General Contractor

A general contractor (GC) is a construction company that assumes responsibility for the entire works toward the public contracting authority. Unlike trade-lot awards, in which each trade is awarded separately, the authority signs only one contract under a GC model, with the general contractor. The GC performs part of the work with its own resources (typically the shell construction or a core trade) and subcontracts the remaining trades to subcontractors.

The model is widespread in private construction but is the exception in German public construction. The reason is § 97(4) GWB: contracts must generally be divided into partial and trade lots to protect small and medium-sized enterprises. A combined award to a GC is only permissible when economic or technical reasons require it, and those reasons must be documented in the procurement report.

Distinction from Related Terms

German construction practice knows several similar constructions that differ along two dimensions: how much does the company perform itself? And: is planning part of the contract?

• General contractor (GU): performs a substantial part itself, coordinates all trades, no planning
• General manager (GÜ): performs nothing itself, subcontracts everything, no planning
• Design-build contractor (TU): performs a part itself, coordinates all trades, includes planning
• Design-build manager (TÜ): performs nothing itself, coordinates all trades, includes planning
• Main contractor: umbrella term for any company in direct contract with the procurement office, even a specialist trade firm that wins a single lot is a main contractor
• Bidding consortium (ARGE): joint venture of multiple companies submitting one bid under joint and several liability, not a GC model but an equal partnership

Contractual Structure in Practice

A GC award creates a two-level contractual structure: at the top, the construction contract between the authority and the GC (usually under VOB/B); below, subcontracting agreements between the GC and its subcontractors. The authority has no direct contract with the subcontractors but, depending on the tender documents, retains a say in their selection and replacement.

For the GC this means: full responsibility, unified warranty, single interface, and a GC markup on the cost of subcontractor work, typically 8–15 %, covering coordination, risk and warranty effort.

For construction firms that regularly pursue GC tenders, market monitoring is demanding: combined awards appear across more than 180 procurement platforms, often under CPV code 45000000 (construction work). Patterno-HIT's AI search filters GC tenders specifically by contract value, region and works type, separated from pure trade lots.

GC awards in German public construction sit at the intersection of the authority's efficiency interest and the SME protection principle of procurement law. Several rules interact:

§ 97(4) GWB, principle of lot division. The default: contracts are to be split into partial lots (by quantity) and trade lots (by type or specialty). A combined award to a GC is only permissible when economic or technical reasons require it. The bar is high, case law of the procurement chambers and higher regional courts requires a concrete, case-specific justification in the procurement report. Generic arguments ("easier coordination") are insufficient.

§ 5 VOB/A / § 5 EU VOB/A, lot formation for construction work. Specific rule for construction: works from different crafts or trades are generally to be split into trade lots. The GC model is not excluded but requires explicit justification.

§ 36 VgV / § 8a EU VOB/A, subcontracts. The bidder must state in the offer which portions are to be subcontracted and, upon request, name the subcontractors. The authority may require certain critical tasks to be performed by the main contractor itself (self-execution requirement, § 47(5) VgV / § 6d EU VOB/A).

§ 47 VgV, reliance on third-party capabilities. If the GC relies on a third party's resources for suitability assessment (e.g., a subcontractor's references), it must prove that these resources are actually available, typically through a commitment declaration signed by that third party.

§ 132 GWB, contract modifications. A change of subcontractor during the contract term can constitute a material contract modification requiring a new procurement procedure. With simple subcontractor use the change is usually uncritical; with reliance on capabilities the authority's consent is required.

§§ 631 ff. BGB / VOB/B, works contract law. The contract between authority and GC is a works contract. In public construction, VOB/B is almost always agreed as contractual terms. The GC is liable for its subcontractors as for its own fault (§ 278 BGB, performance assistants), a central liability rule.

Wage compliance and minimum wage. The GC is liable as guarantor for compliance with the minimum wage and sector-specific tariffs by its subcontractors (§ 14 AEntG, § 13 MiLoG). Violations within the subcontracting chain can hit the GC personally, even if the violation was unknown.

A German federal state plans the new build of a high-security prison hospital with particularly complex security and medical technology. Estimated contract value: € 42 million net. After internal review, the procurement office decides on a GC award and documents three economic and technical reasons in the procurement report:

1. Interface complexity: high-security requirements, medical technology and building services interlock so tightly that separate trade-lot awards would significantly raise the risk of interface defects and schedule slippage.
2. Time pressure: the old building must be vacated in 24 months, trade-lot awards would extend construction time by an estimated 6 months.
3. Warranty: for this highly integrated installation, a single GC should be liable for the entire works to avoid disputes about responsibility gaps between trades.

The contract is tendered EU-wide in an open procedure. For a mid-sized construction firm specialising in shell and structural construction the workflow looks like this:

• Match qualification: the Patterno-HIT profile is set to: public GC contracts, value € 20–80 million, nationwide, special-purpose construction focus. The tender lands in the dashboard the morning of publication, flagged as a GC constellation.
• Suitability check: the authority requires three references for special-purpose construction > € 30 million in the last five years, pre-qualification via the PQ-Verein registry, minimum annual revenue of € 80 million and professional liability coverage of € 10 million.
• Reliance on capabilities: for security technology the bidder relies on a specialist subcontractor (§ 47 VgV) and submits its commitment declaration plus references.
• Subcontractor packages: 14 trade packages (electrical, MSR, security, medical, HVAC, roof, façade, fit-out) are prepared in parallel and sent to pre-qualified subcontractors. The Patterno-Bid subcontractor agent tracks response rates and price status.
• Award: six weeks after submission the bidder receives the preliminary information under § 134 GWB; after the 10 calendar-day standstill period the award follows.

Total effort on the bidder side up to submission: approximately 35 person-days, spread across calculation, subcontractor requests, suitability documents and concept design.

GC awards are legally more demanding than pure trade-lot awards, both for authorities and bidders. Six recurring pitfalls:

• GC award without sufficient justification. Authorities tender combined awards because "it is easier to coordinate" or "that's how we always do it". Such reasoning rarely survives a challenge, the procurement chamber can cancel the procedure. Required is a case-specific, documented balancing in the procurement report.
• Missing commitment declaration when relying on capabilities. When a GC relies on a subcontractor for suitability (§ 47 VgV), a mere assertion is insufficient. A binding commitment declaration must be submitted in which the subcontractor commits to actually providing the resources. Without it, exclusion of the bid is the consequence.
• Underestimating subcontractor disclosure obligations. Some tender documents require naming all subcontractors in the bid itself; others only upon request. A blanket statement like "subcontractors will be named at award" risks exclusion for incomplete bid.
• Ignoring the self-execution requirement. § 47(5) VgV allows authorities to reserve certain critical tasks for the main contractor. Overlooking such a clause and subcontracting critical work breaches the contract, with consequences up to termination.
• Minimum wage and wage compliance in the subcontractor chain. The GC is liable as guarantor for minimum wage violations by its subcontractors (§ 14 AEntG). Selecting subcontractors purely on price, without embedding compliance clauses in the subcontract, risks personal liability for back wages in the subcontractor chain, even years later.
• GC markup miscalculated. Younger construction firms underestimate the coordination effort of the GC model: site management, subcontractor steering, interface management, unified warranty across all trades. A markup below 8 % regularly leads to project losses.

Companies that regularly win public GC contracts treat the model as a discipline of its own, with dedicated processes, calculation rules and a reliable subcontractor pool. Six recommendations from practice:

• Maintain a subcontractor pool, don't improvise. A reliable roster of 5–10 qualified subcontractors per trade is the foundation of successful GC work. Annual evaluation by price, quality, schedule adherence and compliance, framework agreements rather than per-project renegotiation. An AI-driven subcontractor agent (as in Patterno-Bid for construction) significantly accelerates the subcontract award process.
• Document reliance on capabilities cleanly. Anyone relying on subcontractor references or capacities always attaches a complete commitment declaration with stamp and signature, plus the subcontractor's suitability evidence (trade register, professional liability, references). This avoids the most common cause of exclusion in GC awards.
• Anchor compliance clauses in the subcontract. Minimum wage, wage compliance, social security, sub-sub-control: explicitly embedded in the subcontract, with contractual penalty clauses, audit rights and termination right on breach. In dispute, you then have not only § 14 AEntG but also a contractual recourse claim.
• Price interface risk deliberately. The GC markup is not just margin, it reflects interface risk, schedule slippage by subcontractors and unified warranty across the entire works. Realistic range: 8–15 %, with higher figures for more complex projects.
• Monitor GC tenders selectively. Not every construction tender suits a GC model. Filter by contract value (typically from € 5 million), works type (special-purpose construction, high security, hospital) and indications of combined award. Patterno-HIT automatically detects the procurement model from the tender notice and surfaces only fitting GC matches in the dashboard.
• Industrialise calculation. For GC contracts with 10+ trades, manual calculation is slow and error-prone. AI-assisted calculation systems can ingest positions directly from the GAEB data exchange format and pre-populate them with master unit prices and current material costs, reducing the bid phase from weeks to days.