Structural calculations for a stair opening

What does this project require structurally?

When joists are cut, trimming beams must take over their loads. The floor material and opening position determine the options. Existing reinforcement or prestressing can severely limit alterations to concrete floors.

Which information helps with your enquiry?

• Opening position and dimensions
• Floor type and joist direction
• Reinforcement drawings, if available
• Proposed staircase and connections

You do not need to have everything ready. State which documents are available and what is still unknown. We first assess whether there is enough information to define the brief. A site survey or further investigation may be necessary.

What can your brief include?

• Calculations for the trimming structure within scope
• Coordination of supports
• Drawing of the structural alteration

The quotation records which elements will be calculated and drawn, the information used as a starting point and when the documents will be delivered. This makes the scope clear to you, your adviser and your contractor.

What is not automatically included?

Architectural drawings, ground investigations, archive research, site visits, supplier calculations, temporary support and construction supervision are included only when explicitly agreed. Materials and construction work are outside the calculation fee.

Permits and structural assessment

Check the procedure for your activity and location through the Dutch Omgevingsloket. A structural report substantiates the agreed elements; it does not determine whether the entire building proposal is permitted.

From information to final project documents

Once your enquiry is agreed, the design basis is recorded, calculations and drawings are prepared and internally checked. Your contractor receives the final documents with a revision reference. Any discrepancy in the existing situation or change to your plans must be reported before work on the affected element continues.