Starting your own plumbing business is one of the biggest decisions of your trade career. It offers freedom, unlimited earning potential, and the satisfaction of building something of your own — but it also comes with real responsibilities. Follow these steps in order and you'll be trading legally and professionally within a few weeks.

Is Self-Employment Right for You?

Good signs

• 5+ years hands-on experience
• Strong technical and fault-finding skills
• Comfortable dealing with customers directly
• Self-motivated — you don't need to be told what to do
• 3–6 months of savings as a buffer

Warning signs

• Less than 3 years experience
• Dislike chasing payment or handling conflict
• No savings or financial buffer
• Uncomfortable selling yourself or quoting
• Need a guaranteed weekly income

Phase 1: Licensing — Before You Do Anything Else

Step 1: Confirm Your PGDB Registration is Current

In New Zealand, you cannot legally carry out sanitary plumbing, drainlaying, or gasfitting without a current practising licence from the Plumbers, Gasfitters and Drainlayers Board (PGDB). Before going out on your own:

Verify your practising licence is current at pgdb.co.nz
Confirm your registration class covers the work you intend to do (Plumber, Drainlayer, and/or Gasfitter are separate endorsements)
Check whether you meet the Certifying Plumber threshold — you'll need this to sign off your own work without supervision

Certifying Plumber vs Registered Plumber

A Registered Plumber can do the work. A Certifying Plumber can sign off a Certificate of Compliance. If you're a Registered Plumber but not a Certifying Plumber, you'll need a Certifying Plumber to sign off your work — which creates a dependency you want to resolve before trading independently. Check your current registration class carefully.

Phase 2: Business Structure & Registration

Step 2: Choose Your Business Structure

Structure	Best For	Key Consideration
Sole Trader	Most starting plumbers	Simplest setup, personal liability
Partnership	Going into business with another plumber	Shared liability — get an agreement drafted
Limited Company	Higher-risk work or planning to grow	Limited liability, more admin overhead

Recommendation for most starting plumbers

Start as a sole trader. Simple, cheap, and you can convert to a company later as the business grows. Manage the liability risk with proper insurance.

Step 3: Register Your Business

Sole Trader:

Get an IRD number at ird.govt.nz if you don't already have one
Register for GST if you expect to earn over $60,000/year (recommended even below that threshold for credibility with commercial clients)
Register a trading name via the Companies Office if you're not trading under your own name (e.g., "Smith Plumbing Ltd" vs "John Smith")

Limited Company:

Reserve a company name at companiesoffice.govt.nz ($10.22)
Register the company ($118.74 standard)
Get a company IRD number and open a company bank account

Phase 3: Financial Buffer and Setup

Step 4: Build Your Financial Buffer

Business Setup Costs (typical)

• Tools & equipment: $5,000–15,000
• Van and fit-out: $10,000–40,000
• Insurance (annual): $2,500–5,000
• Registration & setup: $500–1,500
• Marketing materials: $500–2,000

Recommended Buffer

• 3 months personal expenses minimum
• Allow 4–8 weeks to first steady invoice
• GST account (15% of revenue set aside)
• Tax account (25–33% of profit set aside)

Recommended total savings before starting: $20,000–35,000

Step 5: Get Insured

Public Liability Insurance (essential)

• Covers damage to property or injury caused by your work
• Minimum $1M — recommend $2M for most residential and $5M for commercial work
• Required by most commercial clients and building companies
• Cost: $1,200–3,000/year

Tools & Equipment Insurance

• Covers theft or damage to your tools and van equipment
• Often bundled with commercial vehicle insurance
• Cost: $150–400/month combined with van

Professional Indemnity Insurance

• Covers professional errors — particularly relevant for design work or system advice
• Cost: $500–1,500/year

Phase 4: Equipment & Van

Step 6: Essential Tools

Day-one essentials ($4,000–8,000)

• Pipe bender and flaring tool
• Compression and press-fit tools
• Drain inspection camera
• Pressure testing equipment
• Quality hand tools and torch
• PPE (safety glasses, gloves, boots)
• Pipe threading kit

Add as you grow

• High-pressure water jetter
• Drain tracing/locating equipment
• Pipe freezing kit
• Scaffolding or safe-access equipment
• Gas leak detection equipment

Phase 5: Pricing Your Work

Step 7: Set Your Charge-Out Rate

Undercharging is the most common mistake new plumbing businesses make. Your rate needs to cover:

Direct costs

• Your own wages (target weekly take-home)
• Materials and consumables
• Vehicle running costs
• Tool replacement and maintenance

Overhead costs

• Insurance ($3,000–6,000/year)
• PGDB licence renewal
• Accounting and software
• Marketing and non-billable time (quotes, travel)

NZ market rates (2026): Residential plumbing typically $90–$130/hr + GST depending on region. Commercial work often commands $120–$160/hr. Don't undercut established rates to win work — it attracts the wrong customers.

Phase 6: Getting Customers

Step 8: Your First Customers

Don't resign without work lined up. Before launching:

Tell friends and family — referrals from people who know you are the highest-converting source of new customers
Contact local builders, bathroom designers, and property managers — these are repeat referral sources
Set up a Google Business Profile (free) — essential for local search visibility
List on Master Plumbers and local trade directories
Aim to have at least 2 weeks of confirmed work before trading day one

Phase 7: Business Systems

Step 9: Set Up Your Business Systems

Essential systems for a plumbing business

Quoting & invoicing: Professional, GST-compliant quotes and invoices — use TPT Plumber
Job scheduling: Track appointments and manage multiple jobs without a whiteboard
Compliance documentation: Digital storage of compliance certs attached to completed jobs
Accounting: Xero or MYOB for GST returns and tax — connect to your job management system
Receipt tracking: Photograph and categorise expenses immediately, not at month end

Startup Checklist

Common First-Year Mistakes

Undercharging to win work

Low prices attract difficult customers and unsustainable margins. Charge market rates from day one and compete on reliability and quality instead.

Not setting aside GST and tax

Open a separate bank account for GST (15% of revenue) and income tax (25–33% of profit) and transfer money the moment it hits your account. This is the most common cash flow trap for new trades businesses.

Invoicing weekly instead of daily

Every day you delay invoicing is a day you push payment further out. Invoice the same day the job is done.

No written quotes for larger jobs

A verbal agreement is a dispute waiting to happen. Always quote in writing — even for existing customers. It protects you and sets professional expectations.

How to Start a Plumbing Business in New Zealand