zena.ch exists to make fewer, better decisions—faster—before money is committed. We cut through complexity by reducing every plot to the essential facts that matter: what is allowed, what it will cost, and what can break the plan. We build simple, robust systems that are hard to kill—designed to last, easy to run, and easy to exit.
We prove what the law actually allows, using real documents and real limits—not optimism. We separate what is fixed from what can be negotiated, so you never pay for a legal illusion. This removes the single biggest source of expensive surprises.
We reduce the project to one clear, repeatable building logic that stays stable under pressure. Simple systems survive contractors, value engineering, and future changes better than clever designs. You get a plan that remains buildable even when reality gets messy.
We design for the years after construction, when costs and problems usually start. Fewer parts, fewer weak points, and simple servicing protect value over time. This is how an asset stays “first-class” in real ownership.
If you can’t explain how a place works, you can’t run it or rent it smoothly. We check access, circulation, parking, service zones, utilities, waste, and phasing early, so operations stay simple. That reduces friction, complaints, and ongoing cost.
You receive a clear, line-by-line cost model tied to the proposed system, including fees, VAT, and contingency. We show options with their impact on cost and time, so trade-offs are visible and decisions are clean. This makes budgeting, financing, and bidding far more predictable.
We test realistic paths: hold, build, phase, rent, or resell—based on stated assumptions. You see what drives returns, what drives risk, and where you can exit without getting trapped. This turns a plot into an asset you can manage like a business decision.

