Bill of Quantities

The Leistungsverzeichnis - commonly abbreviated LV and translated as Bill of Quantities (BoQ) - is the heart of almost every German public tender. It describes item by item, with quantities, what services a bidder must deliver if awarded the contract. Bidders use the BoQ to calculate their offer, contracting authorities use it to compare bids in the Preisspiegel (bid comparison sheet), and the parties later use it as the basis for invoicing. Without a BoQ there is no objective price comparison - and without objective price comparison no legally sound award.

In the narrow sense, BoQ refers to the detailed performance specification with bill of quantities under § 7c EU VOB/A: the contracting authority defines every single sub-service, sets quantities and technical requirements, and the bidder only fills in prices. This is to be distinguished from the functional performance specification (§ 7b EU VOB/A): the authority describes only the desired outcome; the bidder designs the solution - including quantities and construction details. Classical detailed BoQs are the norm in standard building, civil works and routine supplies and services. Functional specifications are used for complex projects such as turnkey buildings, general planning or innovative IT solutions.

A typical BoQ is hierarchically structured. It opens with preliminary notes covering site conditions, contract terms, health and safety, invoicing and special requirements. Then come titles and subtitles, which group the trades (e.g. earthworks, masonry, screed). Within the titles sit the items, numbered by an ordering number (OZ) following a fixed scheme. Each item contains:

• Item number (e.g. 01.02.030): hierarchical by lot, title, item
• Short text and optionally long text with the technical description
• Quantity and unit (m, m², m³, piece, hour, lump sum)
• Unit price (EP) - entered by the bidder
• Total price (GP) = quantity x unit price, calculated automatically
• optionally item type: standard, contingent, on-demand, alternative

In supply and service contracts, price sheets or service tables are often used instead of a classical BoQ - but the structure remains the same: sub-service, quantity, unit, unit price, total. In construction, the BoQ is exchanged electronically through GAEB data exchange; it forms a central part of the tender documents in any public tender.

Requirements for the Bill of Quantities differ depending on whether the contract concerns construction works or supplies and services - and whether it is above or below the EU threshold.

Construction works (above threshold). The governing provision is § 7 EU VOB/A. § 7 (1) sets out the core principle: services must be described clearly and exhaustively, so that all bidders understand the description in the same way and can calculate their prices reliably without extensive preparatory work. Concrete obligations follow:

• Clarity: no contradictory, ambiguous or vague specifications
• Completeness: all price-relevant facts must be disclosed
• Product neutrality: no brand naming without the addition "or equivalent" (§ 7 EU (2))
• Risk allocation only within reasonable limits (risk distribution principle)

The specific form is set by § 7c EU VOB/A: detailed performance specification with BoQ - each sub-service itemised with quantities and description. § 7b EU VOB/A regulates the functional alternative.

Construction works (below threshold). The same substantive requirements apply, set out in § 7 VOB/A Section 1.

Supplies and services (above threshold). § 31 VgV requires a performance specification that precisely defines all requirements for material, properties, quantities, quality, environmental impact and conformity assessment. Again: product-neutral, unambiguous, complete. Instead of a classical construction BoQ, a price sheet with line items is often used.

Risk allocation. A common dispute: who bears the risk if quantities are inaccurately estimated? Under a detailed BoQ with unit prices the quantity risk lies with the contracting authority - over- and under-quantities are settled via § 2 (3) VOB/B. Under a lump-sum contract (Pauschalvertrag) the contractor bears the quantity risk within the limits of the agreed scope.

Consequences of a faulty BoQ. Gaps, contradictions or scope for interpretation typically trigger variation orders (see Nachtragsmanagement) or disputes during execution. From a procurement law perspective, an unclear BoQ can prompt a bidder query or a formal complaint - and in extreme cases the cancellation of the procedure.

A federal state's building department renovates a listed administrative building. Estimated contract value for the dry construction trade: EUR 380,000 net - below the EU threshold, so VOB/A Section 1 applies.

The architectural firm prepares the Bill of Quantities in GAEB DA XML format. Structure:

• Title 01: Preliminary notes - monument protection, construction phases, working hours, site access, hazardous-material suspicion (asbestos in older plasters)
• Title 02: Demolition - Item 02.001 demolition of partition walls 240 m², Item 02.002 disposal of debris 18 t
• Title 03: Drywall partitions - 14 items covering different wall types (F30, F60, F90), heights and claddings
• Title 04: Suspended ceilings - 6 items with acoustic and fire-protection requirements
• Title 05: Hourly works and contingent items

The BoQ contains 87 items totalling around 2,400 m² of wall area. A mid-sized drywall contractor in the region receives the match on the morning of publication through its Patterno-Hit profile (drywall, 100 km radius, contract value EUR 100k-600k).

Calculation. The GAEB file is imported directly into the iTWO calculation software. The Patterno-Bid calculation agent recognises standard items (e.g. plasterboard walls on metal substructure), proposes material and labour costs from previous projects and flags unusual items (heritage stucco details, hazardous-material suspicion) for manual review. The 87 items are priced in 90 minutes - without AI, 6-8 hours would be realistic.

Bidder query. Item 03.008 lacks a sound-insulation classification. The firm submits a written bidder query; the contracting authority's reply is published to all bidders and becomes a binding amendment to the BoQ.

Submission. The completed BoQ is returned as GAEB DA XML, automatically loaded into the Preisspiegel and compared with competing bids. The contract is awarded three weeks later.

Bills of Quantities are the number-one source of error in procurement - on both the authority and the bidder side. Six recurring pitfalls:

• Authority: Product-specific descriptions without "or equivalent". Naming a specific brand or manufacturer in an item without adding "or equivalent" violates § 7 EU (2) VOB/A and § 31 (6) VgV. Consequence: open to challenge in review proceedings, in the worst case cancellation of the procedure.
• Authority: Contradictions between drawings, preliminary notes and BoQ. If the drawing shows a different construction than the BoQ describes, or the preliminary notes regulate the construction sequence differently than the items, variation orders are inevitable. Best practice is a strict document hierarchy and a fully reconciled document set within the tender documents.
• Bidder: Empty unit prices. Leaving individual items unpriced risks exclusion for incomplete declaration. A unit price of EUR 0.00 is permitted only under very narrow conditions and is usually a red flag for a mixed calculation.
• Bidder: Speculative unit prices. Unusually high unit prices on suspected quantity overruns (or unusually low ones on under-quantities) often trigger a price-investigation procedure under § 16 EU VOB/A. Authorities increasingly identify such "mixed calculations" routinely in the bid comparison sheet.
• Bidder: Not returning the GAEB file. When a BoQ is provided as GAEB DA XML, bidders must return it in the same format - usually as data type D84 (offer submission). A PDF response does not satisfy the requirement and leads to exclusion.
• Both sides: Ignoring quantity errors. A bidder who notices obvious quantity errors should flag them via a bidder query rather than exploiting them. § 2 (3) VOB/B does provide for adjustments, but knowingly hiding incorrect quantities can give rise to damages claims.

Companies that consistently win German public contracts treat the BoQ as a strategic control instrument rather than a clerical exercise. Six recommendations from practice:

• Use the GAEB interface consistently. Never transcribe a BoQ manually. Import it directly in GAEB format (DA83 invitation) into the calculation software and return it as DA84 (offer). Saves days and avoids transcription errors.
• Categorise items cleanly. On the first pass, sort BoQ items into three groups: (1) standard items with known reference values, (2) special items requiring research, (3) items with unclear requirements to be clarified via a bidder query.
• Document calculation rationale. Keep notes for each item on quantity derivation, material costs, labour hours, subcontractor offers and markup logic. This saves time on later variation claims and protects you during price investigations under § 16d EU VOB/A.
• Submit bidder queries in time. Clarify any ambiguities at least 7-10 days before the submission deadline. Late queries often go unanswered because the authority must observe its own response windows.
• Price contingent items carefully. Contingent and on-demand items are often weighted separately in the price comparison sheet. A deliberately market-realistic - not aggressive - price on these items protects against scoring distortions.
• Scan the market before pricing. Patterno-Hit shows all current public tenders with Bills of Quantities filtered by trade, region and volume. This builds a reliable data basis for realistic unit prices and a clear picture of comparable tenders in the market.