Have you noticed this recently? Was it like this when you moved in but perhaps you didn't notice.
From the road side of the fence do the concrete gravel boards look level or follow a slope of the pavement?
If it's none of the above, and happened recently, there may be some form of subsidence outside your property.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local