Creating a stairwell in your floor is a major renovation that requires careful planning. Whether you want to open up an attic or install a new staircase, the question often arises: should a structural engineer be involved? This is a legitimate concern, as an improperly executed stairwell can jeopardize the stability of your home.

The decision of whether or not to engage a structural engineer depends on various factors, such as the type of floor, the existing supporting structure, and the size of the desired opening. In this article, we answer the most important questions regarding this choice so that you can make an informed decision.

When do you need a structural engineer for a stairwell?

You always need a structural engineer when the stairwell passes through load-bearing elements of your home, such as joists, reinforced concrete floors, or load-bearing walls. A structural engineer assesses whether the structure can accommodate the loss of material and advises on any necessary reinforcement measures.

Specific situations in which a structural engineer is indispensable include hollow-core concrete slab floors, hollow concrete floors, and situations where the stairwell is larger than 1,5 by 1,5 meters. Professional advice is also essential for older homes with unknown structural details. The structural engineer can determine which beams may be sawn through and how the remaining structure must be reinforced.

In some cases, the stairwell can be strategically positioned between joists, requiring less invasive measures. A structural engineer helps find the optimal location and ensures that all building codes are complied with.

What are the risks of a stairwell without structural advice?

Creating a stairwell without structural advice can lead to serious structural damage, such as floor deflection, cracks in walls, and in the worst case, the collapse of parts of the structure. This damage often develops gradually and only becomes visible after months or years.

In addition, you run the risk that your insurance will not pay out for damage caused by inexpertly executed work. Many insurers require proof that the work was carried out in accordance with applicable standards. Problems can also arise when selling your home if no structural engineer's advice is available for major renovations.

Financially, the costs of repairs after the fact can turn out to be many times higher than the initial investment in a structural engineer. It is therefore wise to seek sound advice beforehand, especially because concrete drilling can have irreversible consequences in load-bearing elements.

How do you know if your floor contains a load-bearing wall?

Load-bearing walls can be identified by their position in the building, their thickness, and the direction in which they run. Walls running parallel to the shortest side of a room are often load-bearing, as are walls located directly beneath other load-bearing walls on the floor above.

Visual indications include a wall thickness of more than 15 centimeters, the absence of doors or windows in the wall, and the presence of beams or girders resting on the wall. In the basement, you can often see how the foundation continues under load-bearing walls, whereas non-load-bearing partition walls are often placed on the floor.

In case of doubt, it is advisable to consult the original construction drawings or to have a structural engineer assess which walls are load-bearing. This prevents costly mistakes during drilling.

How much does a structural engineer cost for stairwell advice?

Structural advice for a stairwell typically costs between 500 and 1500 euros, depending on the complexity of the project and the scope of the required calculations. This amount usually includes a site visit, structural calculations, and a written advisory report.

For simple situations requiring only an assessment, structural engineers often charge an hourly rate of 75 to 125 euros. For more complex projects involving the design of reinforcement measures, costs can rise to 2000 euros or more. It is important to make clear agreements regarding the scope of the advice in advance.

Although this investment seems substantial, it does not outweigh the potential costs of structural damage or having to correct incorrectly executed work afterwards.

Can a concrete driller create a stairwell without a structural engineer?

A professional concrete driller can only create a stairwell without a structural engineer when non-load-bearing elements are involved and there is no doubt regarding the structural consequences. In all other cases, prior advice from a structural engineer is necessary for safe execution.

Experienced drilling specialists can assess whether a wall appears to be load-bearing and advise on the necessity of consulting a structural engineer. Thanks to their experience, they are aware of potential risks and can warn of situations where professional advice is necessary. However, the actual execution of drilling work in load-bearing elements is always carried out according to the specifications of a structural engineer.

Reliable concrete drilling specialists will advise you honestly when structural engineer advice is needed, even if this means a delay in the project. This transparency prevents problems later on and demonstrates professionalism.

How De Betonboorder helps with drilling a stairwell

We offer a complete service for creating stairwells, where safety and quality come first. Our experienced craftsmen carefully assess every situation and provide honest advice regarding the necessity of structural engineering advice. When working according to the structural engineer's specifications, we ensure:

Precision drills with diamond core drills for minimal vibration and low-dust operation.
Careful execution in accordance with all technical specifications
Tidy up and leave the workplace tidy
Transparent communication regarding potential risks and necessary preparation

Whether you need a simple stairwell in a wooden floor or a complex reinforced concrete project, we provide expert advice and execution. Contact us for a no-obligation assessment of your situation and discover how we can realize your stairwell project safely and professionally.

Do I need a structural engineer for a stairwell in the floor?