GermanyWhat are the rules about excavation near the boundary?
You cannot excavate near your property boundary if it removes essential lateral support from your neighbor’s land—unless you provide adequate alternative support.
What the Law Says
German civil law strictly limits how deeply you may excavate near a shared property line to protect your neighbor’s land stability.
Under § 909 of the German Civil Code (BGB), you must not deepen your land in a way that causes your neighbor’s soil to lose its necessary lateral support — for example, by creating a steep drop-off or trench right at the boundary.
This rule applies even if the excavation is on your own land and even if you had no intention to harm your neighbor. The law prioritizes physical stability over landowner autonomy.
The only exception is if you install sufficient alternative support — such as retaining walls, sheet piling, or structural bracing — that fully replaces the natural support removed by excavation.
Statutory TextEin Grundstück darf nicht in der Weise vertieft werden, dass der Boden des Nachbargrundstücks die erforderliche Stütze verliert, es sei denn, dass für eine genügende anderweitige Befestigung gesorgt ist.
— BGB § 909 — German Civil Code
What Courts Have Said
German courts treat violations of § 909 as strict liability matters — meaning intent or negligence is irrelevant.
The Federal Court of Justice confirmed that a landowner who excavates near the boundary and thereby deprives the neighbor’s land of essential support is fully liable for resulting damage — even without fault or negligence.
What to Do
Before any excavation within ~2 meters of the boundary, consult a geotechnical engineer to assess support risks.
If excavation is unavoidable, install certified structural support approved by local building authorities.
Notify your neighbor in writing before starting work — this helps avoid disputes and may support good-faith defenses.
If your neighbor’s excavation threatens your land, immediately request written assurance of support measures — and seek an injunction if refused.
Sources
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Not legal advice. This article is general information based on publicly available sources, written for educational purposes. Laws change and individual situations vary. Consult a licensed attorney in your jurisdiction before acting on anything you read here. Last reviewed: June 2026.