As you know from living in a house, houses are frequently modified by their owners. Remodeling, additions, construction of out buildings, etc. can change the style and function of living spaces drastically. Ideally, we would trace these changes through historical building permits. However, in Elkhart County, building permits are not retained permanently.
We will instead look at Sanborn Maps to seek evidence of dramatic changes to the house you are researching. The Indiana Room at Goshen Public Library has large black and white hard copies (also on microfilm) of Goshen Sanborn maps for the years 1886, 1892, 1896, 1901, 1905, 1910, 1917, and 1926. Color images of 1886, 1892, 1896 are readily viewable online through the Library of Congress. All maps (except 1926) are also available through the Indiana Spacial Data Portal.
Tips for using the Indiana Spacial Data Portal Sanborn Maps: