A substantial amount of research has been conducted using a variety of methodological approaches to determine what influences life satisfaction. The bottom-up theory considers overall life satisfaction as a function of various areas of life satisfaction, whereas the top-down theory considers the areas of life satisfaction as a function of dispositional factors such as personality. We examined these models in a large-scale UK survey. Consistent with other studies, we found that both the bottom-up and top-down models of life satisfaction are supported in the UK by demonstrating that both personality traits and life satisfaction variables can explain a significant portion of variance in overall life satisfaction. We propose that future studies in life satisfaction research should consider the integrated account of life satisfaction rather than a unitary bottom-up or top-down perspective.