Fence height dispute — planning or civil matter?

Our neighbour has just erected a 2.4m fence along our shared boundary. It's solid timber panels and completely blocks our view and afternoon sun.

I know the general rule is 2m max for back gardens without planning, but is there any exception for party boundaries? And does the height include the fence posts or just the panels?

Also, the fence is actually on our side of the boundary by about 15cm. Is this now a planning issue, a boundary dispute, or both? Should I approach planning enforcement or a solicitor first?

The 2m rule applies to the total height including posts. And yes, the height is measured from ground level on your side.

If it's on your land by 15cm, that's technically trespass. But a solicitor will cost you £300+/hour. Most people solve this by having a polite conversation first. If that fails, a strongly worded letter from a solicitor usually does the trick.

Planning enforcement won't usually get involved in fence height unless it's part of a larger development or it's causing a highway safety issue. Your best route is the boundary dispute angle.

Had the conversation. They claim the boundary is actually 20cm further onto our side than we thought. Looks like we'll need to check the deeds properly. Joy.