How much does it cost to deal with my tree splits into two trunks and it looks like it's coming apart where they meet?

Cost splits between a pruning visit and a hardware install. Drivers: how high the union sits (a union 40 feet up means a climber or a lift, and lift access means gate width and lawn ruts), how many stems need support and whether one cable will do or the tree needs a triangle of them, whether reduction pruning happens at the same visit, and whether the drop zone is open lawn or a roof, fence, or driveway that forces every piece to be rigged down. Steel systems cost more to install than synthetic rope systems but are standard on large stems, and both add a recurring inspection cost you should be quoted up front. Catching it young is dramatically cheaper — subordination on a small tree is minutes of work.