In Portuguese construction, payments are tied directly to physical progress, not the calendar. This principle prevents paying for work that hasn't been done. The process is formalized in the initial construction contract or the 'Contrato Promessa de Compra e Venda' (CPCV), which is the promissory sale and purchase agreement.

This framework establishes a clear, recurring cycle: the contractor performs work, measures it, and submits a request for payment. The developer then verifies the work on-site before releasing any funds. This milestone-based approach is fundamental to maintaining financial control throughout a project.

The key document that triggers a payment is the 'Auto de Medição' (Measurement Act). Think of it as a detailed, itemized invoice for completed work, not just a bill. Instead of saying "Foundation work: $50,000," it specifies the exact volume of concrete poured, the weight of rebar installed, and the square meters of formwork used.

The developer or their fiscal representative verifies the claims in the 'Auto de Medição' against the project's foundational financial document: the 'Mapa de Quantidades' (Bill of Quantities). This document, agreed upon in the contract, lists every single task and material for the project, with its unit price. The audit is simple: Does the work claimed on the measurement act match the reality on site and the prices in the bill of quantities? If everything checks out, the payment is authorized.

The Portuguese system includes another layer of financial protection for the developer: 'Retenção' (Retentions). From each approved payment, the developer withholds a percentage, typically 5% to 10%. This retained amount serves as a performance guarantee.

This money isn't a penalty; it’s a security deposit held in trust. The accumulated funds are released to the contractor after the final project handover is complete and any defects identified in the final inspection have been resolved. This practice is legally supported by the Portuguese 'Código Civil' (Civil Code), which governs contractual obligations.

While the milestone-based payment cycle is standard, the overall contract structure can vary. The most common is a standard construction contract where payments follow the 'Auto de Medição' process strictly.

An alternative is the 'Chave na Mão' (Key-in-Hand) contract. Here, a developer agrees on a single, fixed price for the entire project, from design to final delivery. While the total price is fixed, payments are still typically linked to the completion of major phases (e.g., 20% after foundation, 30% after structure and roof, etc.) rather than the granular detail of the 'Auto de Medição'. This approach offers budget certainty for the developer but provides them with less granular control over the construction process.

Let's check your understanding of these core concepts.

Understanding these mechanisms is the foundation for navigating construction projects in Portugal, ensuring that payments are fair, transparent, and directly tied to tangible progress.