How long does my natural hair need to be to use clip-in hair extensions? Follow Shanece September 05, 2020 22:50 Updated Your hair should be 6-7 inches (between chin and shoulder length) to ensure a natural blend. Related articles What if I want a shorter/longer length? Which set is right for highlights/lowlights or ombre/balayage hair? How do I pick the right extensions for me? If I have short hair, what set should I pick? I have several curl patterns in my hair - which curl pattern should I choose? Comments 0 comments Article is closed for comments.