However, you should make sure you follow the rules when it comes to erecting new garden fences and even making existing ones higher. Who is responsible for maintaining a garden fence? Residents are being reminded of the rules surrounding garden fences to avoid potential legal issues. How much can I be fined for my garden fence? Here's the breakdown:Hedge height regulations: £1,000Tree Preservation Orders: £20,000Bonfires and smoke nuisance: £5,000 (domestic properties)How tall can a garden fence be without causing legal problems and getting fines?