Praying nawafil at home

عَنِ ابْنِ عُمَرَ، عَنِ النَّبِيّ صلى الله عليه وسلم قَالَ: اجْعَلُوا فِي بُيُوتِكُمْ مِنْ صَلاَتِكُمْ، وَلاَ تَتَّخِذُوهَا قُبُورًا.‏

Hazrat Ibn Umar^ra narrated, “The Prophet^sa had said, ‘Perform some of your [voluntary] prayers in your houses and do not turn them into graveyards.’” (Sahih al-Bukhari, Kitab as-salat, Bab karahiyyati s-salat fi l-maqabir, Hadith 432)