Works Contract

A public works contract (German: Bauauftrag) is a public contract whose subject matter is either the execution of construction works, or the simultaneous design and execution of such works. Alongside the supply contract and the service contract, it is one of the three basic categories of German public procurement law, and by volume, by far the largest. Federal, state and municipal authorities in Germany award works contracts worth well over €60 billion per year.

The legal definition is in § 103(3) GWB: A public works contract exists when a contract is concluded for the execution or the simultaneous design and execution of construction works, or for a structure that is the result of civil or building works and is intended to fulfil an economic or technical function. The definition also covers construction works that a third party carries out in line with the public authority's requirements.

In practice, works contracts cover a broad spectrum:

• Building construction: schools, hospitals, administrative buildings, housing, sports and cultural facilities
• Civil engineering: roads, bridges, tunnels, sewers, rail infrastructure, flood protection
• Interior fit-out: drywall, painting, flooring, tiling, screed, carpentry
• Building services (MEP): heating, ventilation, plumbing, electrical, lifts
• Modernisation and refurbishment: energy retrofits, hazardous materials remediation, conversions
• Demolition and dismantling: disassembly, disposal, removal of contaminated plant

Classification as a works contract does not depend on the contract's title but on the primary subject matter. If a new office building is procured including furniture, the classification depends on which share dominates in value. If the construction work is dominant, it is a works contract, even when furniture is delivered alongside. If, in contrast, an existing building is leased and only furnished, it is a supply contract.

Works vs. Supply vs. Service Contracts

Clean classification matters because it determines which procurement rules (VOB/A or VgV/UVgO) apply and which threshold is relevant. Rule of thumb:

• Works contract: construction, alteration, maintenance or removal of a structure, with or without materials supply
• Supply contract: purchase, lease, rental or hire-purchase of goods, even with installation, provided installation is only ancillary
• Service contract: any service that is neither works nor supply (e.g. cleaning, consulting, security)

Pure planning services (architectural and engineering services under HOAI) without execution are service contracts, not works contracts. Only when design and execution are tendered together (turnkey, design-and-build) does a works contract arise.

For companies aiming to win public works contracts, the German market is highly fragmented: tender notices appear on more than 180 e-procurement platforms, from the federal evergabe-online to state and municipal portals. Patterno-HIT's AI search centralises all current works contracts, filtered by region, trade and contract value.

The award of public works contracts in Germany is two-tiered: above the EU thresholds, the GWB cartel procurement law applies; below, national budgetary procurement law applies. In both regimes, VOB/A is the key rulebook for construction works.

§ 103(3) GWB defines the works contract and distinguishes it from supply and service contracts. Annex II of EU Directive 2014/24/EU (transposed in Annex II to § 1 VgV) lists exhaustively which activities count as construction works, the list follows the NACE classification and covers around 50 CPV areas in construction.

Above threshold (from 2026: €5,404,000 net):

• GWB §§ 97 et seq., principles, procedure types, suitability criteria, award rules
• VOB/A EU (Section 2), construction procurement regulation, EU part
• VgV, supplementing on specific aspects (communication, procedure rules)
• EU Directive 2014/24/EU, background law

Above this threshold, EU-wide publication on TED is mandatory; national publication alone is not enough. Violations may lead to the contract being set aside in a review procedure.

Below threshold (< €5,404,000 net): Here UVgO does not apply, instead, VOB/A Section 1 governs. Construction works are explicitly excluded from the scope of UVgO (§ 1(2) UVgO). Instead, the Federal Government and the Länder regulate award through their own procurement manuals, e.g. the Federal Construction Procurement Manual (VHB) and equivalent state manuals.

Procedure types. Works contracts use essentially the same procedures as other public contracts. Above threshold: open procedure, restricted procedure, negotiated procedure, competitive dialogue, innovation partnership. Below threshold, VOB/A uses: open invitation to tender, restricted invitation, negotiated procedure.

Construction contract law after award. Award creates a construction contract, typically governed by:

• VOB/B, general conditions for construction works (typical for public contracts)
• BGB §§ 650a et seq., statutory construction contract law since 2018
• HOAI, fee regulation for planning services

Warranty periods differ: 4 years under VOB/B, 5 years under BGB for structures.

A mid-sized city of 80,000 inhabitants is planning a new primary school worth €28 million gross, of which around €23 million net is construction works. The contract is well above the EU threshold of €5,404,000, EU-wide publication is mandatory.

The process for a regional mid-sized construction company:

1. Publication. The city publishes 14 individual trade lots on TED and a state portal: shell construction (€8 million), roofing (€1.2 million), windows (€1.8 million), MEP (€3.5 million), electrical (€2.2 million) and nine more trades. Each lot is awarded separately, classic trade lot division under § 5 VOB/A.
2. Hit qualification. The company has stored in its Patterno-Hit profile: trade shell construction, building construction focus, 80 km radius, contract value €500,000 to €10 million. On the morning of publication, the shell construction hit appears in the dashboard, the other 13 trades are filtered out automatically.
3. Suitability check. The city requires entry in the trade register, pre-qualification in the PQ-Verein registry, and three reference projects of comparable size from the last five years. The company uploads prepared suitability documents from an internal templates folder, preparation time about 90 minutes.
4. Bid pricing. The bill of quantities in GAEB format contains 1,247 items. Using Patterno-Bid's calculation agent, items are filled automatically: quantities, unit prices, material costs, labour shares, hundreds of items in seconds instead of hours in iTWO.
5. Submission. The encrypted bid is uploaded two days before the deadline. At the opening session under § 14 VOB/A, bids are opened electronically under the four-eyes principle.
6. Award. Six weeks later, the company receives the standstill notice under § 134 GWB, followed by the award after the ten-day standstill period.

Total bidder effort: around 18 person-days. Without AI-assisted pricing, 25–30 days would be realistic.

Works contracts are complex, six recurring mistakes either trigger exclusion or massive post-award disputes:

• Wrong classification works vs. supply. If a contract is incorrectly tendered as a supply contract when in fact construction is the dominant share, the wrong threshold applies (€215,000 instead of €5,404,000). The consequence: a national procedure must be reopened EU-wide, months of delay.
• Bundling without justification. § 97(4) GWB mandates trade lot division. A bundled award to a general contractor is only permissible if economic or technical reasons compel it, and those reasons must be documented in the procurement file. Without justification, the procedure can be overturned in a challenge.
• Incomplete bill of quantities. Gaps or inconsistencies in the bill of quantities inevitably lead to variation orders, construction delays and disputes. Experienced bidders spot this at bid stage and either price in risk margins or decline altogether.
• Wrongly documented reliance on third-party capacity. Smaller bidders relying on third-party capacities (§ 47 VgV / § 6d EU VOB/A) cannot do so by simple declaration. The contracting authority requires a binding commitment from the third party, missing this triggers exclusion.
• Late challenge of a flawed procedure. A bidder who spots a procedural error in a tender notice must raise the challenge immediately, at the latest within 10 calendar days of becoming aware (§ 160(3) GWB). Waiting forfeits legal protection.
• Underestimating bid validity and construction time. Construction firms sometimes calculate on current material and labour prices, forgetting that the bid validity period can run six months and the construction period a further 12 to 24 months. A price escalation clause is not automatic in VOB contracts, it must be actively negotiated.

Companies that consistently win public works contracts treat sales as an industrialised process, not an ad-hoc decision. Six recommendations from practice:

• Maintain a clean suitability folder. Trade register entry, pre-qualification, professional liability insurance, social security clearance certificates, three current references per trade: keep these in a central folder with semi-annual updates. This cuts preparation time per bid from days to hours.
• Choose lots strategically. Not every works contract fits your capacity. Define a clear sweet spot: contract value, region, trade, contract type (VOB/B vs. BGB). Taking everything wastes money on oversized or unprofitable lots.
• Use GAEB interfaces. Import bills of quantities directly in GAEB format into your pricing software. Manual transcription costs days and creates errors. AI-assisted pricing systems can even pre-fill typical items automatically.
• Price in construction time and material risk. For build periods over twelve months, calculate material and labour escalation, or negotiate a price escalation clause. Steel, copper, timber and energy-intensive products can swing 20–40% within a year.
• Engage subcontractors early. When parts of the works must be subcontracted, approach subcontractors early, ideally before bid submission. Late subcontract negotiations create price, quality and schedule risk.
• Monitor the market centrally. Instead of checking 20 procurement platforms daily, use AI-driven aggregation. Patterno-HIT scans more than 180 portals and delivers only those works contracts that match your trade, region and contract value, every morning in your inbox.