A substantial renovation in Geneva is not a stack of tradesmen's quotes to pile up. It is a project that involves permits, a qualified representative, a dozen trades and a schedule in which the slightest slippage spreads. Many owners discover, halfway through the works, that the real burden is not the cost of the work but the coordination time — calls, arbitration, chasing — that eats into their evenings. Setting the framework up front changes everything. Here are the essential markers, backed by official sources.
When is a building permit required?
In Geneva, most demolition, construction, conversion, renovation or change-of-use works require a building permit. Modifying the volume, the architecture, the external appearance, the internal layout or the destination of a building generally falls within this scope. Some minor interventions may be exempt, but the boundary is more subtle than it appears, and a misjudgement can freeze a site. The reliable starting point is the Applying for a building permit page and its legal bases and directives.
The professionally qualified representative: an unavoidable role
This is the point people often grasp too late. The direction of works subject to a permit must be provided by a representative entered in the register of professionally qualified representatives (MPQ), whose competences match the nature of the work — typically an architect or engineer. This representative is responsible for the file until the decision and remains responsible for the site to the administration until the official end of their mandate. In other words, for a project subject to a permit, you cannot do without a qualified professional: it is a legal requirement, not a comfort option.
What a client's project manager can, and cannot, do
There is a frequent confusion between the qualified representative and the client's project manager (AMO). The AMO represents you, protects your interests, coordinates the parties, monitors the budget and the schedule, and filters the decisions to be made. It is a valuable role — but it supplements the qualified representative, it never replaces them. Technical responsibility and the direction of works in the legal sense remain those of the registered architect or engineer. Confusing the two means risking the belief that your file is covered when it is not.
Works contracts: framing before you start
Each tradesman's intervention rests on a works contract within the meaning of the Code of Obligations: scope, price, deadlines, warranties. Clear quotes, written purchase orders and a documented acceptance of the work are not red tape; they are the only documents that protect you if a work has a defect or a deadline slips. The general framework is set out in the Code of Obligations.
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Site coordination, the heart of the matter
Once the permit is obtained and the representative in place, the daily life of the site plays out in orchestration: sequencing the trades so the plumber does not precede the mason, arbitrating the unexpected without blocking the whole, holding the budget against variations, managing nuisance towards the neighbourhood. The canton indeed recalls the responsibilities of running a site on its Managing the site page. It is this invisible work that separates a serene renovation from months of ordeal.
Anticipating deadlines and the neighbourhood
A building permit is processed within a timeframe that depends on the complexity of the file and any objections. For a renovation of a flat in a condominium, you must also reckon with the rules of the property division and, often, the assembly's agreement for the common areas. Overlooking these timeframes risks blocking tradesmen booked long in advance. The right reflex is to map, from the outset, the chain of permits and agreements required, then to set the works schedule against the most binding milestones — never the other way round.
Budget, variations and a contingency provision
A renovation without a variation is a rarity: a wall hiding a surprise, an unforeseen compliance upgrade, a material choice that evolves. The discipline consists in distinguishing the initial budget, validated trade by trade, from a reasonable contingency provision, and in having each variation approved in writing before execution. This is what avoids the silent drift where the final bill far exceeds the announced envelope, without any clear decision ever having been taken.
Keeping control without carrying the load
Our role is not to stand in for your architect: it is to hold the coordination in your place, interfacing with the qualified representative, the trades and the administration, with the same rigour a family office applies to your built assets. You decide; we carry the operational load and the tracking of deadlines. Let's discuss your situation.
The rules and procedures cited may change: the linked official page prevails, and we verified them on 2026-09-20.