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Retro-fitting MVHR (Mechanical Ventilation with Heat Recovery) to an existing house can be a challenging and time consuming task. The significant materials costs, and the installation time can make it quite pricey.

The upside is a constant supply of pre-warmed fresh air, and some energy savings compared to open-vent cool air inflow. The downside is disruption during the work and loss of space for the bulky ducting within walls and ceiling spaces.  It's usually only worthwhile in properties which are already improved to a high degree of insulation and air-tightness. 

MVHR installation is subject to adherence to part F of the Building Regulations, and technically  will need a Building Notice Application.  For retro-fit, in my experience, this this can depend on the opinion of your local Building Controller which can vary between Council areas. 

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