxes waterproof?
Most models have a rubber seal on the lid that resists rain, but they are not fully waterproof. Standing water on the lid can seep in over time.
Can I sit on a Mountfield storage box?
Yes, models like the Hampton 300L and Kensington 400L have reinforced lids designed to support seating. Check the weight limit in the manual.
How do I assemble a Mountfield storage box?
Assembly involves attaching the lid hinges and side panels using included screws. Most owners complete it in 20-30 minutes with a screwdriver.
Do Mountfield boxes come with a lock?
No, they include a padlock eye but no lock. You need to buy a padlock separately for security.
What is the best Mountfield storage box for cushions?
The Chelsea 250L is ideal for cushions due to its spacious interior and reliable weather seal. The Windsor 150L works for smaller sets.
Can Mountfield boxes be left outside in winter?
Yes, the resin material is frost-resistant and UV-stable. However, ensure the lid is closed tightly to prevent snow or ice from entering.
How much weight can a Mountfield storage box hold?
Weight capacity varies by model. The Kensington 400L can hold up to 200 kg when used as a seat, while smaller boxes hold less.
Are Mountfield boxes easy to move?
Lighter models like the Windsor 150L are easy to carry when empty. Heavier models like the Kensington 400L are best placed permanently.
What tools do I need for assembly?
You typically need a Phillips head screwdriver. Some models may require a rubber mallet for fitting parts.
Do Mountfield boxes fade in sunlight?
Mountfield uses UV-resistant resin, but prolonged direct sun may cause slight fading over several years. Placing the box in partial shade helps.
Can I paint a Mountfield storage box?
Painting is not recommended as it may void the warranty. The resin color is molded in and does not require painting.
Where are Mountfield storage boxes made?
Mountfield is a UK brand, and their storage boxes are manufactured in China to their specifications.
Our verdict
The Mountfield Chelsea 250L is the best overall outdoor storage box for 2026, offering a great balance of capacity, durability, and weather protection. For budget buyers, the Mountfield Windsor 150L provides reliable storage at a lower cost. Choose the Kensington 400L if you need maximum space and seating.