Best Outdoor Storage Box Under £100
Keep your garden cushions, tools, and kids' toys dry and tidy without breaking the bank. We have rounded up the top-rated outdoor storage boxes under £100 that offer real durability and weather resistance.
Quick answer
The Keter Corfu 150L is our top pick for best overall under £100. It offers a robust resin build, a 150-litre capacity, and a stylish wood-effect finish, making it the best balance of price, durability, and capacity for most gardens.
Why trust ToolBuyerHub
- Tested on specs (capacity, material, weight limit)
- Weather resistance & UV protection compared
- Aggregated owner reviews from major retailers
- Build quality & warranty checked
- Brand reliability (Keter, Suncast, Forest)
- No fake hands-on claims
Research updated June 2026.
Keter Corfu 150L
Top-rated resin box with wood-effect styling and excellent weather resistance.
| Product | Best For | Key Spec | Rating | Price |
|---|---|---|---|---|
| Keter Corfu 150L | Best Overall | 150L, Resin, 100kg limit | 4.6/5 | Check |
| Suncast 100L Deck Box | Best Value | 100L, Resin, 50kg limit | 4.4/5 | Check |
| Forest Garden 4x3 Wooden | Best Wooden | 150L, FSC Pine, 80kg limit | 4.3/5 | Check |
| Keter 300L Storage Box | Best Large Capacity | 300L, Resin, 120kg limit | 4.5/5 | Check |
| Plastor 200L Storage Box | Best Heavy Duty | 200L, Polypropylene, 150kg limit | 4.2/5 | Check |
What to look for in a budget outdoor storage box
When shopping for a storage box under £100, focus on three things: material, capacity, and weather resistance. Resin (polypropylene or polyethylene) is the most common material at this price point. It is lightweight, UV-resistant, and does not rot. Wooden boxes offer a more natural look but require annual treatment to prevent weathering. Check the weight limit to ensure the box can hold your items; most budget boxes support between 50kg and 150kg.
Look for features like a lockable lid (for security), gas struts (to keep the lid open safely), and drainage holes to prevent moisture buildup. Customer reviews often mention assembly difficulty, so check for tool-free assembly options. Brands like Keter, Suncast, and Forest Garden consistently receive positive feedback for build quality at this price level.
Mistakes to avoid
A common mistake is choosing a box that is too small. Measure your largest items (e.g., a garden parasol base or large cushion) before buying. Another error is ignoring the weight limit; overloading a resin box can cause the lid or base to crack. Finally, do not assume all "weather-resistant" boxes are waterproof. Many budget boxes have gaps in the lid seal, so store items in dry bags if you need complete protection from rain.
Keter Corfu 150L
Best OverallPros
- Attractive wood-effect finish
- Good 150L capacity for the price
- Easy to assemble (no tools needed)
Cons
- Lid is not lockable out of the box
- Not fully waterproof in heavy rain
The Keter Corfu 150L is the most popular budget storage box on the market. Its resin construction mimics a slatted wood design without the maintenance. The 150L capacity fits four standard garden cushions or a small tool set. Assembly is tool-free and takes under 15 minutes according to owner reviews.
Some users report that the lid can warp slightly under direct sunlight, though this does not affect functionality. The box is weather-resistant but not fully waterproof; standing water can seep through the lid seam during prolonged downpours. Overall, it offers the best value for most buyers.
Suncast 100L Deck Box
Best ValuePros
- Very affordable price point
- Compact size fits small spaces
- UV-resistant material
Cons
- Lower weight limit than competitors
- Lid does not stay open on its own
The Suncast 100L Deck Box is the most budget-friendly option in our roundup. It is ideal for storing a few cushions, small garden tools, or children's outdoor toys. The resin is UV-treated to prevent fading, and the neutral colour blends with most patio furniture.
Owner reviews highlight the easy assembly and lightweight design. However, the 50kg weight limit means you cannot store heavy items like bags of compost or large pots. The lid also lacks gas struts, so you need to hold it open while accessing contents.
Forest Garden 4x3 Wooden Storage Box
Best WoodenPros
- Natural wood appearance
- FSC-certified timber
- Can be painted or stained
Cons
- Requires annual treatment
- Heavier than resin boxes
For those who prefer a natural look, the Forest Garden 4x3 Wooden Storage Box is the best choice. It is made from FSC-certified pine and has a 150L capacity. The dip-treatment provides initial weather resistance, but owners recommend applying a wood preserver annually to extend its life.
The box is heavier than resin alternatives, which makes it more stable in windy conditions. Assembly is straightforward but requires a screwdriver. Some users note that the lid can swell slightly in damp weather, so ensure it is treated properly before winter.
Keter 300L Storage Box
Best Large CapacityPros
- Huge 300L capacity
- Gas struts for safe lid opening
- Lockable lid (padlock not included)
Cons
- Large footprint may not suit small gardens
- Assembly can be fiddly
The Keter 300L Storage Box is the largest option that still falls under £100. It can store large items like a full set of garden furniture cushions, a lawnmower, or multiple tool bags. The lid features gas struts that keep it open safely, and it can be locked with a padlock for security.
Owner reviews praise the capacity and sturdy build. However, the box is quite large, so measure your available space before buying. Assembly is more complex than smaller Keter models, requiring about 30 minutes and two people for the lid alignment.
Plastor 200L Storage Box
Best Heavy DutyPros
- Highest weight limit (150kg)
- Reinforced lid and base
- Good value for heavy-duty use
Cons
- Basic design, no wood-effect finish
- Lid does not have gas struts
The Plastor 200L Storage Box is built for durability. It is made from thick polypropylene and can support up to 150kg, making it suitable for storing heavy items like bags of soil, tools, or even as a bench. The reinforced base prevents cracking under load.
Owner reviews highlight its robustness and easy assembly. The main trade-off is the plain, utilitarian appearance; it looks functional rather than decorative. The lid is also not self-supporting, so you need to prop it open. It is a great choice for a shed or garage alternative.
FAQs
Are outdoor storage boxes under £100 waterproof?
Most are weather-resistant, not fully waterproof. They can handle rain and splashes, but standing water may seep through lid seams. Store items in dry bags for complete protection.
Can I sit on an outdoor storage box?
Only if the weight limit allows. The Keter Corfu 150L and Plastor 200L support up to 100kg and 150kg respectively, so they can be used as a bench. Always check the manufacturer's spec.
How do I assemble a resin storage box?
Most resin boxes use a click-lock system that requires no tools. Align the panels and press them together. For wooden boxes, you will need a screwdriver. Assembly typically takes 15-30 minutes.
What is the best material for a budget storage box?
Resin (polypropylene or polyethylene) is best for under £100. It is lightweight, UV-resistant, and does not rot. Wooden boxes look better but need annual treatment.
Can I lock an outdoor storage box?
Many budget boxes have a hasp for a padlock, but it is not always included. The Keter 300L and Plastor 200L have lockable lids. Always buy a weather-resistant padlock separately.
How do I prevent mould inside the box?
Ensure items are dry before storing. Some boxes have drainage holes at the base. If not, drill a few small holes to allow airflow and water drainage.
What size storage box do I need for garden cushions?
A 100L box can hold 2-3 standard cushions. For a full set of 6-8 cushions, choose a 150L or 200L box. Measure your largest cushion before buying.
Are Keter storage boxes good quality?
Yes, Keter is a leading brand for resin storage. They offer good build quality, UV resistance, and easy assembly. Owner reviews are consistently positive for their budget models.
Can I paint a resin storage box?
It is not recommended. Resin is non-porous, so paint will peel. If you want a coloured box, buy one in the desired colour. Wooden boxes can be painted or stained.
Do outdoor storage boxes need to be anchored?
In windy areas, yes. Lightweight resin boxes can blow over. Fill the bottom with heavy items or use ground anchors. Wooden boxes are heavier and more stable.
Our verdict
For most people, the Keter Corfu 150L is the best outdoor storage box under £100. It combines a stylish wood-effect finish, ample capacity, and easy assembly at a great price. If you need more capacity, the Keter 300L offers excellent value. For heavy loads, the Plastor 200L is the most durable option. Avoid the Suncast 100L if you need to store heavy items, but it is fine for light use on a tight budget.