One sits on the legal boundary; the other sits wherever the problem is.
A boundary fence exists to define and secure the property line, and in New Zealand it commonly comes with shared cost-sharing expectations between neighbours when it sits on that surveyed line. A privacy screen exists to block a specific view — it can be freestanding anywhere on the property, attached to an existing fence, or built well away from the boundary entirely, and it does not carry the same shared-responsibility assumptions because it is not a boundary structure.
The practical difference shows up most clearly when only one or two sightlines are the actual problem. Replacing an entire boundary fence to gain privacy from one overlooking window is expensive and often unnecessary; a targeted screen at the right point can solve the same problem for less, without renegotiating a shared boundary structure with a neighbour.
01 · Compare directly
Fence and privacy screen, side by side.
Boundary fence
PurposeDefines and secures the property line along its full length
Cost-sharingCommonly subject to shared-cost expectations between neighbours when on the surveyed boundary
HeightOften governed by standard boundary height rules that vary by zone and council
Wind performanceA long, solid run is more exposed to wind loading and may need engineering in exposed areas
Privacy screen
PurposeBlocks a specific sightline — length and position are set by the problem, not the boundary
Cost-sharingNo shared-cost expectation, since it is not a boundary structure — the property owner who wants it pays for it
HeightSet by the actual sightline geometry, which can be taller or shorter than a standard fence
Wind performanceA shorter, freestanding screen can be engineered or chosen (permeable slats) specifically for the local wind exposure
02 · What decides which one you need
Four questions to ask before defaulting to a fence.
Is the whole boundary the problem, or one sightline?
If overlooking comes from one specific window or deck, a full-length fence solves far more than the actual problem — and costs accordingly.
Does an existing fence already secure the boundary?
If the boundary is already fenced and functional, a privacy screen addressing the specific sightline may be all that is needed on top of it.
Is the site wind-exposed?
Solid, tall boundary runs in exposed locations can create turbulence; a permeable screen positioned off the boundary often performs better.
Is the neighbour relationship relevant?
Fence work on a shared boundary usually involves the neighbour in cost and decision-making; a screen built entirely on your own land generally does not.
03 · Two worked situations
Same goal, different structures.
Existing low boundary fence, new two-storey neighbour
The boundary is already fenced and shared cost has already been settled historically. The new overlooking issue is a single upstairs window — a targeted privacy screen positioned at the specific angle resolves it without touching the existing fence.
Bare rear boundary on a new subdivision
No fence exists yet, and both security and privacy are needed along the full run. This is a genuine boundary fence decision from the start, with privacy built into its height and design rather than added afterward.
04 · Before you decide
Confirm the actual problem first.
- Identify whether an existing boundary fence already does the security and demarcation job.
- Photograph the specific overlooked view before assuming the whole boundary needs treatment.
- Check local height rules for both boundary fences and freestanding screens — they can differ.
- If a fence is involved, discuss cost-sharing with the neighbour before finalising material or height.
Privacy screen vs. fence: common questions
Can a privacy screen replace a boundary fence entirely?
Only if boundary demarcation and security are not required — most properties still need a boundary fence for those purposes even where a separate privacy screen also exists.
Does a privacy screen need to be on the boundary at all?
No — it can sit anywhere on the property that resolves the sightline, which is often set back from the boundary rather than on it.
Who pays if I want a screen but my neighbour wants a fence?
Because they are different structures with different purposes, this is usually two separate conversations rather than one shared-cost negotiation.
Are there height limits either way?
Yes, both can be subject to height restrictions depending on council rules and proximity to boundaries — confirm before building either.
Sources & methodology
Designed to show its working.
Boundary fencing cost-sharing and height rules vary by legislation and council district plan. This guide is general comparison guidance; confirm specific obligations for the property before proceeding.