The left house side is actually not proportional to the front but since the final rendering only uses the front view (with light being emitted from the windows), it should work well.
I’ve remodeled the terrace side of the mansion after taking a closer look at the footage. The terrace roof has been replaced by a carport. Some more hedges and windows have been added after stretching the house towards its backside. The supports of the veranda ar now more detailed: