Looking at the building, I would think this is the original house.
Remember that date of directory is publication date, so probably refers to year before.
Before 1876 houses in directories on this street are not numbered, but in 1876 and 1878 , although nos 2,4, ^ 6 are listed , no8 is not, and I suspect that it was not then built. From then no 8 is listed as:
1879-1880 William Faraday Johnston
1882-1884 William Chambers
1888 -1890 John Hunt
1892-1895 Not listed
1896-1897 James Gething
1899-1903 William Jones, builder
1908 Mrs Mary Fearnsides
1910-1912 James Edward Bendall
1913 1924 Mrs Ellen Bendall
1932 William Wyatt
From 1912 it is best to use the electoral roll, so:
1912 James Bendall
1918 James Bendall. absent voter M/311023, -Pte, 1/1 GloucesYeo
1920 Limited but increased Suffrage , so some women have vote and are included
1920 James Edward, Henry, David, Ellen, and Gordon James Bendall
1922 Ellen & David Bendall
1925 Edward Morgan & William, Ellen, Walter and Francis Wyatt
1927 William, Ellen, Walter, Francis and Gordon Wyatt
1930 William, Ellen, Walter, Francis, Gordon, Winifred and Eleanor Wyatt
1935 William, Francis, Gordon, and Eleanor Wyatt
1939 Wilfred & Gladys Mann