There is nothing to stop you from putting up a fence panel to stop entry through the gate that he installed in the fence he built.
However, you will need to know where the fence line is before you put that fence panel in place as it cannot encroach onto his property.
If the fence and gate that the neighbour built encroaches onto your property, then you have grounds to ask the neighbour to move the fence back onto the right alignment. If this is so you can also ask that the gate opening be closed off with a fencing panel. You may have to contribute to the cost of that panel.
The first step is to establish where the actual boundary is. This neighbour may have infilled the fence line going off of the other neighbours constructed fences. If this is the case, then your problem will have grown and maybe become more difficult to resolve simply.
Another thought is that the fire department for your area may have requested that your neighbour have a gate in his back fence so that they can gain access to your property to fight a fire should one be on your property. This may be so if the fire trucks can gain access through your neighbour's property to his back fence which abuts your property. You need to cover all bases and do your homework thoroughly before you start any actions to resolve the issues.
Neighbours can be real pains to deal with because it becomes an emotional issue with them and emotions are difficult to fight against.
Prayer might be the only option that you have at this point in time. We all need people who will pray that God will continue to draw us all into a deeper relationship with Him.
Shalom
However, you will need to know where the fence line is before you put that fence panel in place as it cannot encroach onto his property.
If the fence and gate that the neighbour built encroaches onto your property, then you have grounds to ask the neighbour to move the fence back onto the right alignment. If this is so you can also ask that the gate opening be closed off with a fencing panel. You may have to contribute to the cost of that panel.
The first step is to establish where the actual boundary is. This neighbour may have infilled the fence line going off of the other neighbours constructed fences. If this is the case, then your problem will have grown and maybe become more difficult to resolve simply.
Another thought is that the fire department for your area may have requested that your neighbour have a gate in his back fence so that they can gain access to your property to fight a fire should one be on your property. This may be so if the fire trucks can gain access through your neighbour's property to his back fence which abuts your property. You need to cover all bases and do your homework thoroughly before you start any actions to resolve the issues.
Neighbours can be real pains to deal with because it becomes an emotional issue with them and emotions are difficult to fight against.
Prayer might be the only option that you have at this point in time. We all need people who will pray that God will continue to draw us all into a deeper relationship with Him.
Shalom