Causative with lassen in German

Overview

The verb lassen is one of the most versatile verbs in German, and its causative use — expressing that you have something done by someone else or that you allow something to happen — is an essential B2-level topic. When you say Ich lasse mir die Haare schneiden (I'm having my hair cut), you are using lassen causatively: someone else performs the action on your behalf.

This construction covers two distinct meanings. First, the "having something done" meaning: Er lässt das Auto reparieren (He's having the car repaired — by a mechanic). Second, the "letting/allowing" meaning: Lass mich dir helfen (Let me help you). Both uses follow the same grammatical pattern — lassen + infinitive — but the context determines whether you mean "have done" or "allow."

Understanding lassen enriches your German enormously because it is deeply embedded in daily life. From getting a haircut to ordering a delivery, from asking permission to giving instructions, lassen is everywhere.

How It Works

Structure: conjugated form of lassen + infinitive (at end of clause)

Conjugation of lassen (present tense)

Person	Form
ich	lasse
du	lässt
er/sie/es	lässt
wir	lassen
ihr	lasst
sie/Sie	lassen

Two main meanings

Meaning	Pattern	Example	Translation
Have sth. done	subject + lassen + (dative) + object + infinitive	Ich lasse mir die Haare schneiden.	I'm having my hair cut.
Allow/let	subject + lassen + accusative person + infinitive	Lass mich helfen.	Let me help.

Tense formation

Tense	Example	Translation
Present	Ich lasse das Auto reparieren.	I'm having the car repaired.
Perfekt	Ich habe das Auto reparieren lassen.	I had the car repaired.
Präteritum	Ich ließ das Auto reparieren.	I had the car repaired.

Important: In the Perfekt, lassen uses the infinitive form (lassen) instead of the past participle (gelassen) when combined with another infinitive. This is called the "double infinitive" construction: Ich habe es machen lassen (not gelassen).

Reflexive lassen: sich lassen = "can be done"

German	English	Meaning
Das lässt sich machen.	That can be done.	Possibility
Das lässt sich nicht erklären.	That can't be explained.	Impossibility

Examples in Context

German	English	Note
Ich lasse mir die Haare schneiden.	I'm having my hair cut.	Causative with dative
Er lässt das Auto reparieren.	He's having the car repaired.	Having a service done
Lass mich dir helfen.	Let me help you.	Permission/request
Sie hat sich ein Kleid nähen lassen.	She had a dress made.	Perfekt with double infinitive
Wir lassen uns Pizza liefern.	We're having pizza delivered.	Common everyday use
Lass das!	Stop that! / Leave it!	Command
Er ließ mich nicht ausreden.	He didn't let me finish speaking.	Past — allowing
Können Sie mich bitte durch lassen?	Can you please let me through?	Request
Das Ergebnis lässt sich sehen.	The result is impressive. (lit. "lets itself be seen")	Idiomatic expression
Ich habe mir eine neue Küche einbauen lassen.	I had a new kitchen installed.	Home improvement
Lass uns gehen!	Let's go!	Suggestion (very common)

Common Mistakes

Using gelassen instead of lassen in Perfekt with infinitive

• Wrong: Ich habe das Auto reparieren gelassen.
• Right: Ich habe das Auto reparieren lassen.
• Why: When lassen is combined with another infinitive in the Perfekt, it stays in infinitive form (double infinitive), not past participle.

Forgetting the dative for "having something done to oneself"

• Wrong: Ich lasse die Haare schneiden. (ambiguous — whose hair?)
• Right: Ich lasse mir die Haare schneiden.
• Why: The dative reflexive pronoun (mir) clarifies that the action is done to/for you. Without it, the sentence could mean you are having someone else's hair cut.

Confusing lassen with verlassen

• Wrong: Ich verlasse das Auto reparieren. (nonsensical)
• Right: Ich lasse das Auto reparieren.
• Why: Verlassen means "to leave" or "to abandon." Only lassen (without prefix) has the causative meaning.

Misplacing the infinitive

• Wrong: Ich lasse schneiden mir die Haare.
• Right: Ich lasse mir die Haare schneiden.
• Why: The infinitive goes to the end of the clause, following standard German word order.

Usage Notes

The causative lassen is extremely common in everyday German. Germans use it for all kinds of services: sich die Haare schneiden lassen (get a haircut), das Auto reparieren lassen (have the car repaired), sich etwas liefern lassen (have something delivered), ein Haus bauen lassen (have a house built). It is the standard way to express that you commission someone to do something.

The "allow/let" meaning is equally frequent. Lass mich mal sehen (Let me see), Lass uns anfangen (Let's begin), and Lass das! (Stop that!) are phrases you will hear daily.

The reflexive construction sich lassen + infinitive serves as an elegant alternative to the passive with können: Das lässt sich machen (That can be done) is more conversational than Das kann gemacht werden. This use is very common in spoken German.

In subordinate clauses with the Perfekt, the word order can feel unusual because of the double infinitive: ..., weil ich das Auto habe reparieren lassen (the conjugated habe moves before the two infinitives). This is grammatically correct, though some speakers avoid the construction by using the Präteritum instead: ..., weil ich das Auto reparieren ließ.

Practice Tips

1. List five services you regularly use (haircut, car repair, delivery, cleaning, etc.) and describe each one using lassen: Ich lasse mir einmal im Monat die Haare schneiden. Ich lasse mir freitags immer Pizza liefern.
2. Practice the Perfekt double infinitive construction, which is tricky but essential: convert your present-tense lassen sentences to Perfekt: Ich habe mir die Haare schneiden lassen. Ich habe das Auto reparieren lassen.
3. Use sich lassen to describe possibilities around you: Die Tür lässt sich nicht öffnen. Das Problem lässt sich lösen. Das Wetter lässt sich nicht ändern.

Related Concepts

• Regular Verbs (Present) — basic verb conjugation that lassen builds upon