In the UK most garden plots are divided using timber fencing. As it is more economical and immediate than walling or planting a hedge.

Panelled Fencing
The most widely used method due to the flexibility, availability and easy erection.

Pressure treated timber posts are concreted approximately 18"-24" into the ground, a panel distance apart.
Pre made panels are then secured to the upright posts using brackets and or screws.
A cap or finial should be secured to the top of each post to protect it from the weather.
If the panels are in contact with the ground, gravel boards should be used beneath the fence to prevent moisture rising and damaging the fence.

Prices for panelled fences vary depending on the height, quality and type.

Close Board Fencing
A more expensive fencing method than panel fencing but much stronger and more durable.

Each pressure treated post is positioned and held in place, while the shaped end of an arris rail is inserted into the pre manufactured slots in the post
The next post is then erected, slotting the other end of the arris rails into place.
This method continues until the full length of the proposed fence is complete.
Before the posts are concreted the fence needs to be made level.
When the concrete has set the close board panels can be secured to the arris rails with nails or screws.