A 1930s terraced house in Haarlem-Oost had the interior wall between the hallway and living room removed. We produced the structural calculation for the HEA beam and the permit for the technical building activity.
Illustrative blueprint view · situation before, sketch with steel beam, 3D impression and the delivered result.
The 1930s terraced house in Haarlem-Oost had a typical layout: a narrow hallway of approximately 1.5 m wide, fully closed off from the living room by a load-bearing internal wall. The living room therefore felt small and dark. The owners wanted to merge the hallway and living room into one space. The internal wall turned out to be structural: it carried the upper floor above the hallway and was included in the load transfer of the roof.
We mapped the load paths of the roof and upper floor. An HEA 160 beam spanning the full width of the hallway takes over the vertical forces from the removed wall. The bearings in the load-bearing external walls were calculated for the bending moment and support reactions in accordance with NEN 6770. Because the removed wall was load-bearing, a permit for the technical building activity was required; we handled that application. We delivered the structural calculation as a PDF for the contractor and the housing association.
The property now has an open hallway-living room with an unobstructed view from the front door through to the garden doors at the rear. The HEA beam has been integrated into the ceiling and fully concealed. The housing association gave its approval after receiving the structural calculation.
Key project details
What we delivered
We needed drawings quickly for our wall opening in Haarlem. Tekenpunt handled this fantastically. The environmental permit went through first time.
Wall openingA permit-ready drawing for a wall opening starts from €599 incl. VAT at Tekenpunt. The exact price depends on the size and complexity; you get a fixed price upfront, with no surprise extras afterwards. Request a no-obligation quote.
That depends on the type of intervention and the rules of the municipality of Haarlem. We check the aesthetic review policy and the zoning plan in advance, so you know where you stand and your plan typically passes the review in one go.
We plan the construction drawing by arrangement; rush is available for a surcharge. The permit procedure itself takes eight weeks for a regular application (Omgevingswet).
Whether you live in Haarlem, Noord-Holland or elsewhere in the Netherlands: we handle design and structural calculation from A to Z. Since 2016, 930 projects. Request a no-obligation quote.