According to Approved Document B of the Building Regulations, a ‘boundary’ is ‘…the boundary of the land belonging to the building, or where the land abuts a road, railway, canal or river, the centre line of that road, railway, canal or river.
Relevant boundaries are boundaries which a wall faces, whether it is the actual boundary of the site, or a notional boundary.
An notional boundary is an assumed boundary between two buildings.
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