RANZ Compliance Assessment

Welcome to the RANZ Compliance Wizard

This tool helps Roofers, LBPs, and Homeowners determine their obligations under the Building Act 2004 and the LBP Rules.

Throughout this tool, you will see Case Law Alerts based on real, upheld complaints from the Building Practitioners Board (BPB) and MBIE Determinations.

Terms & Conditions of Use

1. No Data Storage or Verification: RANZ does not see, store, keep, endorse, or verify any of the information you enter into this tool. All data is processed locally on your device.

2. Membership Status: Usage of this tool does not imply that the user is a member of RANZ. Just because someone is using this application does not mean they are a RANZ member. To verify membership, you must check the official directory at ranz.co.nz.

3. Not Legal Advice: This tool is a guide based on the Building Act 2004 and BPB decisions. It is not a substitute for professional legal advice or specific guidance from your local Building Consent Authority (BCA).

4. Liability: RANZ accepts no liability for actions taken based on the outputs of this tool.

I have read and accept these Terms & Conditions.

Phase 1: What is your situation?

A. Planning & Pricing"I am planning a job. Do I need a Consent? Do I need an LBP?"

B. Doing the Work / Issues"I am on site, making changes, supervising staff, or have a dispute."

Step 1: The Job Scope

Design Changes = No Exemption [OFFICIAL SOURCE]

In Newton [2023], a roofer replaced a dormer but removed parapets. The Board ruled this was not "like-for-like". If you change the design, Schedule 1 does not apply.

What is the nature of the work?

A. New Build or ExtensionNew footprint or structural extension.

B. Like-for-Like ReplacementSame position, comparable materials.

C. Replacement with Design Changese.g. Removing parapets, changing pitch.

Step 1b: Technical Risks & Pitch

New Determinations Loaded

Includes specific logic for Pitch (Det 2018/021), Trusses (Det 2023/008), Shipping Containers (Det 2022/010) and Attic Storage (Det 2023/036).

A. Roof Pitch (Check 2016/016)

Standard Pitch (>3°)

Low Pitch (1.5° – 3°)

Flat / Zero Pitch (<1.5°)

B. High Risk Scenarios (Select ALL that apply):

Step 1d: Atmospheric Exposure

Durability by Exposure (B2)

Material, coating and fixing selection must achieve the 15-year durability requirement for the site's exposure zone (MRM COP §4.9).

What is the site's atmospheric exposure?

Sheltered / InlandLow corrosion risk, away from coast and industry.

Exposed / IndustrialHigh wind, geothermal, or industrial atmosphere.

Marine / CoastalWithin ~500m of breaking surf or salt spray.

Step 1c: Age & Durability

The 15-Year Rule

Exemption is EXCLUDED if the component failed before its 15-year durability requirement (Clause B2).

How old is the current roof?

Over 15 Years OldNormal end of life.

Under 15 Years OldPremature failure.

Step 2: Consent Status

Duty to Check [OFFICIAL SOURCE]

In Corbett-Pearson [2024], a roofer assumed a consent was in place but didn't check. The Board ruled the LBP is in the best position to stop unconsented work.

Has a Consent been issued?

Yes, Consent Issued

No - Emergency Work (s41c)Immediate danger to people/property.

Unsure / Not Confirmed

Execution: Building Type

Restricted Building Work

RBW rules specifically apply to residential buildings.

Is this a Residential building?

Yes (Owner Occupied)Standard residential rules apply.

Yes (Rental Property / Tenanted)Higher risk for ventilation (Det 2015/057).

No (Commercial / Industrial)Warehouses, offices, etc.

Execution: Making Changes

"My way is better" Trap [OFFICIAL SOURCE]

In Langdon [2025], a roofer was fined for using a "better" method without approval. In Smith [2023], product substitution was a key issue.

Are you deviating from the Plans, altering an existing configuration, or substituting products?

YesChanging flashings, details, pitch, layout, or substituting specified products.

NoFollowing the consented plans and specifications exactly.

Execution: Workmanship Details

Determination Workmanship Checks

Recent MBIE determinations (2024-2025) have set strict rules for finishing details.

Are you performing any of the following tasks? (Select all that apply)

Eaves, Fascia & GuttersFinishing metal or underlay. (Det 2024/051)

Installing FlashingsBarges, Heads, Aprons. (Det 2025/033)

Penetrations (Flues/Pipes)Installing wood burners etc. (Det 2024/036)

Product SubstitutionSwapping Brands (Membrane/Timber). (Det 2023/013)

Retrofitting InsulationAdding foam or bats. (Det 2019/002)

General Roofing / None

Execution: Substrate & Structure

Substrate Responsibility [OFFICIAL SOURCE]

In Woolhouse [2024], relying on the builder's incorrect set-out was no defence. Do not cover up non-compliant work.

Have you checked the substrate (purlins/ply/underlay) provided by previous trades?

Issues Found (Rot / Code Compliance)Rot, errors, or structure not up to current Code.

Checked & CompliantI have verified the substrate is ready.

Not Checked YetI need to verify substrate before starting.

Execution: Licence Class

Scope of Licence [OFFICIAL SOURCE]

In Casha [2025], a roofer was fined for doing work outside his specific licence class (Membrane vs Metal).

Do you hold the specific Licence Class for the material you are installing?

Yese.g. I have a Membrane licence and I am installing Membrane.

No / Different Classe.g. I am a Metal roofer installing Membrane.

Execution: Supervision

Remote Supervision [OFFICIAL SOURCE]

In Horrack [2024], the Board ruled "Remote supervision does not mean NO supervision".

How are you supervising this job?

I am doing it myself

Supervising others (Physical Checks)

Remote / No Inspection

Execution: Completion

Withholding Paperwork [OFFICIAL SOURCE]

In Moyes [2025], an LBP was fined for withholding a Record of Work due to unpaid invoices.

What is the job status?

Work in Progress (No Issues)

Job Completed Normally

Dispute / Payment Issue

Contract Terminated / Walked Off

Review your answers

Check these are right — they drive your result. Tap Back to change anything.

Client / Site Name

Job Address

Job Reference #

Date

What you need to do

The compliance call for this job.

Watch out on this job

The mistakes roofers doing this kind of work get disciplined for.

References — legislation, determinations & decisions

The logic and sources behind this assessment.