Fence Construction

The outside edge of the fence which you own signifies the edge of the boundary line.
The fence rails & posts are the main structural components and need checking for maintenance purposes. This can only easily be done if the posts & rails of the fence are on the owners side.
Fence rails can be used as a ladder if someone wanted to gain access into your garden / property, so it is better to have the rails on the owners side of the fence.
To have off-set fencing, with the posts on your neighbours side, will mean loosing part of your garden as the outside of the fence in this case would be the fence posts.

Inline fencing is the only choice to have the same finished look from both sides of the fence with a large selection of same sided panels.
The fence styles which are the same or very simular both sides can be Traditional Lap, Panel Weave, Willow Weave, Trellis, varying Decorative Style, Venetian just to name a few

Offset fencing style is when the boundary line of the fence is set away from the fence post line. The boundary line to your neighours property is the outside edge of the rails, paling boards or wire if the posts & rails are on the fence owners side.
The outside edge of the fence which you own signifies the boundary line.
The posts on an offset fence will be within the owners boundary line.
To have off-set fencing, with the posts on your neighbours side, will mean loosing part of your garden as the outside of the fence in this case would be the posts.

Boundary

Boundary ownership is shown on a property’s deeds by a T or H next to the boundary lines.
A Shared boundary is known as a Party Fence or Party Boundary. A letter H is 2 inverted T letters which are joined at the tail with the boundary line in between signifying a shared boundary.
If the inverted T letter is only marked on your side of the owners property boundary, it signifies that it is your boundary to maintain. You have a legal obligation to maintain your boundary and being mindful of any risk to others, protecting their safety.
Occasionaly there is no documents of boundary ownership and would seen as a friendly gesture to share the cost.
Although it is your obligation to maintain your boundary, being taken to court by a neighbour or member of the public will cost much more than a fence, especially if it causes harm to others through neglect of maintenance.

The boarded side of the fence should face toward your neighbour. Not only is this more polite, but it is the standard practise and makes post and rail maintenance easier of the main fence styles. However if the fence is errected within your boundary, there is no legal obligation who should have the good side of the fence.
The fence boundary must not encroach into the neighbouring property at any point.
There is no law to say who gets the good side of the fence but its more pragmatic to have the posts and rail easy to inspect and for maintenance in the event the fence needs repair.
If the fence you own is chosen to have the posts on the neighbour’s side of the fence, it would still mean the posts would have to be within your boundary and not encroach on to the neighbouring property. This would mean you would lose some of your garden size if you choose to have an Offset Fencing Style.
The supporting concrete around the bottom of the post can be within the neighbour’s boundary.

The short answer to this question is “no”. If you own the fence and you have not granted your neighbour permission to do so, they are not allowed to deface or nail anything to your fence.

A neighbour cannot grow plants on your fence without permission from the owner of the fence.

Any invasive and vigorous growing plants like ivy, have the capabilities of damaging structures like fencing, brickwork, concrete post recess channels and the tiles on the roof.
Ivy will add weight to a fence, so if the fence is rotten there is a greater risk of falling in high wind.
There is a pro side to growing ivy on a fence as the ivy will help bind the fence boards to the rails and bind the rails to the posts if the fixings used in construction of the fence rust and fail to do the job which they are designed for. However, this would increase the time and cost when replacing the fence.

Planning permission is required for a fence & trellis if the height exceeds 2 metres (6.56ft) above the ground level point of the fence.
If your fence height is higher than 1 metre (3.28ft) and you live next to a public highway used by vehicles or pedestrians, you may need planning permission.
The height allowance for a front garden fence varies up to 2 metres high as some properties are open plan and not allowed a fence on some boundaries.

Front garden fences height varies on residential areas & location of the property at roadside.
Open plan residential areas have very low height restrictions for boundary structures.
Best advice is to contact your local council to recieve the correct information.
A garden fence guide would be to look at the neighbouring gardens for the fence height guidance.