Site Manager VOB (German Construction Contract Procedures) Hourly Rate for SMEs: Cost Range, Influencing Factors, and Calculation

The award of site management services under VOB/B (German Construction Contract Procedures, Part B) is governed by § 2 VOB/B, which regulates the remuneration claims for construction services and the associated ancillary services. For mid-sized businesses commissioning an external site manager, the hourly rate question is one of the first calculation variables. Market-standard hourly rates for qualified site managers in Germany range between €75 and €160 net per hour, depending on qualification, region, and project type. Additionally, ancillary costs for travel, equipment, and documentation work are frequently underestimated in the offer calculation.

This article explains which factors drive the hourly rate of an external site manager, how the remuneration structure under VOB/B and HOAI (Remuneration Scale for Architects and Engineers) is correctly calculated, what formalities must be observed when commissioning a site manager, and under what circumstances the Officer-as-a-Service model represents a more economical alternative to a classic individual commissioning arrangement for SMEs.

The remuneration of an external site manager depends on the legal relationship with the client and which regulatory framework applies. Two constellations are fundamentally to be distinguished.

Constellation 1: Site manager as contractor under VOB/B. Where a site manager is commissioned as a contractor within the meaning of the BGB (German Civil Code) and provides their service as a work service, remuneration is governed by the works contract law of the BGB in conjunction with VOB/B, provided the latter has been incorporated. § 2 VOB/B stipulates that the agreed remuneration applies and that changes to the service must be agreed in writing.

Constellation 2: Site manager under HOAI as a planning service. Where the site management service forms part of a more comprehensive planning service, HOAI (Remuneration Scale for Architects and Engineers) applies. HOAI assigns on-site construction supervision to service phase 8 (object supervision) and allocates 32% of the total fee to this. For individual SME projects, the HOAI calculation is often less favourable than the hourly rate model, since the total fee is tied to the eligible costs of the structure.

For smaller construction projects and for commissioning a standalone site manager without planning services, the hourly fee is the more practical remuneration form. More on the formal requirements for the site manager appointment is available on the CIVAC role page for the site manager.

The hourly rates of external site managers vary considerably by qualification, experience, region, and project type. The following ranges are market-standard for German SMEs (as at 2025, net excluding VAT).

Civil engineer / architect with site management experience (5+ years): €95 to €135/hr. This group covers the standard case for commercial new builds, office buildings, and production halls.

Construction technician / master craftsman with site management authorisation under LBO: €75 to €100/hr. Suitable for smaller construction projects without particular complexity.

Specialist construction engineer (industrial construction, pharmaceutical GMP, cleanrooms): €140 to €160/hr or more. Projects with special technical requirements or regulatory obligations (e.g. under FDA, EU GMP) require specialist site managers.

Ancillary costs must be factored into the calculation in addition to these hourly rates: travel costs under § 670 BGB or JVEG rates, accommodation for projects away from home, and documentation effort for daily construction reports, acceptance records, and warranty documentation. The latter is often calculated by independent site managers at 10 to 15% of the hourly effort and should be transparently itemised in the contract.

Seven factors have the greatest influence on the hourly rate of an external site manager.

1. Qualification and LBO authorisation. Not every civil engineer may act as responsible site manager. The state building codes (LBO) prescribe qualification-dependent site management authorisation. Anyone wishing to act as site manager in Bavaria or North Rhine-Westphalia must fulfil the respective LBO requirements. Qualified site managers with multiple LBO authorisations command higher rates.

2. Project risk and liability scope. For projects with elevated liability risk (e.g. listed building fabric, hazardous substance risks, tight adjoining development), site managers charge risk premiums. The personal liability of the site manager under § 14 MBO and the LBOs legally justifies this premium.

3. Regional wage differences. In Munich, Frankfurt, and Hamburg, market prices for site managers are 15 to 25% above prices in structurally weaker regions.

4. Market availability. Experienced site managers are scarce in Germany. For short-notice requirements – where a site manager is needed quickly for a running project – hourly rates rise through market premiums.

5. Form of commissioning. A freelancer charges higher hourly rates than a site manager from a GmbH, since the freelancer does not receive social security contributions from the client but bears their own risk.

Three remuneration models are available when commissioning a site manager, each generating different incentive structures and calculation risks.

Hourly billing model: The site manager invoices actual hours worked. This is flexible but creates an open cost risk for the client. Under § 15 VOB/B, time-and-materials work is only remunerable where it was agreed in advance and the contractor presents time sheets confirmed by the client or their representative.

Lump-sum fee: A lump sum may be agreed for clearly delineated site management services. The risk here lies with the contractor: if the construction site runs longer than planned, their effective hourly remuneration decreases. For the client, the lump sum provides planning certainty.

Unit prices: For projects with quantity risk, service units (e.g. site inspections, acceptances) are remunerated at unit prices. This model is less common for site management but finds application where supervision services are clearly structured.

Regardless of the remuneration model, § 2(5) VOB/B applies: changes to the construction design or other instructions from the client that alter the basis for the price of a service provided for in the contract give rise to a claim for new remuneration. Contract changes must be agreed in writing before the changed service is delivered.

The site manager appointment is a formal act under the state building codes (LBO). It is made in writing and must be notified to the competent building authority where the respective LBO so requires. In Bavaria (Art. 59, 60 BayBO), in North Rhine-Westphalia (§ 59 BauO NRW 2018), and in other federal states with comparable provisions, the designation of the responsible site manager forms part of the building documents.

The appointment gives rise to a personal responsibility of the site manager for the proper execution of the construction project. They are personally liable for violations of the building permit, for compliance with technical standards (DIN, VOB/C), and for occupational health and safety requirements on the construction site. This personal liability is the legal reason why site managers must be formally appointed and cannot be replaced by informal arrangements.

The letter of appointment must contain the name, qualification, scope of tasks, and project description. It must be retained for the life of the project and beyond, as it serves as evidence in the event of warranty disputes or regulatory checks. Letter of appointment: signed, filed, demonstrable. The CIVAC Officer-as-a-Service model issues this letter in a standardised manner and stores it in an audit-proof manner in the workspace.

A realistic cost calculation for an external site manager on a typical SME construction project (e.g. extension of a production hall, 800 sqm, construction period 9 months) looks as follows.

Assumptions: Civil engineer site manager at €115/hr net; two site inspections per week of 3 hours each plus travel time and pre/post-preparation time of 2 hours; monthly documentation effort of 4 hours.

Calculation per month: Inspections: 2 × 5 hrs × 4 weeks = 40 hours. Documentation: 4 hours. Total: 44 hours × €115 = €5,060/month net.

Total costs over 9 months: 9 × €5,060 = €45,540 net. Travel costs (approx. 200 km/week × €0.45/km = €90/week = €3,240) and special services for acceptances and deficiency inspections (approx. €3,000 as a lump sum) are added. Total framework: approximately €51,780 net.

This calculation is a reference figure. Actual costs vary considerably depending on construction progress, complexity, and problems that arise. For project managers, monthly reporting of hourly effort is recommended in order to identify cost variances early. The CIVAC workspace contains task and reporting functions that the site manager can use directly.

Missing or unclear remuneration agreements are a frequent cause of disputes in site manager contracts. Three risk scenarios arise regularly in practice.

Risk 1: Hourly effort without a basis. Where no remuneration model has been agreed and the site manager invoices hours that the client did not anticipate, a dispute arises over the reasonableness of the effort. § 632 BGB in this case provides for the customary fee, which leaves considerable room for interpretation.

Risk 2: Variation order for changed services. Construction projects change. If replanning, regulatory requirements, or delivery delays lead to a higher site management effort, the site manager has a claim to supplementary remuneration under § 2(5) VOB/B. Clients who do not wish to conclude variation agreements risk disputes over the reasonableness of the increased costs.

Risk 3: Dual commissioning. If both the general contractor and the client each appoint a site manager without clearly governing the demarcation of tasks, coordination problems and duplicate costs arise. The regulatory building permit generally names a single responsible site manager. An informal parallel structure is problematic under building law.

Professional site manager contracts govern the remuneration model, scope of tasks, timesheet obligation, demarcation from variation services, and communication obligations towards authorities. The CIVAC site manager officer contract contains these elements in a standardised form.

For mid-sized businesses that only occasionally undertake construction projects, the question arises of whether a classic individual contract with a freelance site manager or a structured Officer-as-a-Service model is more economical.

Classic individual commissioning requires: tender or market research (1 to 3 weeks), obtaining and comparing offers, contract negotiation and drafting, ongoing hourly controlling, and manual document filing. The time required on the client side is typically 20 to 40 hours before construction begins, plus ongoing administrative effort.

The Officer-as-a-Service model, by contrast, delivers: a pre-qualified site manager from a certified network, standard contract and letter of appointment within two working days, ongoing documentation in the CIVAC workspace, a reporting line directly to senior management, and no need for own contract drafting.

The financial difference in hourly rates is often smaller than expected in this comparison: the administrative effort of individual commissioning consumes internal resources that in turn generate opportunity costs. For projects with up to approximately 12 months of site management, the Officer-as-a-Service model is in many cases comparable or cheaper, when the full cost path is considered.

Calculating site manager costs under VOB is not an isolated line item but part of a holistic risk picture: missing or unsuitable site management costs, in the event of a claim, many times more than the saved site management fee. Regulatory construction site shutdowns, warranty disputes, and personal liability risks for managing directors are the real consequences of structurally unsecured site management.

Licence the CIVAC workspace for your internal site manager – or commission our external site manager through the Officer-as-a-Service model. CIVAC delivers contract, person, and letter of appointment within two working days. The site manager works from day one in the workspace: daily construction reports, site inspection records, acceptance documentation, and communication with authorities are stored in a structured manner and are accessible to senior management at any time.

The inspector calls, the evidence is ready. This applies to regulatory checks as much as to warranty disputes, where complete construction documentation can make the difference between a swift resolution and years of litigation.

Turn reading into action: write to info@civac.de and describe your construction project. CIVAC will identify the appropriate site manager and send you a draft contract and letter of appointment within two working days.