VOB (German Construction Contract Procedures)

The VOB (Vergabe- und Vertragsordnung für Bauleistungen) is the common rulebook used by public authorities in Germany to tender, award and contractually execute construction works. It is issued by the German Construction Contract Committee (DVA), a body composed in equal parts of representatives from public authorities, the construction industry, and the chambers of architects and engineers. Unlike a classic statute, the VOB is therefore a consensus-based industry framework that only becomes legally binding either through reference in laws (budgetary law, VgV) or through inclusion in the construction contract.

The VOB is structured in three parts with clearly separated functions:

• VOB/A, rules for the procurement procedure (how a construction contract is awarded).
• VOB/B, general contract conditions for the execution phase (what applies once the contract is signed).
• VOB/C, general technical contract conditions with DIN standards for individual trades (how to build correctly from a technical perspective).

The currently binding edition is VOB 2019, amended over the past years through gazette publications (most recently for editorial and EU-law alignments). A new full edition is expected in the context of the German Public Procurement Reform.

The VOB is closely interlinked with other frameworks: it is lex specialis for construction works versus the general VgV, which only covers supply and service contracts. For construction contracts above EU thresholds, VOB/A Section 2 (EU paragraphs) applies; below the threshold, Section 1 applies.

VOB/A, procurement rules

VOB/A governs the competition for the construction contract:

• Section 1: National procurements below the EU thresholds, shorter deadlines, leaner procedures, supplemented by state-level procurement law.
• Section 2 (VOB/A-EU): Procurements above the EU thresholds with EU-wide publication on TED, longer minimum deadlines and strict legal protection via the public procurement tribunal.
• Section 3 (VOB/A-VS): Construction works in defence and security under the VSVgV.

Sections 1 and 2 cover procedure types (open, restricted, negotiated), deadlines, suitability requirements, evaluation and contract award.

VOB/B, contract conditions

VOB/B provides the rules of the game after contract signing: execution deadlines, notice of obstruction, acceptance, remuneration, hourly work, variation orders, contractual penalties, warranty and termination. In contrast to the pure BGB construction contract, VOB/B shortens the warranty period from five to four years but provides more detailed rules on variations (§ 2 VOB/B) and acceptance (§ 12 VOB/B). VOB/B only applies if validly included in the contract, which is almost always the case with public authorities.

VOB/C, technical standards

VOB/C contains the general technical contract conditions (ATV) as DIN standards for individual trades. They define how bills of quantities must be structured, which ancillary services are deemed included in the price, and how quantities are measured. Over 60 individual ATVs cover all relevant trades.

With Patterno, construction companies find the tenders where VOB/A applies, consolidated across more than 180 procurement portals.

The VOB has no direct statutory force, its binding effect is established in three ways:

1. Reference in procurement law. For construction contracts above the EU thresholds, § 2 EU VgV refers to VOB/A Section 2 as the applicable procurement rules. Below the threshold, budgetary law (§ 55 BHO, § 30 LHO, municipal procurement directives) obligates federal, state and local authorities to apply VOB/A Section 1. As a result, VOB/A is mandatory for almost any public construction contract in Germany.

2. Contractual inclusion. VOB/B and VOB/C become part of the contract through inclusion in the construction contract. Public authorities include them automatically via the tender documents; private clients must explicitly make the VOB/B available to their counterparty for valid inclusion. If VOB/B is only partially modified, the German Federal Court of Justice (BGH) has held that the entire VOB/B then falls under the BGB rules on standard terms (AGB), individual clauses may then be void.

3. Current edition: VOB 2019. The current consolidated edition is dated 2019. It has been amended editorially and to reflect EU law (notably the eForms Regulation (EU) 2019/1780 for EU-wide notices) through several gazette publications. The next full overhaul is expected in the context of the 2026 procurement reform.

Relationship with other frameworks:

• GWB Part 4 (§§ 97 et seq.): sets the general framework for procedures above the threshold (principles, legal protection). VOB/A-EU operationalises it for construction works.
• VgV: does not apply to construction works, but to supply and service contracts. § 2 VgV refers to VOB/A for construction.
• SektVO: construction works by sectoral contracting entities (water, energy, transport) follow the SektVO, not VOB/A.
• UVgO: applies to supply and service contracts below the threshold, not to construction. For construction below the threshold: VOB/A Section 1.
• BGB: §§ 650a et seq. BGB have regulated the statutory construction contract since 2018. If VOB/B is agreed, its provisions take precedence.

EU thresholds for construction contracts. The threshold that distinguishes Section 1 from Section 2 is the EU threshold for construction works: currently EUR 5,538,000 (2024/2025), adjusted every two years by EU delegated regulation. The threshold check is based on the total estimated value of the entire construction project, not on individual lots (see EU thresholds).

Legal protection. For procedures under VOB/A Section 2, bidders can apply to the public procurement tribunal; a timely challenge to the contracting authority is a prerequisite. Below the threshold, this specialised legal protection does not exist; bidders must rely on civil-law claims or state-level objection procedures.

A university hospital in Baden-Württemberg plans to build a new research facility with an estimated construction volume of EUR 38 million. The project is divided into 18 specialist lots, shell construction, roofing, windows and façade, HVAC, electrical installation, screed, drywall, flooring, painting, outdoor works, and more.

Which part of the VOB applies and when?

Procurement phase, VOB/A Section 2. The contract value far exceeds the EU threshold for construction works (EUR 5,538,000). The total project value is decisive: even if an individual lot (e.g. painting at EUR 280,000) is below the threshold, the entire procurement is subject to EU law, with the exception of the so-called 20% rule and the EUR 1 million de minimis rule, which allow small lots to be awarded under national law. The hospital publishes an EU-wide tender under VOB/A-EU on TED and on a German procurement portal such as DTVP or Staatsanzeiger.

Bill-of-quantities phase, VOB/C. The architects draft the bill of quantities for each trade based on the applicable ATV, DIN 18299 for general rules, DIN 18331 for concrete, DIN 18338 for roofing, DIN 18382 for low-voltage cabling, and so on. This ensures that all bidders price the work in the same technical language and that ancillary services are uniformly delimited.

Contract execution phase, VOB/B. After award, contracts are concluded on the basis of VOB/B. For the shell construction lot (EUR 8 million), the construction period is set at 14 months, with a contractual penalty (§ 11 VOB/B) for delay. During execution, unexpected ground conditions occur, the shell contractor files a notice of obstruction under § 6 VOB/B, documents the situation, and receives an extension of time. The additional cost is settled as a variation under § 2 (5) VOB/B. After completion, formal acceptance under § 12 VOB/B is held with a written protocol; from this point onwards, the four-year warranty period under § 13 (4) VOB/B begins.

Practical implication. A single construction project passes through all three parts of the VOB in sequence. Any construction company that wants to succeed in the German public sector must master all three, not only the procurement rules but also the contractual and technical rules that apply afterwards.

In practice, construction companies rarely fail because of the VOB itself, but because of how they handle it. The six most common pitfalls:

• Confusing VOB/A and VgV. The VgV does not apply to construction works. Bidders who apply VgV deadlines or procedural rules are starting from the wrong assumption. For construction, VOB/A applies, Section 1 below, Section 2 above the EU threshold.
• Forgetting the § 6 notice of obstruction. Without an immediate written notice of obstruction, the contractor generally loses any claim to an extension of time and to reimbursement of additional costs. An informal oral remark on site is not sufficient.
• Citing the wrong basis for variations. § 2 VOB/B carefully distinguishes between modified services (para. 5), additional services (para. 6), quantity overruns (para. 3) and lump-sum-specific rules (para. 7). Citing the wrong paragraph risks losing the claim or at least triggering lengthy disputes.
• Miscalculating the warranty period. Under VOB/B contracts the warranty is 4 years from acceptance (§ 13 (4) VOB/B), under a pure BGB contract it is 5 years. Companies that work with the standard BGB assumption underestimate the risk in years 4–5.
• One-sidedly modifying VOB/B clauses. If a public authority does not include VOB/B as a whole but modifies individual clauses, the special protection against the BGB standard-terms test (§§ 305 et seq. BGB) is lost. Individual clauses may then be void with an unclear fallback.
• Mispricing VOB/C ancillary services. The ATVs in VOB/C precisely define which services are deemed included in the unit price (ancillary services) and which must be priced separately (special services). Treating ancillary services as a variation will fail; forgetting to price special services means building at the contractor's own expense.

Professional construction companies treat the VOB as an operational manual, not as legal decoration. Six recommendations from practice:

• Run a three-part routine. For every new tender, systematically review all three parts: VOB/A (which procedure, which deadlines, which suitability requirements?), VOB/B (which contract clauses has the client modified?), VOB/C (which ATVs apply, which ancillary services must be priced in?). A checklist eliminates blind spots.
• Digitalise obstruction and variation management. Notices of obstruction, additional-cost notices and variation orders are documented in a central system, with timestamps, receipt confirmations and photo evidence. In a dispute, the quality of documentation decides the outcome.
• Use VOB/C actively during pricing. Don't reach for the ATVs only when a dispute arises, use them already at tender stage: which ancillary services must be priced in under DIN 18299 / DIN 18331 etc.? Which quantity-measurement rule applies? Doing this cleanly avoids both overpricing and undercutting.
• Threshold check on every project. Before submitting an offer, check whether VOB/A Section 1 or 2 applies, whether the contract value estimate is plausible, and whether lot splitting has triggered the 20%/de-minimis rule. Bidders who understand this know the procedural regime and review options better than the client.
• Keep the 2026 reform on the radar. The public procurement reform (Bundesrat approval in May 2026) will change value thresholds, direct-award flexibility and deadlines. A brief quarterly update for sales and pricing teams is enough to avoid working with outdated assumptions.
• AI-driven construction monitoring. Instead of manually scanning DTVP, Vergabe24, Staatsanzeiger and state-level portals every day, define a single search profile in Patterno Hit: trades, region, contract volume, procedure type. The AI understands the business and only delivers tenders where the correct VOB/A regime and your own suitability genuinely fit.