Another example:
We (SZ) are allowed a 120cm non-permanent (not set in concrete) non-solid fence on the property border. Generally the only fences that meet this are green wire or a wooden rail fence. A fence of 2m, again non-permanent, non-solid, may be allowed with a 1 meter set-back if the adjoining neighbors sign off on it.
Hedges must also be kept clipped to 120cm at the borderline, 2m if set 1 meter back. One might need to plant farther back than the setback to allow for natural plant growth.
Be aware that some hedge plants might not be allowed. For instance, Boxwood is under review in our village at present, due to the blight that took hold in recent years.
The property zone will also affect what you can do. If in the agricultural, forest, or water zones there will be additional bureaucracies to satisfy. Or, as in our property, if you border one of those you might find additional rules even though your property itself is Bauzone. (We border a farm, so the last 10 meters of our property running along the farm border are considered a green zone, special rules apply.)
Anything permanent or solid, while allowed without planning permission if under 120cm, must have written agreement from all residents in the Quartier, not just adjoining neighbotrs, and must fit the Quartier Gestaltungsplan. One neighbor's objection can scuttle the project; without all neighbors' agreement, one must go through the full planning permission process.
Fence height here is measured from the property borderline - an important difference if one lives on a hill.
Also one must understand access issues when building a fence, as well as when maintaining one. Will your neighbors allow you to step on their property? If not, you will need to set the fence back. If you need access to the neighbor's side while building the fence you likely will need to pay some kind of compensation.
Check the Grundbuch for official rights of access - usually these are granted to utility companies but also might be granted to others, and may mean that a fence is not possible even if general regs allow one. Sometimes a fence is allowed on a right of way if an unlocked gate is included.
If you are putting up a fence to keep animals in, check requirements for warning signs.
If permits are not needed, only neighborhood sign-off, we have to make up a dossier to give to each neighbor showing the placement of the fence along the Katasterplan with appropriate dimensions, including pictures of what the finished fence will look like.
We are also required to run a string at the proposed height, showing neighbors where the fence will be built, and leave it up for a specific objection period.
If anyone questions the placement of the fence, it might be necessary to get the Gemeinde engineer out to do a property survey. This usually happens when the the property is not a straight line from one border marker to the next. Or when the border markers cannot be found.
Be aware of what the previous owner might or might not have done with the property. Any exchange of property rights should be entered into the Grundbuch, but if a previous owner had allowed a neighbor to plant (i.e., use) on his side of the property border for some years without objection this could be construed as adverse possession... and unleash the mother of all Nachbarkriege.
Oh - and you might find that none of the rules matter if one is well connected in the Gemeinde. In a small village those with sufficient Vitamin B generally do whatever they want.
---
Ya'd think that building a simple fence would be a simple project... aber...
So Emily - you can see that there is a wide variation of what is and is not allowed, and even then rules are generally subject to local interpretation. The only people who can answer your question are the folks at the Gemeinde Bauamt. So go and speak to them in person. Make sure the person you speak to actually has the authority to give an answer, and before building get the rules as they apply to your project in writing.
Good luck!