The thickness of a glass fence varies widely based on its application and whether or not there are any safety requirements, but most fences are between 8 millimeters and 12 millimeters thick. 12-millimeter-thick glass is extremely strong and overkill in most cases, which is why you typically only see it around pools and in skyscrapers.

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. 

The average cost to install a fence that is 200 feet in length is $4,600, but this largely depends on the type of fence you build. For instance, a 200-linear-foot redwood fence costs between $3,600 and $7,000.

The price of purchasing and installing a fence around a pool is dependent on the type of fence material you choose. On average, a pool fence can cost anywhere from $1,000 to $10,000+. Chain link and mesh fences are the least expensive options, while a fully glass fence will cost the most. Having an inground or above-ground pool will also be a key factor in determining fence prices.