About Aproplan LetsBuild
The site-quality app from La Hulpe, today part of Causeway.
Aproplan started in 2012 in La Hulpe near Brussels, founded by Thomas and Mathias Goubau. It grew into the mobile-first werf-app that Belgian and French aannemers use for snagging, opleveringspunten, drawings and quality control. In 2019 it merged with the Danish planning tool GenieBelt under the LetsBuild brand. In December 2025 the field-management product, now branded LetsBuild Aproplan, was acquired by the UK construction-software group Causeway Technologies, with more than 900 customers and active users across Belgium, France, the Netherlands, Luxembourg and a long list of other markets.
The product covers the part of the werf the back-office never sees on time: opleveringspunten logged with a photo on the plan, QHSE-checklists signed off per ploeg, defect-status per onderaannemer, drawing revisions and the werfrapport that comes out at the end of the day. Pulling Aproplan LetsBuild into a warehouse means those signals decide whether a werf hands over on the planned date. Open snag count per uitvoeringsfase, defect-clearance velocity per onderaannemer, checklist-completion per ploeg and oplevering-readiness per werf land next to the offer in the CRM, the bordereau in the ERP and the daily team availability in the planning tool. The werf that is going to miss its oplevering becomes visible vóór de werfvergadering, not at the eindcontrole.