The goal of this work is to elucidate capital expenditure (CAPEX) for amine scrubbing projects by comparing the detailed bottom-up CAPEX estimates developed for two proposed retrofits of NGCC power plants with amine scrubbing units. This comparison yields insights that could reduce the costs of future CCS projects. A key finding is that the layout and special requirements (such as water availability) of the host site can greatly impact the cost of ancillary equipment such as flue gas ductwork and heat exchangers. The steam supply (extraction vs. boiler) also significantly affects the cost of utility equipment.