Structural engineers · Rotterdam · since 1998
Built on numbers.
Structures checked twice, drawn once. Bridges, towers and roofs for architects, builders and cities that want to sleep at night.
- Projects412
- Bridges37
- Years28
- Checked twice100%
Sheet 01 · Work
Lately on the board.
- Project 01Harbour footbridgePlaceRotterdamYear2025Scale1:200
- Project 02Timber tower, 14 floorsPlaceUtrechtYear2024Scale1:500
- Project 03Market hall roofPlaceGhentYear2023Scale1:100
- Project 04Stand for a football clubPlaceBredaYear2022Scale1:250
Sheet 02 · Services
What we work out.
Four kinds of work, all done by the same twenty engineers in one room by the harbour.
- 1
Structural design
From the first sketch with your architect to the drawings the builder works from.
- 2
Second checks
We check other engineers’ numbers before a council or a bank needs them.
- 3
Old buildings
New floors, new holes and new uses for buildings that were never meant to have them.
- 4
On site
An engineer on site every week while it goes up, with a report the same day.
Sheet 03 · Process
Checked twice, drawn once.
- 01
Survey
We measure what is there, or what will be.
- 02
Calculate
Every load, every beam, every joint.
- 03
Check
A second engineer redoes it from zero.
- 04
Draw
Only then, and only once.
- 05
Build
On site until the last bolt.
Sheet 04 · Detail
The joint is the job.
Beams are easy. Where two of them meet is where buildings fail, so every joint gets its own drawing, its own sum and its own check.
| Load | Sign | Value |
|---|---|---|
| Own weight | G | 4.20 kN/m² |
| People and furniture | Q | 2.50 kN/m² |
| Snow | S | 0.56 kN/m² |
| Wind, peak | W | 0.92 kN/m² |
| Design load | Ed | 10.12 kN/m² |
Sheet 05 · Office
Three partners, one table.
Anouk de Vries
Partner, bridges
Samir Haddad
Partner, timber and steel
Lotte Jansen
Partner, old buildings
Sheet 06 · Questions
Asked often.
When should we bring in an engineer?
As soon as there is a sketch. A beam moved early costs nothing; a beam moved on site costs a week.
Do you work with any architect?
Yes. About half our work comes through architects, the other half straight from owners and builders.
What does a second check cost?
Usually between three and eight percent of the design fee, fixed before we start.
Sheet 07 · Next
Send us the drawings.
A sketch on a napkin is fine. We reply within two working days with what we see and what it would cost to work out.