The Radley home has been in Maycomb for some time. Two old oak trees stand sentry at the edge of the lot (Ch 4). Upkeep on the home has been minimal. A shutter hangs loosely and askew on its hinges (Ch 6). The paint is chipped and the whole place looks weather-worn (Ch 6).
Around back, a high wire fence "enclosed a large garden and a narrow wooden outhouse." This description speaks to the Radely's poverty. The apparently do not have indoor plumbing and probably grow most of their food (the garden is large, not a hobbyist's plot.) (6)
"The back of the Radely house was less inviting that the front: a ramshackle porch ran the width of the house; there were two doors and two dark windows between the doors. Instead of a column, a rough two-by-four supported on end of the roof. An old Franklin stove sat in a corner of the porch; above it a rat-rack mirror caught the moon and shone eerily." (Ch 6)
Lee presents Boo Radleys house to us in a way that is commonly interpreted as gothic horror. I believe that this is a good way to describe the technique used, as words such as 'once white' influencing the idea thatits now something else, or something inside has changed to something darker. Rather than creating a literal image, Lee lets our imaginations create our own interpretation of the Boo Radley house.