When you're buying property in New Zealand, the word "easement" appears on almost every Record of Title. Most buyers understand the concept broadly — another party has a right to use part of your land — but stormwater and drainage easements are among the most commonly misunderstood, and potentially the most impactful on how you can use your property.
This guide explains exactly what stormwater and drainage easements are, how to find them on a title, and why understanding them before you buy can save you significant time, money, and headaches.
What Is a Stormwater or Drainage Easement?
A stormwater or drainage easement gives a specific party — often a council, neighbour, or utility provider — the legal right to direct water runoff or discharge wastewater across or beneath your land.
In New Zealand, these easements are typically registered against the property title and run with the land. That means when you buy the property, you take it on with the easement attached — regardless of whether it was disclosed clearly during the sale process.
There are two common types:
- Stormwater easements: Allow rainwater and surface runoff to be channelled through or under your land, usually via a pipe or drain. Very common in urban and suburban areas where council infrastructure crosses private land.
- Drainage easements: Cover the right to install, maintain, and access drainage infrastructure — including wastewater pipes — that runs beneath a property. The easement holder can legally enter your land to repair or service the pipes.
Why Do These Easements Exist?
New Zealand towns and cities developed gradually over decades. When stormwater networks were built, the most practical route for pipes often crossed private land. Councils and developers secured easements over those routes rather than acquiring the land outright.
Today, it's extremely common for residential properties — particularly in established suburbs — to have underground council stormwater or wastewater pipes passing beneath the garden, driveway, or even the house itself.
How Stormwater Easements Affect What You Can Do With Your Property
This is where buyers often get a surprise after settlement.
An easement doesn't stop you from owning or occupying the land — but it does restrict what you can build over or near the easement corridor. Common restrictions include:
- No permanent structures: You generally cannot build a house, deck, garage, or retaining wall over or across an easement strip without the easement holder's consent — and in many cases it simply won't be granted.
- Limited landscaping: Deep-rooted trees or large shrubs planted over a pipe easement may be required to be removed if they interfere with the infrastructure.
- Access rights: The easement holder (often the council) has the right to enter your property, dig up the ground, and repair or replace pipes — sometimes with little notice. They're generally required to reinstate the surface, but your garden or driveway may be disrupted.
- Subdivision constraints: If you're planning to subdivide, an easement may cut through proposed new lots in ways that affect the viability of the development.
How to Find Drainage and Stormwater Easements on a Title
The definitive source is the Record of Title ($42.90). The title document will list all registered encumbrances, including easements, in a specific section. You'll typically see a reference like:
Easement instrument [number] — right to convey stormwater in favour of [Council name]
However, the title itself often doesn't show you exactly where on the land the easement runs. For that, you need the survey plan (also called a deposited plan or DP). Survey plans show the precise location of easement corridors — often as a shaded or hatched strip across the lot diagram.
You can order a Survey Plan ($49.90) to see the exact easement location plotted against the property boundaries.
If you want a comprehensive picture before making an offer, our Pre-Purchase Package ($189.90) includes both the current title and supporting documents in one bundle.
Easements Not on the Title: The Hidden Risk
Here's an important point many buyers miss: not all drainage easements are formally registered on the title. In some cases — particularly with older properties — council stormwater infrastructure was laid across private land without a formal easement being registered. The pipe is there, it's been used for decades, but the title shows nothing.
This is known as an unregistered or informal easement, and it can still limit what you can do with the land. Councils may assert their right to access and maintain the pipe even without formal registration, and a conveyancer or surveyor will often pick this up during due diligence — but only if they investigate.
This is one reason a Guaranteed Search ($45.90) can be valuable: it provides the most current and certified view of what's registered against the title at the time of your search.
Council Infrastructure Maps and LIM Reports
While a title search tells you what's formally registered, a Land Information Memorandum (LIM) from the local council can reveal additional stormwater and drainage information — including council-owned infrastructure that crosses your property.
LIM reports typically include:
- Known stormwater and wastewater infrastructure the council is aware of on or near the property
- Any flooding or inundation history
- Overland flow paths (routes that surface water takes during heavy rain)
Combining a LIM with a Record of Title and survey plan gives you the most complete picture of drainage-related constraints before you buy.
What to Do If You Discover a Drainage Easement
Don't panic — most drainage easements are unproblematic for day-to-day living. The key questions to ask are:
- Where does the easement run? Get the survey plan to plot the exact location.
- Does it affect your plans? If you're planning to build a sleepout, extend the house, or subdivide, check whether the easement corridor conflicts with those plans.
- What are the access terms? Review the easement instrument (usually attached to the title documents) for the specific rights granted.
- Is the infrastructure well-maintained? Old cast-iron or clay pipes can collapse, causing subsidence. It's worth asking the council about the condition and age of their infrastructure.
Your conveyancer or solicitor should review any easements as part of the standard property purchase process. If you haven't ordered a title yet, doing so early allows your legal team to identify any issues before you're committed.
Easement Rights for Neighbours: Shared Drainage
In some situations, the easement doesn't benefit the council — it benefits a neighbouring property. This is common in areas where one property's stormwater drains through another's land to reach the street or a natural watercourse.
If your title shows a drainage easement in favour of an adjoining property, that neighbour has the right to discharge water through your land. If their drainage system fails or floods your property, the responsibility for maintenance and the extent of the easement rights depends on the specific instrument wording.
Understanding these neighbour-to-neighbour drainage arrangements before purchase is especially important in hilly or low-lying areas where stormwater management is more complex.
Frequently Asked Questions
Can I build a deck over a stormwater easement in NZ?
Generally no — not without written consent from the easement holder (usually the council). Permanent structures over easement corridors can interfere with access for maintenance and may breach the easement conditions. Some councils allow lightweight, removable structures in specific circumstances, but you should always check before proceeding.
Who is responsible for maintaining a drainage pipe on my property?
If it's a council-owned pipe covered by an easement, the council is responsible for maintenance and repair. If it's a shared private drainage system (benefiting a neighbour), the responsibilities are usually defined in the easement instrument. Check the title documents — and if in doubt, seek legal advice.
How do I find out if there's a pipe under my property that isn't on the title?
Request a LIM report from your local council — it will include known infrastructure including informal or unregistered pipes. You can also contact the council's infrastructure team directly, or ask a licensed surveyor or drainage consultant to assess the property. A Record of Title ($42.90) and Survey Plan ($49.90) together give you the formal registered picture; the LIM fills in the gaps.
