The height, diameter, and installation depth of a bollard will depend on its intended use, the level of vehicle protection required, and the environment it is being installed in.
In most UK applications, bollards are installed at a height of 900mm to 1200mm above ground level. This range ensures the bollard is clearly visible to drivers while remaining effective at preventing vehicle access. Driveways, car parks, and commercial premises typically follow this standard for both safety and practicality.
The diameter of a bollard varies depending on the level of impact resistance needed. For general-purpose or low-traffic areas, diameters may start from around 90mm, while more robust installations—such as industrial sites, warehouses, or high-security locations—often use bollards between 114mm and 200mm diameter. Thicker and wider posts provide increased strength and resistance to vehicle impact.
Equally important is the installation depth, which plays a critical role in overall performance. As a general rule, at least 25–30% of the bollard’s total length should be set below ground and secured in concrete. For example, a bollard with a 1000mm visible height would typically require a 300–400mm foundation depth, although this can increase depending on ground conditions and expected impact loads.
For high-security or anti-ram applications, deeper foundations and larger diameters may be required to achieve the necessary level of protection. Ground type, drainage, and surrounding infrastructure should also be considered when determining the final specification.
At Aremco Barriers, our UK-manufactured steel bollards are designed with these factors in mind. Whether you require fixed, removable, or retractable (telescopic) bollards, we can advise on the correct size and installation method to ensure long-term strength, stability, and performance.
