Need Doing vs. Need To Do
Need + to-infinitive normally identifies an action the subject is required to perform. Need + -ing can instead give the thing needing attention a passive interpretation, so the two constructions are not interchangeable.
Use “need to do” when the subject must perform an action. “Need doing” is a different, chiefly British passive-meaning pattern such as “the room needs cleaning,” meaning it needs to be cleaned.
Key details
Further guidance
Boundary
Do not read the -ing noun phrase as a simple stylistic substitute for the to-infinitive: “I need to clean the room” and “the room needs cleaning” assign different grammatical roles.
Construction
Cambridge documents need + to-infinitive for necessity and also documents needs doing / needs to be done for the passive-meaning construction.
Decision
Choose “need to do” for the person or thing that must act; use “need doing” only when the subject is the thing that requires the action.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- Word patterns: need — Cambridge Grammar (opens in a new tab)Cambridge Dictionary · Need + to-infinitive for necessity/requirement; complements and main-verb need patterns
- Need — Cambridge Essential British English Dictionary (opens in a new tab)Cambridge Dictionary · Documents needs doing and needs to be done as passive-meaning necessity patterns
- Verb patterns: verb + infinitive or verb + -ing? (opens in a new tab)Cambridge Dictionary · Verb-complement patterns, including verbs taking -ing, to-infinitive, or both with meaning differences