The times is auspicious or inauspicious it depends on your personal chart yes but there are some auspicious muhurats in which you can book the house, plot or deal in lands.
You should Avoid Rahu Kaal, Panchak, Yamganda Kaal, Dur Muhurats,kaal vela, Horas of Paapagrahas & Kaala, Roga, Udvega and Chala Choghadias.
Along with this you should also see the tarabalam as per the person who is buying the product.
But still you can follow some auspicious days for buying a above mentions products.
1) Akshaya Tritiya
3) Abhijit Muhurat
4) Gudi Padwa
5) Kartik Shukla Pratipada
6) Guru Pushya Yoga