A 1930s terraced house in Delft-Tanthof received a dormer at the front. The narrow plot width required precise dimensions that just fell within the permit-free boundaries. Within 4 weeks the dormer was in place, without a permit procedure.
Illustrative blueprint view · existing situation, dimension check for narrow plot, measured drawing and final result.
The property in Tanthof was part of a row of narrow terraced houses with a plot width of just 5.1 metres. The permit-free rules tie the maximum width of the dormer to two-thirds of the width of the roof surface. That left little margin. The owner still wanted as much light and usable space as possible in the attic, and was unsure whether the desired width was still just within the permit-free limits.
We measured the exact width of the roof surface and calculated the maximum permit-free width. By making a smart choice of window arrangement and placing two wide window sections in a narrow frame, we still brought in plenty of light. The setback of the dormer from the ridge just met the 0.5-metre requirement. The result: maximum dormer, no permit procedure required.
After installation, the attic room gained 5 m² of extra usable space with good headroom. Two large window frames provide daylight in the bedroom. Because the dormer was permit-free, the owner could engage a manufacturer immediately upon receipt of the drawings. The dormer was in place just 4 weeks after the commission. The owner did not have to wait a single moment for a municipal decision.
Key project details
What we delivered
Whether you live in Delft, Zuid-Holland or elsewhere in the Netherlands: we calculate the permit-free maxima, draw out the dormer and deliver the complete dossier. Since 2016, 800+ projects. A no-obligation quote within 1 working day.