The UK authorities set a course towards Carbon Neutrality, i.e. a situation where the amount of carbon dioxide emitted into the atmosphere is equal to the amount of CO2 taken out of it, five years ago. Since then, new buildings have been designed with technologies that minimise the environmental impact. They also modernise the existing buildings taking into account the chosen course. All these changes cannot but be reflected in the final cost of commercial buildings. The financial burden falls on both property owners and responsible tenants. There is an increase in rents by 8-18% in those buildings where a programme of transition to environmentally friendly operating technologies is already being implemented. Moreover, the more the property complies with the government’s policy, the higher the premium. Appraisers play an important role in pricing – their verdict determines how much the price rises in case of modernisation.