How to Start a Plumbing Business in Ireland

Starting a plumbing business in Ireland as a sole trader is straightforward - but there are specific regulatory requirements you need to have in place before taking on work, particularly for gas installations.

This guide covers everything: RGII registration, insurance, Revenue setup, and the practical steps to start trading professionally from day one.

Do you need to be registered to work as a plumber in Ireland?

For general plumbing work - water supply, drainage, heating systems not involving natural gas - there is no mandatory registration body in Ireland. Any competent tradesman can carry out water and drainage work.

For gas installation and servicing, registration with RGII is a legal requirement.

RGII registration - what it is and how to get it

RGII (Register of Gas Installers of Ireland) is the body that authorises contractors to carry out natural gas and LPG installation and servicing work in Ireland. Operating as a gas installer without RGII registration is illegal.

To register with RGII, you need:

• Appropriate gas qualifications (City and Guilds, FETAC/QQI, or equivalent recognised qualification)
• Proof of insurance (public liability and employers liability if applicable)
• A completed application to RGII
• Payment of the RGII registration fee

RGII registration must be renewed annually. Registered contractors are listed on the RGII database, which customers can check to verify your registration before hiring you.

If you are not yet qualified for gas work, you can operate as a general plumber covering water, drainage, and heating (non-gas) while you complete your gas qualifications.

SEAI registration for heat pump and energy upgrade work

If you want to carry out grant-funded work under SEAI (Sustainable Energy Authority of Ireland) schemes - such as heat pump installation or BER-related upgrades - you need to be registered as a contractor with SEAI.

SEAI contractor registration requires relevant qualifications (for heat pumps: a specific heat pump installer qualification), an active RGII registration where gas work is involved, and public liability insurance. Register through the SEAI contractor portal.

SEAI-funded work is growing rapidly in Ireland. Getting registered opens up a significant source of work that non-registered plumbers cannot access.

Insurance: what you need before taking on any work

Public liability insurance is not legally required for plumbers in Ireland, but in practice it is essential:

• RGII requires it as a condition of registration
• Most commercial customers (management companies, landlords, contractors) require proof of insurance before engaging you
• A single water leak claim can exceed the value of many years of income

The standard minimum for plumbing work in Ireland is €6.5 million public liability coverage. Some commercial jobs require more. Get a policy specifically designed for plumbing and heating contractors - general tradesman policies sometimes exclude specific risks like gas work.

If you employ anyone, even temporarily, you are legally required to have employers liability insurance.

Revenue registration: tax and VAT

Register as self-employed with Revenue through myAccount (Form TR1). This registers you for income tax, PRSI (Class S), and USC. See the full guide on how to register as self-employed in Ireland.

For VAT: most plumbing services on buildings are subject to the 13.5% reduced rate. You must register for VAT if your annual turnover exceeds €40,000. See our guides on VAT rates for plumbers in Ireland and the VAT registration threshold.

Registering a business name

If you trade under a business name (for example, “Murphy Plumbing and Heating”) rather than your own full name, you must register that trading name with the Companies Registration Office (CRO). This costs €20 online. It does not create a limited company - you remain a sole trader.

Opening a business bank account

Not a legal requirement for sole traders in Ireland, but strongly recommended. A separate business account makes VAT returns, tax returns, and daily bookkeeping dramatically easier.

What you need before your first job

A practical checklist before taking on paying work:

• Revenue registration (self-assessment + VAT if needed)
• RGII registration (if you will do gas work)
• Public liability insurance certificate
• Professional invoicing - every job needs a proper invoice
• A way to take payment (bank transfer details on every invoice)
• A trade account with your main supplier (this unlocks trade pricing)
• A Google Business Profile, so customers searching “plumber” plus your area can actually find you

The most common thing new sole traders delay is the invoicing and paperwork side. It is worth setting this up before the first job, not after the first awkward conversation with a customer who wants a receipt. The other thing worth doing early is setting up your free Google Business Profile - it is what puts you in front of customers who do not already know your name.

Quoting and invoicing as a plumber

Every plumbing job should have a written quote before work starts and a proper invoice after. The quote protects you from price disputes. The invoice is your legal payment demand and your evidence if a payment goes overdue.

See our guides on how to quote a boiler replacement, how to quote a bathroom installation, and how to write a scope of works.

Download a free plumber invoice template for Ireland, or get early access to PayReady - it's free. PayReady generates professional plumbing quotes and invoices from your phone with the correct 13.5% VAT rate pre-set.

Summary: starting a plumbing business in Ireland

1. Get RGII registered if you will carry out gas work
2. Take out public liability insurance (minimum €6.5m)
3. Register as self-employed with Revenue (Form TR1)
4. Register for VAT if turnover will exceed €40,000
5. Register a trading name with the CRO if using a business name
6. Open a business bank account
7. Set up professional invoicing before the first job