Fence + Trellis Height Calculator

Add the fence, wall/base and trellis together and compare the total with the standard planning-height threshold for your location.

Quick checkTakes about a minute. No account needed.

Why add everything together? For planning-height purposes, the total boundary structure matters. A trellis or decorative topper can push an otherwise ordinary fence over the standard threshold.

1. Where is the property? England Wales Scotland Northern Ireland

2. Enter the component heights in metres

Fence panel / main fence

Wall / gravel board / base

Trellis / topper

Example: 1.8m fence + 0.3m trellis = 2.1m total.

3. Is the fence next to a road/highway?

Choose a country first and the wording will adapt.

Yes No Not sure

4. Do any special restrictions apply? Listed building Within / bounding the curtilage of a listed building Conservation area Article 4 / permitted-development restriction

Article 4: a local planning rule that removes some normal permitted-development rights, meaning you may need planning permission for work that would usually not require it.

Planning condition affecting fences/walls/gates

Useful next checks

If the total is close to or above the threshold, use the fuller Fence Height Checker. It asks about replacement work and existing heights as well as the basic location rules.

You can also read our guide: Does trellis count towards fence height?