PresuBuild

PresuBuild is a technical construction budgeting tool built specifically for Spanish contractors and small construction companies — designed by a contractor, not a tech company. The problem it solves: Contractors in Spain have always been stuck between two bad options: complex software like Presto or Arquímedes — powerful but designed by engineers for engineers, with steep learning curves and high costs — or basic Word and Excel documents that can't track real margins or produce the BC3 format that architecture firms require. The result: contractors lose money without knowing why, spend days on budgets that should take hours, and often can't even respond to formal tender requests. What PresuBuild does: Describe a construction project in plain language → AI (Claude by Anthropic) generates the full budget structure: chapters, line items, and technical descriptions in seconds Import a PDF budget from an architecture firm → AI extracts chapters and line items automatically, no manual copying Full BC3/FIEBDC-3 compatibility — import and export to Presto and Arquímedes, the two dominant tools in Spain's construction sector Internal cost breakdown hidden from the client — contractors set their real costs (labour, materials, subcontractors, overheads, profit margin) and the client only sees the final price Real-time cost tracking during construction: attach supplier invoices, compare accepted subcontractor quotes vs. actual invoices received, AI flags discrepancies automatically Professional PDF output ready to deliver to the client, with technical descriptions, measurements, and legal terms included Adaptive learning: PresuBuild learns from each budget the contractor builds and improves its AI suggestions over time Current stage: Early access validation — free for a selected group of contractors providing honest feedback. Fully functional and being used on real construction projects. Long-term vision: PresuBuild is built to become the tool the construction sector builds for itself. Every registered user has access to a suggestion channel. Requests are reviewed automatically to identify the most common needs and prioritise development. The goal is a shared methodology built from the ground up by the people who use it every day — not imposed from above.