I have a 10.5 m high approx. 18-y-o redwood tree (unknown variety, age estimated from age of house) growing on my property line and beside the concrete driveway and asphalt road. I have had to trim the lower branches to keep access open to my driveway. The roots are causing the driveway and road to buckle, and a brick lamp post <2m from the trunk is dangerously close to toppling. I want to avoid cutting the tree down if possible. This fall I cut the branches from the top 2m of the tree and shortened some remaining upper branches by approximately 1/3 of their length, hoping to slow the growth. I will have to hire a tree company to use a lift truck to cut off the 2m spire as it is too heavy for me. While they are at it, I was thinking of having many of the branches pruned by maybe 1/4 of their length, though in a way that looks pleasing. My question is, if my only reason for the pruning is to slow root growth, would it be worth the extra $200 to have them prune the tree when removing the spire? Another question contingent on the first is, would it be more effective to remove, say another 3 m (i.e., the top half of the tree)? If it turns out the best solution is to remove the tree altogether, I'll remove all the branches then invest that money in having them cut the trunk down; but I'd really like to keep the tree so I'm trying to weigh options.