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Res Ipsa

A legal research library for New Zealand

The law.
The context.
Your assessment.

New Zealand judgments, legislation, and the cases that connect them. A database for the work of finding, reading, and assessing authority.

Inside the library
Available in the library · Claude · ChatGPTFor New Zealand legal professionals

The contents

Primary materials.
Their subsequent treatment.
A place to read both.

Explore access
01

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.

02

Legislation & interpretation

Search New Zealand legislative provisions and find the cases that discuss or interpret them. Read the provision alongside the relevant authority.

03

Comparative 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

The citation is
a starting point.

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 / 05

Sentencing · Guilty pleas

Hessell v R

[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.

The next judgment to read

Hessell v R

[2010] NZSC 135 · Supreme Court

Example from our database · 5 September 2026.
Treatment signals point to further reading; their scope depends on the judgments we hold.

Commercial

02 / 05

Contractual interpretation

Bathurst Resources Ltd v L&M Coal Holdings Ltd

[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

Example from our database · 5 September 2026.
Treatment signals point to further reading; their scope depends on the judgments we hold.

Family & trusts

03 / 05

Trust powers · Relationship property

Clayton v Clayton (Vaughan Road Property Trust)

[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.

The next judgment to read

Da Silva v Da Silva

[2016] NZHC 2064 · High Court

Example from our database · 5 September 2026.
Treatment signals point to further reading; their scope depends on the judgments we hold.

Employment

04 / 05

Employment Relations Authority jurisdiction

FMV v TZB

[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.

The next judgment to read

Foster v Wilson

[2022] NZHC 1955 · High Court

Example from our database · 5 September 2026.
Treatment signals point to further reading; their scope depends on the judgments we hold.

Environment

05 / 05

Planning policies · Resource consents

Environmental Defence Society v NZ King Salmon

[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

Example from our database · 5 September 2026.
Treatment signals point to further reading; their scope depends on the judgments we hold.

The reading room is wherever you are

Choose your way in.

Use the web library directly, or bring the database into your existing AI assistant. Both are included in your subscription.

A place for close reading.

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 library

NZ authority, in Claude.

Connect 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 Claude

NZ authority, in ChatGPT.

Connect your Res Ipsa account to research the database through ChatGPT. Follow the linked judgments to read the sources and assess their relevance.

Connect to ChatGPT

AI 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 policy

Professional access

One subscription.
Both ways to research.

The web library and AI connectors are included.
Choose the way you prefer to work.

Full plan details

Monthly

NZ$59/ month

Annual

NZ$590/ year

Start 14-day free trial

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.