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01 / Service

Preliminary Design Study

The Preliminary Design (APS) is a crucial stage in the design of a construction project, following the sketch phase. It specifies the technical and functional aspects, with preliminary plans detailing the layout of sp...

Sigma / 2026

01 / Scope

A reliable project begins with the right document.

The Preliminary Design (APS) is a crucial stage in the design of a construction project, following the sketch phase. It specifies the technical and functional aspects, with preliminary plans detailing the layout of spaces and construction solutions. The APS assesses technical and financial feasibility, including cost and time estimates, while taking into account site constraints and regulations. This document validates previous choices and prepares the necessary adjustments before moving on to the next phase (Detailed Design - APD).

02 / Typical outputs

  • Cadastral plan Required
  • Information note Required
  • Plans / Sketch Required
  • Ownership certificate Optional

Adjacent expertise