A fixed price is useful only when the scope behind it is clear. The contract needs to describe what is designed, produced, delivered, installed and finished — and which plot-specific works require separate confirmation.
Start with a complete specification
Room finishes, windows, engineering systems, sanitary preparation and external works should not hide behind broad labels. A specification allows both sides to verify the same result and makes proposed changes visible before they affect price or timing.
Changes need a written process
If the client changes area, materials or equipment after approval, the effect should be calculated and accepted before work continues. This protects the fixed base price while still allowing deliberate improvements. Informal site decisions are one of the main reasons traditional budgets become impossible to track.
Timing must have a defined start and finish
A ninety-day commitment needs named starting conditions: signed documents, confirmed specification, access to the plot and any required approvals. Handover also needs a clear definition. When milestones are explicit, responsibility for a delay can be established fairly.
Warranty periods cover different layers
LITHENZA provides ten years for the structure, five years for engineering systems and two years for finishes. These periods reflect the different lifecycles of the building components. The handover package should explain how to report an issue and what information is needed for service.
The strongest guarantee is not a slogan. It is a documented scope, a traceable handover and a clear person responsible for the result.