New Zealand case law
Find a judgment by citation, or research a point through the cases. Follow citations and treatment to see how an authority appears in later decisions.
A legal research library for New Zealand
New Zealand judgments, legislation, and the cases that connect them. A database for the work of finding, reading, and assessing authority.
Inside the libraryFind a judgment by citation, or research a point through the cases. Follow citations and treatment to see how an authority appears in later decisions.
Search New Zealand legislative provisions and find the cases that discuss or interpret them. Read the provision alongside the relevant authority.
Research England & Wales judgments where they may assist a New Zealand argument.
Persuasive authority for NZ practice. Privy Council decisions on NZ appeals have a different status.
A case has a history
An earlier decision may lead you to a later one. Res Ipsa surfaces that relationship and links to the judgment that needs your attention.
Criminal
01 / 05Sentencing · Guilty pleas
[2009] NZCA 450 · Court of Appeal
A change on appeal. The citation record points to the Supreme Court judgment. Read it to assess what remains of the earlier approach.
Commercial
02 / 05Contractual interpretation
[2021] NZSC 85 · Supreme Court
Distinguished in a later case. The record links Bathurst to Ecomi. Follow the later reasoning to assess the distinction and its relevance to your dispute.
The next judgment to read
Ecomi Technology Pte Ltd v MB Technology Ltd[2024] NZCA 47 · Court of Appeal
Family & trusts
03 / 05Trust powers · Relationship property
[2016] NZSC 29 · Supreme Court
A later distinction to examine. The citation record identifies Da Silva as distinguishing Clayton. Read the judgments together to assess the reach of the earlier authority.
Employment
04 / 05Employment Relations Authority jurisdiction
[2021] NZSC 102 · Supreme Court
Applied in a later decision. Follow the jurisdiction test from the Supreme Court to its application in Foster v Wilson.
Environment
05 / 05Planning policies · Resource consents
[2014] NZSC 38 · Supreme Court
A distinction in subsequent treatment. The record points to R J Davidson Family Trust. Read the later judgment to consider how King Salmon bears on your planning question.
The next judgment to read
R J Davidson Family Trust v Marlborough District Council[2018] NZCA 316 · Court of Appeal
The reading room is wherever you are
Use the web library directly, or bring the database into your existing AI assistant. Both are included in your subscription.
Search judgments, open the source, and review recent additions. Follow case links from your research and read the judgment in the library, including on your phone.
Open the libraryConnect your Res Ipsa account, then ask Claude to research New Zealand cases and legislation. Results include case links that take you back to the library.
Connect to ClaudeConnect your Res Ipsa account to research the database through ChatGPT. Follow the linked judgments to read the sources and assess their relevance.
Connect to ChatGPTAI connector availability depends on your provider’s plan and workspace settings. AI subscriptions are separate.
A note on research privacy. Res Ipsa does not retain search-query content. Query-free access logs support security and billing. Your AI provider’s data terms apply separately.
Privacy policyProfessional access
The web library and AI connectors are included.
Choose the way you prefer to work.
14 days free. Payment method required. Your selected paid subscription starts when the trial ends unless you cancel. Any applicable taxes are shown at checkout.
Your AI assistant’s subscription, if required, is separate.