Overhang on countertops – how it works

An overhang means that the countertop extends beyond the base, without direct support underneath the entire surface. It can be used on kitchen islands or bar counters to create space for seating, for example, but it can also be a design choice to give the kitchen a more open and modern feel. To ensure the overhang is durable and safe, there are certain rules and recommendations to follow.

Free-hanging overhang

A free-hanging overhang can extend up to 250 mm without the need to reinforce the construction. This means the countertop can project a bit from the base and still withstand normal use. This offers great flexibility when planning, for example, a kitchen island or a bar counter.

Partially free-hanging overhang

For a partially free-hanging overhang, the same measurement applies – up to 250 mm without additional reinforcement. The difference here is that part of the countertop still rests on the base, while another part extends freely. This can be a good option if you want to combine stability with a more open design.

When the countertop has cut-outs

If the countertop includes cut-outs, for example for a sink or a cooktop, while also having an overhang, the conditions change. In this case, specific minimum measurements must be taken into account to avoid cracks or weaknesses in the material.

Important for heavy loads

It’s also important to keep in mind that a free-hanging overhang has its limits when it comes to weight. For a static load exceeding 100 kg, the overhang should be limited to 100–200 mm to ensure structural integrity.

Reinforcements for longer overhangs

When a countertop is installed with a longer overhang or without continuous support, reinforcement is required to guarantee both stability and durability. This is a common solution in kitchen environments and can be carried out in several ways, such as using metal plates, iron brackets, or support legs.

The reinforcement must always follow the same basic principles: it should be completely rigid, stable, and level with the cabinet frames. In this way, the countertop is provided with even and secure support, which is crucial to avoid damage or imbalance.

A recommendation is to consult directly with your stonemason about which reinforcement options they can offer.

Conclusion

By following these guidelines and adhering to the recommended measurements, you can create a countertop with an overhang that is both stylish and safe, while ensuring long-lasting durability.