The Government have not issued guidance concerning the building of new properties near pylons.
However, following the publication of the (then) National Radiological Protection Board's new Electromagnetic Field guidelines in March 2004, and the associated advice to Government, the Government are giving further consideration to taking the issue of building near power lines and pylons and is consulting with all the relevant stakeholder groups.
The Government are considering the implications of Health Protection Agency advice regarding power lines with all stakeholders. Implications for the areas outlined in the question will be fully considered in deciding how to implement the advice.
When appropriate policy options have been formulated the Government will undertake a consultation on the options in the normal manner.