Cross‑Lease Alterations: A Court of Appeal Reset Every Property Owner Should Understand.
If you own property under a cross‑lease title, chances are you will eventually run into the consent issue. It usually arises at exactly the wrong time — when you are planning renovations, looking at redevelopment, or trying to future‑proof an ageing home. In Auckland, where cross‑leases remain a feature of older residential suburbs, this issue comes up daily in property consulting, feasibility work, and dispute resolution.
A recent Court of Appeal decision has significantly changed the legal landscape around cross‑lease alterations. For owners, developers, and anyone involved in property development in Auckland or subdivision planning, the ruling brings welcome realism — but also clearer expectations about how neighbours must behave.
Why Cross‑Leases Cause So Many Property Disputes
Cross‑leases sit in an uncomfortable middle ground between full freehold ownership and shared land arrangements. You own your dwelling and have exclusive use of a defined area, but the land itself is jointly owned. That means structural changes — even within your “exclusive use” area — often require consent from neighbouring owners.
For years, those consent requirements have been a flashpoint for property disputes. From a practical standpoint, many disputes arise not because a proposal is unreasonable, but because the rules around refusal were poorly understood or misapplied.
That changed with Liow v Martelli.
The Case That Changed the Rules: Liow v Martelli
In Liow v Martelli [2026] NZCA 101, the Court of Appeal examined whether consent to cross‑lease alterations had been lawfully withheld.
The facts are familiar. Two neighbouring owners in Remuera shared a cross‑leased site. One couple proposed a fairly typical upgrade: extending their home and adding decking and a pool within their exclusive use area. Their neighbours objected, raising concerns about bulk, proximity, loss of amenity, and potential property value impacts.
At first instance, an arbitrator applied the long‑standing test from Smallfield v Brown (1991), which many property consultants and advisers have relied on for decades. Under that test, consent could only be unreasonably withheld if the benefit to the applicant was substantial and the detriment to the neighbour was trifling. The arbitrator upheld the refusal.
The High Court disagreed. The Court of Appeal went further.
The End of the Smallfield Test
The Court of Appeal made it clear: the Smallfield v Brown test is no longer the law.
Instead, the correct question is far more practical and grounded in reality:
Would a reasonable joint lessor, properly considering the interests of all parties and the context of the cross‑lease, be entitled to withhold consent in these circumstances?
There is no mathematical formula. No need to prove “trifling” effects. No automatic entitlement to build just because a proposal adds value. The focus is on reasonableness, proportionality, and shared ownership obligations.
From a property dispute advice perspective, this is a much healthier framework.
Consent Is Not a Personal Veto
One of the most important — and often misunderstood — aspects of the decision is who actually gives consent.
The Court confirmed that consent is given collectively by the lessors, not individually by each owner acting solely in their own interests. A single neighbour saying “no” does not automatically amount to a lawful refusal.
If owners cannot agree, the cross‑lease document’s dispute resolution process — typically arbitration — must be used. That process exists for a reason. Ignoring it or attempting to exercise a personal veto is unlikely to withstand scrutiny.
For anyone involved in property development in Auckland, particularly small‑scale redevelopment or subdivision of cross‑leased land, this distinction is critical.
What “Reasonable” Now Looks Like
Rather than imposing rigid rules, the Court offered guidance on how reasonableness should usually be assessed.
A reasonable cross‑lease decision involves:
- Considering the interests of all owners, not just your own
- Setting aside unrelated grievances or historic personality conflicts
- Acting proportionately, recognising that compromise is inherent in shared ownership
- Accepting that properties must evolve over time
Relevant considerations may include:
- Privacy and physical intrusion
- Impacts on another owner’s future development potential
- Effects on market value
- Current planning controls
- Modern expectations around residential living
These are matters property consultants, architects, and project managers in Auckland already assess routinely when advising on feasibility and risk.
Long‑Term Reality Finally Acknowledged
Cross‑leases often run for 999 years. The Court recognised what anyone involved in subdivision or redevelopment understands instinctively: it is unrealistic to freeze buildings in the form they had decades ago.
Ageing housing stock, changing building standards, and intensification pressures mean alterations are not optional — they are inevitable. The law must allow sensible evolution while still managing neighbour impacts fairly.
This acknowledgment makes the decision particularly relevant for property development in Auckland, where redevelopment pressure is only increasing.
Practical Takeaways for Owners and Developers
For owners proposing alterations:
- Engage early and transparently
- Present a clear, well‑designed proposal
- Use the cross‑lease dispute process if consensus cannot be reached
For objecting owners:
- Be clear, principled, and proportionate
- Understand that some impact does not equal unreasonable development
- Engage constructively rather than defensively
For developers, project managers, and consultants:
- Cross‑lease issues must be addressed early in feasibility assessments
- Consent risk is manageable — but only if properly understood
- Early property consulting saves time, cost, and litigation exposure later
Final Thoughts
Liow v Martelli resets cross‑lease law to something far closer to everyday reality. It replaces rigid, outdated tests with a commonsense assessment of reasonableness — while still protecting legitimate neighbour interests.
Cross‑leases demand cooperation. This decision reinforces that obligation, and gives courts and arbitrators clearer authority to intervene when cooperation breaks down.
If you are facing a cross‑lease dispute, planning renovations, or assessing redevelopment or subdivision options, early property dispute advice can significantly reduce risk and cost.
Aamsko provides property consulting, expert property dispute advice, project management services across Auckland, and strategic guidance for property development and subdivision projects.