The child starts puberty if one of the three signs are present: either he starts ejaculating with desires, or he grows pubic hair on his armpits or private parts or when he reaches the age of fifteen years old.

Parenting Fiqh: The Times when Children Can Go to Their Parents Room and Times When they Need to Seek Permission Before Doing So

Posted: 08 May 2018 07:37 AM PDT

Question: At what age should the child start to seek permission before going to his parents 

room?

Answer: This has been explained by Allaah in Surah an-Noor, where He Stated:

“O you who believe! Let your legal slaves and slave-girls, and those among you who have not come to the age of puberty ask your permission (before they come to your presence) on three occasions; before Fajr (morning) prayer, and while you put off your clothes for the noonday (rest), and after the 'Isha' (late-night) prayer. (These) three times are of privacy for you, other than these times there is no sin on you or on them to move about, attending (helping) you each other. Thus Allah makes clear the Ayat (the Verses of this Qur'an, showing proofs for the legal aspects of permission  for visits, etc.) to you. And Allah is All-Knowing, All-Wise.” [an-Noor 24:58]

After that, He Stated:

And when the children among you come to puberty, then let them (also) ask for permission, as those senior to them (in age). Thus Allah makes clear His Ayat (Commandments and legal obligations) for you. And Allah is All-Knowing, All-Wise. [an-Noor 24:59]

So before the age of puberty, they should seek permission the three aforementioned times 

however after they started or passed puberty, then they should seek permission to enter, at 

all times.

The child starts puberty if one of the three signs are present: either he starts ejaculating with 

desires, or he grows pubic hair on his armpits or private parts or when he reaches the age of fifteen years old. If these are present, then he must seek permission before entering at any time of the day. This is the case upon entering upon his mother who may be in an indecent state for him to see her in, or it may be his wife, or his sister, the point is that he should ask for permission before entering so that these women will not be surprised when he enters so that they can be descent for him when he enters. As for children or who have not yet started puberty, then they only 

need to seek permission during the three times mentioned above.

 

http://www.binbaz.org.sa/mat/9631

الوقت الذي يستأذن فيه الأطفال عند الدخول على والديهم

متى يبدأ الأطفال بالاستئذان على والديهم؟

هذا بينه الله في سورة النور، في قوله -جل وعلا-: يَا أَيُّهَا الَّذِينَ آمَنُوا لِيَسْتَأْذِنكُمُ الَّذِينَ مَلَكَتْ أَيْمَانُكُمْ وَالَّذِينَ لَمْ يَبْلُغُوا الْحُلُمَ مِنكُمْ ثَلَاثَ مَرَّاتٍ مِن قَبْلِ صَلَاةِ الْفَجْرِ وَحِينَ تَضَعُونَ ثِيَابَكُم مِّنَ الظَّهِيرَةِ وَمِن بَعْدِ صَلَاةِ الْعِشَاء ثَلَاثُ عَوْرَاتٍ لَّكُمْ لَيْسَ عَلَيْكُمْ وَلَا عَلَيْهِمْ جُنَاحٌ بَعْدَهُنَّ طَوَّافُونَ عَلَيْكُم بَعْضُكُمْ عَلَى بَعْضٍ[النــور: 58]، ثم قال بعدها: وَإِذَا بَلَغَ الْأَطْفَالُ مِنْكُمُ الْحُلُمَ فَلْيَسْتَأْذِنُوا كَمَا اسْتَأْذَنَ الَّذِينَ مِنْ قَبْلِهِمْ[النور: 59]، فهم قبل بلوغ الحلم يستأذنوا في الأوقات الثلاثة، أما بعد بلوغ الحلم يستأذنون كل ما أرادوا الدخول، إذا بلغ الحلم، خمسة عشر سنة، أو أنبت الشعر الخشن حول فرجه، أو أمنى، خروج المني مع الشهوة، قد بلغ الحلم حينئذٍ يستأذن كل ما أراد الدخول، قد تكون أمه على غير حالة حسنة، قد تكون زوجته، قد تكون أخته، المقصود يستأذن عليهم حتى لا يفاجئهم على حالةٍ لا يرضونها، أما إذا كان دون ذلك يستأذن في العورات الثلاث.