Is it permissible for a Muslim woman to wear trousers at home?
                                Wearing trousers at home isn't prohibited so long as non-Mahrams do not see her. And Allah Knows Best.
                             
                        
                            
                                
                                How many Rak`ahs (unit of prayer) are offered in Witr prayer?
                                All perfect praise be to Allah, The Lord of The Worlds                                                                                                                                                                  Witr (an odd number prayer performed between Isha`a and Fajr) is offered with a minimum of one Rak`ah, and a maximum of eleven, but offering three Rak`ahs is the minimum of its complete form. And Allah Knows Best.
                             
                        
                            
                                
                                I`m a building contractor. I have been building a house for a client, but the construction process stopped for some reason. Unfortunately, currently, prices of materials have multiplied, is it allowed for me to demand an increase in the agreed price?
                                All perfect praise be to Allah the Lord of the Worlds. May His peace and blessings be upon our Prophet Mohammad and upon all his family and companions.
It is more appropriate to approach the client and try to reach a mutually satisfactory solution. And Allah The Almighty Knows Best.
                             
                        
                            
                                
                                 Is it permissible to pay the Zakah to my grandmother who lives alone in a rented accommodation with bad conditions noting she had three sons. 
                                Zakah cannot be given to ascendants (parents and grandparents). It is obligatory for her sons and grandsons to provide for her, and they would be sinful if they fail to do so. And Allah Knows Best.