It is recommended to offer voluntary prayers in one’s house although it is permissible to offer them in the masjid Sahih Muslim 777 a
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا يَحْيَى، عَنْ عُبَيْدِ اللَّهِ، قَالَ أَخْبَرَنِي نَافِعٌ، عَنِ ابْنِ، عُمَرَ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ "اجْعَلُوا مِنْ صَلاَتِكُمْ فِي بُيُوتِكُمْ وَلاَ تَتَّخِذُوهَا قُبُورًا "
Translation
Ibn 'Umar reported Allah's Apostle (ﷺ) as saying
Observe some of your prayers in your houses and do not make them graves.