What is included in the sale of a house is whatever is referred to when (someone says) house, if it is connected to it and fixed, not movable. [2180] Items like ladders, nailed shelves, and erected doors, they (the scholars) differed (in the) ruling regarding keys. The Hanafi, Maliki, and Shafi'i schools, and one opinion within the Hanbali school, hold that keys are included in the sale of a house without stipulation. However, the Hanbalis, and another opinion within the Shafi'i school, hold that they are not included. See: "Al-Fatawa al-Hindiyyah" (3/31), "Minh al-Jalil" by 'Ulaysh (5/285), "Minhaj al-Talibin" by al-Nawawi (p 106), "Matalib Uli al-Nuha" by al-Ruhaibani (3/191). This is based on the consensus of the four schools of thought: The Hanafis, [2181] See: "Tabyin al-Haqa'iq" by al-Zaila'i (4/9, 10), "Al-Binayah" by al-Ayni (8/33). Malikis, [2182] See: "Al-Taj wal-Ikleel" by al-Mawwaq (4/497), "Mawahib al-Jalil" by al-Hattab (6/446, 447), "Minh al-Jalil" by 'Ulaysh (5/284). Shafi`is, [2183] See: "Minhaj al-Talibin" by al-Nawawi (p 106), "Nihayat al-Muhtaj" by al-Ramli (4/132). and Hanbalis. [2184] See: "Al-Mubdi'" by Burhan al-Din Ibn Muflih (4/50), "Al-Insaf" by al-Mardawi (5/44, 45). The consensus has been stated regarding  this matter. [2185] Ibn Hazm said: "Whoever buys land owns everything on it including any existing structures or trees. Similarly, whoever buys a house owns all of it (i.e. the entire building) and everything installed in it such as doors or stairs, and other than that, and there is a certain consensus (in this matter)." See: "Al-Muhalla" (7/598). He also said: "They agreed that if someone buys a house, then the complete building and the hall, all of that are included in the sale." See: "Maratib al-Ijma'" (p: 89).
This is due to the following:
(1) Because whatever is mentioned by the name of the house is included in its parts due to its connection and fixation in it. [2186] See: "Nihayat al-Muhtaj" by al-Ramli (4/132).
(2) Because everything that is connected to the house is a decisive connection that is covered by the name of the house. [2187] See: "Tabyin al-Haqa'iq" by al-Zaila'i (4/9, 10).