The stages and costs of a house project: what to anticipate

A house project does not begin with a drawing, but with a series of analyses that establish what can actually be built on a given plot. Local planning regulations, expressed through the urbanism certificate, the general urban plan and, where applicable, a zonal urban plan, define the permitted height, the site coverage ratio and the setbacks from boundaries. Understanding these constraints before shaping the brief is the step that avoids the most expensive corrections later on.

The design process usually unfolds in stages: context and urbanism analysis, defining the brief together with the client, the architectural concept, the documentation for the building permit, the technical project with execution details, and then assistance during the works. Each stage has its own deliverables and a distinct role, while architecture, structure and building services are conceived in an integrated way so that the solution is coherent and viable both technically and economically.

The design fee is most often tied to the complexity of the investment and the built area, and it is only one part of the total budget. To it are added the fees for approvals and the permit, the mandatory specialist studies, such as the geotechnical survey and the topographic survey, and, of course, the actual cost of construction. Looking only at the price of the design, in isolation from these components, gives an incomplete picture of the investment.

Construction cost depends on factors decided during the concept phase: the building height, the structural spans, the complexity of the massing, the finishes chosen and the level of energy performance. Decisions made early, while the plan is still on paper, have the greatest effect on the final budget. This is where a well-coordinated project proves its worth, not through apparent savings, but through optimised solutions that reduce surprises on site.

The practical recommendation is to set aside a contingency margin and to keep a constant dialogue with the design team throughout. A clear brief, a realistic schedule and decisions taken at the right moment turn a process that seems complicated into a predictable one, in which each stage naturally prepares the next.