What is a Bill of Quantities / Specifications?
The bill of quantities (Leistungsverzeichnis, LV) is a central component of the tender documents that provides a detailed, structured description of all goods, services, or works to be procured. It serves as the definitive specification of what the contracting authority requires and forms the primary basis on which bidders calculate their prices and prepare their offers. In construction procurement, the bill of quantities itemizes individual work items with descriptions, quantities, and units of measurement. In service and supply procurement, it may take the form of a detailed specification or requirements catalog.
The bill of quantities must be drafted with sufficient clarity and detail to enable bidders to calculate their prices accurately without ambiguity. Under the principle of unambiguous specification (eindeutige Leistungsbeschreibung), the contracting authority must describe the required performance in a product-neutral manner, unless specific products are justified by the subject of the contract. Specifications can be formulated either descriptively (describing the required functions and outcomes) or through reference to standards and technical specifications.
A well-drafted bill of quantities is essential for a successful procurement. Ambiguous or incomplete specifications can lead to widely divergent bids that are difficult to compare, disputes during contract execution about what is included in the scope, and claims for additional compensation. Contracting authorities invest considerable effort in preparing the bill of quantities, often engaging specialized consultants or using standardized position catalogs (Standardleistungskataloge) as a foundation.
Why It Matters for Bidders
The bill of quantities is the most important document for bid preparation. Bidders must review each item carefully, understand the scope and technical requirements, and calculate their unit prices based on their actual cost structures. In construction procurement, the bill of quantities in GAEB format allows for efficient electronic pricing using specialized estimation software.
Bidders should scrutinize the bill of quantities for inconsistencies, missing items, or unrealistic quantities, as these can indicate errors that should be clarified through bidder questions before submission. Identifying such issues early protects the bidder from pricing risks and demonstrates professional diligence. Bidders should never make assumptions about unclear items but should always seek clarification from the contracting authority.
Legal Framework
Requirements for the bill of quantities and specifications are established in Section 31 VgV for above-threshold procurement and in the UVgO for below-threshold procurement. For construction works, VOB/A Section 7 contains detailed rules on drafting specifications. EU Directive 2014/24/EU Article 42 sets out the framework for technical specifications, including the preference for functional or performance-based descriptions over prescriptive specifications.