Square vs Round Hollow Composite Decking: Which is Best for UK Gardens?
Introduction
When it comes to composite decking in the UK, one of the most common questions we hear is: what’s the difference between square hollow and round hollow boards?
Both types of hollow decking are designed to reduce weight and cost compared to solid boards. But the shape of the hollow core — whether square or round — can impact durability, performance, and even installation.
In this guide, we’ll break down the pros and cons of each so you can make the right choice for your British garden project.
What Are Hollow Composite Decking Boards?
Composite decking boards are typically manufactured in three main styles:
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Solid boards – heavy, premium, strongest option.
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Square hollow boards – lighter with square voids inside.
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Round hollow boards – lighter with circular voids inside.
Hollow boards are particularly popular in the UK because they’re affordable, easier to handle, and still perform well in typical garden settings.
Square Hollow Composite Decking
Advantages
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Strong structural profile – square voids often provide greater rigidity underfoot.
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Traditional look & feel – feels closer to solid boards when walking across.
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Better for high-traffic areas – patios, walkways, BBQ zones.
Disadvantages
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Slightly heavier than round hollow.
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Usually costs a bit more per board compared to round hollow.
Round Hollow Composite Decking
Advantages
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Lightweight – easier to carry and install, ideal for DIY projects.
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Lower price point – often the most cost-effective option.
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Sufficient for standard residential use – garden seating areas, smaller patios.
Disadvantages
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Less rigid than square hollow under heavy loads.
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May flex more in wide spans.
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Better suited to light-medium traffic gardens.
Which One Should You Choose in the UK?
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For strength and durability: Go with square hollow boards — especially if your decking will be used daily or needs to handle heavier garden furniture.
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For budget-friendly DIY projects: Round hollow boards are a great option that balances affordability with performance.
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For long-term investment: Consider solid boards, though they come at a higher price point.
Vigo Home Recommendation
At Vigo Home, we stock both square and round hollow composite decking boards in a variety of colours and finishes. All our boards are factory-direct, so you get the best value in the UK.
Whether you’re planning a small DIY deck in Northamptonshire or a large garden project in London, our team can help you choose the right board for your needs.
Conclusion
Choosing between square and round hollow decking boards comes down to budget vs strength. Square hollow gives you extra durability, while round hollow keeps costs and weight low.
👉 Ready to get started? Browse our composite decking range and enjoy England-wide delivery, free over £1,500.