Article summary
Choosing the right fence height to block sightlines while staying within Auckland's council rules.
- Category:
- design
- Read time:
- 8 min
- Published:
- 4 August 2025
- Written by:
- My Homes Fencing Expert
Quick answer: 1.8m is the sweet spot for privacy on most Auckland boundaries — tall enough to block sightlines for someone standing in the neighbouring yard, while still sitting within the 2m limit you can generally build without consent. Where you're overlooked by a two-storey home or a raised deck, stepping up to a taller screen (which may need consent) or adding a slat topper in just that spot works better than raising the whole fence.
The right privacy height isn't just 'as tall as possible' — it's about where the sightlines actually come from, and staying inside the rules. Here's how to get it right.
Privacy Height Is a Sightline Calculation
There is no single correct privacy height, and anyone who gives you one without asking a question is guessing. Whether a fence blocks a view depends on three things: how high the viewer's eyes are, how far they are from the fence, and how far you are on the other side of it.
Change any one and the required height changes with it. A fence that gives complete privacy from a neighbour standing right against it may hide nothing from the same person standing ten metres back — because the further away they stand, the more of your yard comes into view over the top.
This is why targeted screening so often beats a taller boundary. Once you think of it as geometry rather than height, you start solving the actual problem instead of buying metres of fence and hoping.
Why 1.8 Metres Became the Standard
The figure is not arbitrary. Adult eye height sits somewhere around 1.55 to 1.75 metres for most people, so a 1.8-metre fence puts its top edge above the eye line of nearly everyone standing on flat ground on the other side. That is the whole logic.
It also happens to sit comfortably below the two-metre threshold at which most Auckland residential zones stop treating a fence as a permitted activity. So 1.8 metres is the tallest common height that reliably blocks a standing adult and stays clear of a consent conversation — a useful coincidence rather than a design insight.
What it does not do is hide you from someone taller than average standing right at the fence, from anyone on anything raised, or from a viewer standing well back. It blocks the standard case, which covers most boundaries most of the time.
What Each Height Actually Blocks
At 1.2 metres you have a boundary marker. It defines the property and stops casual wandering, and it hides you only when you are seated. Anyone standing sees straight over. This is front-yard and garden-division height, not privacy height.
At 1.5 metres you get partial screening. A standing adult on the other side sees your head and shoulders; you see theirs. It is enough to remove the feeling of being in a shared space and enough for privacy while seated on a deck or at a table, which is often all people actually want.
At 1.8 metres you get standing privacy on flat ground for the common case. At 2 metres you gain a modest additional margin — useful where the ground falls slightly toward the neighbour, or where the viewer is unusually tall or standing back. The jump from 1.8 to 2 buys less than people expect, which is worth knowing before paying for it.
Distance Changes Everything
Here is the factor most people leave out. A fence blocks a wedge of sightline, and that wedge narrows the further the viewer stands from it. Someone pressed against the far side of a 1.8-metre fence sees almost nothing of your yard. The same person twenty metres back sees a substantial portion of it over the top.
That has a direct practical consequence: where you are matters as much as where they are. Sitting close to the fence, you are deep inside its shadow and well hidden. Sitting in the middle of the yard, you are visible from positions that the fence appears to cover.
It also explains why screens work so well. A screen placed close to your seating area blocks a very wide angle for very little material, because you are right behind it. The same protection from the boundary needs a much taller, much longer fence — which is why the cheapest privacy is almost always the screen nearest you rather than the fence furthest away.
When the Viewer Is Higher Than You
Everything above assumes both parties are on level ground. Raise the viewer and the arithmetic turns against you fast, because a downward sightline passes over a fence at a height no realistic boundary fence will reach.
The three common cases are a neighbouring second storey, a raised deck next door, and a sloping section where their ground sits above yours. In all three, adding half a metre to the boundary fence typically achieves almost nothing measurable — which is exactly the disappointing outcome plenty of homeowners have already paid for.
The effective answers are different in kind rather than in height. Screening close to your own space, overhead structures such as a pergola with a solid or louvred section, louvre fencing angled specifically against a downward view, and planting that gains height over time all address a high viewer in ways a taller boundary cannot.
Working Out Your Own Numbers
You do not need trigonometry, just a helper and twenty minutes. Sit or stand in the exact spot you want private. Have someone stand at the viewpoint that bothers you — their deck, their side of the boundary, the footpath. Then have a third person, or the same helper afterwards, hold a broom or a length of timber vertically along the fence line while you both call out what you can see.
Move the timber along the boundary as well as up and down. You will usually find the blocking position is not where you assumed, and that a surprisingly short section at the right point does the whole job.
Do it at the time of day you actually use the space, and remember to check both directions — a fence that hides you from them generally hides them from you, which is sometimes desirable and occasionally not. Once you have the height and the position, you have a specification instead of a guess.
Height You Can't Have, and What to Do Instead
In most Auckland residential zones two metres is the practical ceiling for a boundary fence before resource consent enters the picture, and front and street-facing boundaries are held lower again. So the honest position is that height alone often cannot solve a genuine overlooking problem.
The alternatives that do work: a freestanding screen set back from the boundary, which is frequently treated differently from a boundary fence and — placed close to you — blocks far more for far less; louvres angled against a downward view; planting above a compliant fence; and, where the problem justifies it, a resource consent application, which is a process rather than a refusal.
Getting the height right is worth doing properly, because it is the one decision you cannot adjust later without rebuilding. My Homes Fencing Expert will walk the actual sightlines on your section and confirm what your zone allows before quoting a height. Call 022 315 8987 or book a free, no-obligation site visit.
Frequently Asked Questions
1.8m for the standard case — it puts the top edge above the eye line of most adults standing on flat ground, and stays under the 2m threshold in most Auckland residential zones. But the right height depends on the viewer's eye height and how far back each of you stands.
Adult eye height is roughly 1.55–1.75m, so 1.8m clears nearly everyone standing on level ground on the other side. It also sits below the 2m point where most Auckland zones stop treating a fence as permitted — the tallest common height that works and avoids consent.
For seated privacy, often yes — enough to remove the sense of sharing a space while you're at a table or on a deck. A standing adult on the other side will still see your head and shoulders, and you'll see theirs.
Less than people expect. The extra 200mm buys a modest margin, useful where the ground falls toward the neighbour or the viewer is tall or standing well back. It's worth knowing that before paying for it — and it takes you to the consent threshold.
Almost always because of distance or level. A fence blocks a wedge of sightline that narrows the further the viewer stands back, so someone twenty metres away sees over it. And if they're on a deck, upstairs or higher ground, no realistic boundary height blocks a downward view.
Not with a taller boundary fence — that's the fix that disappoints. Screen close to your own space instead, use an overhead structure like a pergola with a solid or louvred section, use louvre fencing angled against the downward view, or add planting that gains height over time.
Stand where you want privacy, have someone stand at the viewpoint that bothers you, and hold a broom or length of timber vertically along the boundary while you call out what you can see. Move it along the line too — the blocking position is usually not where you assumed.
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