Deviz

Deviz is a term used mainly in construction and civil engineering to denote a detailed cost estimate for a project. The word is widely used in Romania and other Eastern European contexts and is often connected with the preparation of a budget, tender documents, and progress payments. It derives from the French word devis, meaning a quotation or estimate.

A deviz typically provides a line‑by‑line breakdown of planned works and materials, including quantities, unit prices, and line totals. It is organized by sections such as earthworks, foundations, structure, finishes, and installations, and may also include indirect costs, contingency allowances, taxes, and the overall project cost. The document serves as a financial blueprint that guides bidding, contract pricing, and cost control during execution.

There are generally two main forms of deviz: an initial or preliminary deviz used for bidding and project evaluation, and an executive or working deviz used to monitor, adjust, and justify costs during construction. Prices are derived from supplier quotes, historical data, or cost databases, and are updated as designs evolve or conditions change. Variations and change orders are typically reflected by amending the deviz.

In practice, the deviz is closely related to the concept of a bill of quantities (BoQ) and functions as a primary tool for budgeting, tendering, and payment certification. It supports transparency in pricing and provides a basis for assessing invoices, claims, and deviations from the planned budget.