This is not a sunnah!! Shaykh Ibn ‘Uthaymeen (may Allah have mercy on him) was asked the following question: It says in the hadeeth that the Prophet (blessings and peace of Allah be upon him) used to say takbeer when climbing a hill and tasbeeh when going down into a valley. Is this takbeer and tasbeeh only when travelling, or did he say takbeer – for example – at home when going up to the second and third floor? May Allah reward you with good.  He replied:  During his journeys, when the Prophet (blessings and peace of Allah be upon him) climbed up a hill he would say takbeer, and when he went down into a valley he would say tasbeeh. That is because the one who is above a thing may feel proud and think that he is great, so it is appropriate for him to proclaim the greatness of Allah, may He be glorified and exalted, by saying: Allahu akbar. And when he descends, he is going down to a lower level, so it is appropriate for him to glorify Allah, may He be glorified and exalted, when going down. This is the context of saying takbeer and tasbeeh.  But there is no report in the Sunnah (prophetic teachings) about doing that when not travelling. Acts of worship are based on tawqeef i.e., they are limited to what is narrated in sound reports. Based on that, when a person goes up the stairs in his house he does not have to say takbeer, and when he comes downstairs he does not have to say tasbeeh. Rather that only applies in the case of travelling.  [Liqaa’aat al-Bab al-Maftooh]