To allow the construction a dwelling 200mm away from his boundary
and to make good any damage that may be required to the boundary after construction.
To build within 200mm from his boundary wall
The question is v common. He owns the airspace "up to the heavens". http://en.wikipedia.org/wiki/Cuius_est_solum_eius_est_usque_ad_coelum_et_ad_inferos
Although you can erect scaffolding on his land (under access toneighbouring land act) for maintenance you cannot for new build. The same applies toa cantilever scaffold. You must have his consnet. If he simply refuses, youhave no cause of action and have to rejig your plans or offer him money.
Can I help further?
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