Devon,
United Kingdom 
We are just about to buy an old 1930's house which has a large Magnolia tree planted directly outside the french doors, about 15ft in height.Will this damage the house so should we remove completely or just cut hard back ?
7 Jun, 2010
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Depending on conditions (light,etc.), 15 ft sounds a fair height to me, though
further growth is always a possibility.
If root damage to foundations has not already occurred (or subsidence from water abstraction), then perhaps on-going observation only, is all that is required.
A shame to cut back a lovely tree (yet).
7 Jun, 2010