Construction Documentation: Legal Requirements in Germany (BGB §650n)

The Legal Basis: BGB §650n

Since January 2018, the German Civil Code (Bürgerliches Gesetzbuch) includes §650n, which directly addresses construction documentation obligations. This paragraph states:

> The contractor must, upon request by the client, provide documentation of the condition of the construction site or the work performed, in text form.

This means that any client can demand written documentation of progress at any time – and the contractor must be able to deliver it.

Who Is Responsible for Documentation?

Responsibility depends on the contract type and the parties involved:

Contractors (Auftragnehmer) - Must document on request (BGB §650n) - Under VOB/B contracts, documentation duties are more extensive and often contractually required from day one

Architects (Architekten) - Under HOAI service phase 8 (Objektüberwachung), architects have a professional duty to maintain a construction diary - Failure to document can lead to personal liability for undetected defects

Building Owners (Bauherren) - Not legally required to keep their own records, but strongly recommended - Independent documentation provides leverage in disputes with contractors

Site Managers (Bauleiter) - Daily documentation is a core part of the site manager role - Must record workforce, progress, weather, incidents, and deliveries

What Must Be Documented?

The law does not specify an exact format, but courts and industry standards expect:

1. Daily entries – Date, time, and a chronological record of events
2. Weather conditions – Temperature, precipitation, wind (affects work feasibility)
3. Trades and workers – Who was on site, how many people per trade
4. Work performed – What was done, where, and to what extent
5. Material deliveries – Type, quantity, supplier, and condition on arrival
6. Incidents and defects – Any problems, accidents, or deviations from plan
7. Photos with timestamps – Visual evidence of progress and issues
8. Instructions and decisions – Any verbal or written instructions given on site

Consequences of Poor Documentation

Inadequate or missing construction documentation can have serious consequences:

• Loss of claims – Without records, delay claims under VOB/B §6 are nearly impossible to prove
• Liability exposure – Architects and site managers can be held personally liable for defects they failed to document
• Payment disputes – Contractors may struggle to prove completed work for final invoicing
• Warranty issues – During the 5-year warranty period (BGB §634a), missing documentation weakens the client's position on defect claims
• Insurance complications – Construction insurance claims often require contemporaneous documentation

VOB/B vs. BGB Contracts

Aspect	BGB Contract	VOB/B Contract
Documentation duty	On request (§650n)	Typically from day one
Format	Text form sufficient	Often specified in contract
Daily diary required	Not explicitly	Usually contractually required
Acceptance protocol	Recommended	Mandatory (VOB/B §12)
Delay documentation	Burden on claimant	Detailed records expected

How Digital Tools Help With Compliance

Modern construction documentation tools like docubau make compliance significantly easier:

• Timestamped entries – Every message is automatically dated and timed
• Automatic weather data – No manual weather recording needed
• Photo integration – Images are embedded directly in reports with metadata
• Structured format – AI organizes free-text input into compliant report formats
• Instant availability – Reports can be shared with any party immediately via PDF
• Audit trail – All entries are stored with a complete change history

Instead of spending 30 minutes filling out paper forms, a simple WhatsApp message from the site creates a legally compliant record in minutes.

Try docubau free for 14 days →