You can only change your neighbor's fence with their permission. A neighbor's fence is their property, and altering it without their consent could constitute trespassing or property damage, which may have legal consequences. If you have concerns or disagreements about your neighbor's fence, communicate with them openly and try to reach a mutually agreeable solution. If you believe the fence violates local zoning laws or property regulations, consult with local authorities or seek legal advice to address the issue through proper channels. 

Glass fences are extremely strong. You can drop 10mm thick tempered glass on concrete and it wouldn't break. Considering that certain types of glass are bulletproof, glass has the capacity to be exceptionally durable and resistant to breaking. Certain types of glass, like laminated glass, are designed to not shatter at all, but rather break into giant pieces.

You can reuse chain link fences as long as they’re in good condition. The best part—reusing it helps you make the most of the cost of a chain link fence. Whether you want to reuse it or consider asking someone to remove it for you in exchange for a free fence, it’s possible. If you can’t find a location for it in your yard, you can repurpose a chain link fence by donating it to a local animal shelter or community garden.

Who pays for a new fence between neighbors depends on its location relative to the property line. If you build the fence entirely on your property, you are solely responsible for the costs of installation, maintenance, and repair. If the fence is built directly on the property line, both neighbors are typically responsible for the costs. In this case, it is essential to consult with your neighbor beforehand to agree on a plan for payment. While you should always inform your neighbor of your plans in advance, you generally cannot force them to contribute financially unless there are specific local laws, such as in California, where both parties might be responsible for costs unless a different agreement exists. It's a good idea to get a property line survey to know the exact boundaries before building.