By Greg Allan, tradesman and creator of Data First Coaching
What licence or registration does a roof plumbing business need in New Zealand?
A roof plumber running a business in New Zealand usually needs two things: registration with the Plumbers, Gasfitters, and Drainlayers Board (PGDB) for any sanitary plumbing work, and a Licensed Building Practitioner (LBP) roofing licence for restricted roofing work that sits outside that plumbing registration. Which one covers a given job depends on the roof type and the work involved, from guttering and downpipe runs to a full re-roof.
The PGDB is the regulator for plumbing, gasfitting and drainlaying work in New Zealand. Its own registration policy states that “All people doing or assisting in doing sanitary plumbing, gasfitting and drainlaying must be registered and licensed, or otherwise authorised.” You apply for that registration directly with the PGDB.
Alongside PGDB registration, the Licensed Building Practitioners scheme sets out separate roofing licence classes for restricted building work. The roofing licence factsheet lists seven areas of practice for the Roofing licence, covering roof types such as concrete or clay tile, metal tile, profiled metal roof and wall, and shingle or slate.
Depending on how the business is set up, you may also look at:
- The PGDB licence class that matches the plumbing work you do
- The LBP roofing licence class that matches the roof types you work on
- A self-certification endorsement, if you want to sign off your own restricted work
Why does being a registered plumber already cover some roofing work?
Because the LBP scheme treats a registered plumber as already licensed in roofing for certain roof types, rather than making every roof plumber apply for a separate roofing licence from scratch. This recognises the flashing, box gutter and metal roof skills a plumbing registration already covers.
The roofing licence factsheet says “If you are a registered plumber or gasfitter, you are already treated as if you are licensed in roofing”, which is why many roof plumbers never apply for the separate roofing licence, though the factsheet notes you can still apply for other licence classes if your work goes beyond that. This overlap exists because the same skill set that handles flashing and sealing pipework through exterior walls also covers the installation of profiled metal roofing and cladding.
What happens if a roof plumber carries out restricted work without the right licence?
A roof plumber who takes on a re-roof, box gutter replacement or storm repair that counts as restricted building work, without holding or being properly supervised under the right licence, is operating outside the Building Act. The rules sit with the LBP scheme, administered through MBIE, separately from PGDB registration.
A discussion document on the LBP scheme notes that it is also an offence under section 314 of the Building Act for a person who is not licensed to hold themselves out as a LBP, and a separate offence under section 85 to carry out restricted building work unlicensed and unsupervised. The same document notes that the work a licensed practitioner can supervise depends on their licence type, so a plumbing registration does not automatically let a roof plumber supervise every type of restricted roofing work on a re-roof or insurance job. Separately, the PGDB's own licensing page is blunt about sanitary plumbing, gasfitting and drainlaying work done without the right practising licence.
This is general information, not legal, tax or employment advice. Check your own situation with the body named here or a qualified adviser.
Why does every compliance cost need to sit inside the price of the job, not disappear into overhead?
Because the registration, height safety planning and compliance certificate work behind a re-roof or storm job are real costs that have to be recovered from that job's price, not absorbed quietly into general overhead where they quietly eat the gross profit margin every month. The customer only sees the finished metal roof, flashing and guttering, never the registration, the height safety planning or the compliance certificate behind it, so that value has to be built into the quote, not assumed.
Whether a roof plumbing business is in its foundation phase with one crew on the tools, or growing a second crew to take on more insurance work, this does not change: the gross profit margin on re-roof and box gutter jobs is the number to protect and grow every month, not a figure worked out once at quoting time and forgotten. Data first thinking means pulling that compliance and insurance cost from the business's own job and pay records, rather than estimating it from memory when a builder asks for a price on a storm job.
This is where AI agents start to matter. An AI agent is software that does a piece of office work the way you would do it yourself, with your own wording, your own prices and your own rules, instead of a generic form. For a roof plumber, that can mean an AI agent that tracks whether the compliance certificate was actually requested and signed before a job is marked complete, or one that keeps registration, insurance and height safety costs attached to the right jobs so they show up in the numbers instead of vanishing into overhead.
Where can you check the current rules?
- Roofing licence factsheet: the areas of practice for the LBP Roofing licence and how plumbing registration is treated.
- LBP scheme discussion document: offences under the Building Act and supervision limits for licensed practitioners.
- Self-certification for plumbing and drainlaying: what a self-certification endorsement requires.
- PGDB apply for registration: the starting point for plumbing, gasfitting and drainlaying registration.
- PGDB licensing page: why working without the right practising licence is against the law.
- Single registration and licensing notice consultation: the classes of registration the Board designates.
- PGDB registration policy: who must be registered and licensed to do restricted work.
- Apply for plumber, gasfitter and drainlayer: supervision requirements while working toward full registration.
How does Data First Coaching approach this?
Data First Coaching, built by Greg Allan, starts from the roof plumbing business's own job and finance data through the Trade Business Intelligence, not from a general conversation about licences. It looks at where compliance, insurance and height safety costs actually sit against each re-roof, box gutter and storm job, because that is where a quoted gross profit margin either holds up or quietly disappears. Greg teaches that customers only see the finished roof, never the registration or the planning behind it, so this cost has to be found in the numbers rather than assumed. The how of building that into a roof plumbing business's own systems is worked through inside the Academy, with members, because the Trade Business Intelligence is powered by every member who is open minded, innovative and willing to share.
