- On the tools as Donza
Since 2025 - Suburbs across the lakes corridor
100100 - Licences: plumbing + gas
22 - Following the work on Instagram
4,100+4,100+
Fully licensed & insured · Backflow prevention · Thermostatic mixing valves (TMV) · certified to AS/NZS 3500 plumbing & AS/NZS 5601 gas · Donza Plumbing Pty Ltd, ABN 51 697 209 153
What we do
Homes, sites, licensed extras, after hours.
Residential
Bathrooms, hot water, taps, drains and pumps for the house you live in. Quoted before we start.
Learn moreCommercial
Fitouts, grease traps, backflow, CCTV and commercial hot water for sites that cannot wait on a house-call schedule.
Learn moreSpecialist
Licensed gas fitting, stormwater, backflow and whole-home filtration. One crew for the jobs plumbing-only operators turn away.
Learn moreEmergency
Burst pipes, sewer overflows and no hot water, quoted before we leave and attended around the clock.
Learn moreResidential
Bathrooms, hot water, taps, drains and pumps for the house you live in. Quoted before we start.
Learn moreCommercial
Fitouts, grease traps, backflow, CCTV and commercial hot water for sites that cannot wait on a house-call schedule.
Learn moreSpecialist
Licensed gas fitting, stormwater, backflow and whole-home filtration. One crew for the jobs plumbing-only operators turn away.
Learn moreEmergency
Burst pipes, sewer overflows and no hot water, quoted before we leave and attended around the clock.
Learn moreThe two halves of a bathroom job.
Drag across the same wall so you can tell it is the same room: the doorway in Newcastle, then Yarramalong from open floor to finished room under the same window, then the vanity at Lake Munmorah.
Bathroom renovation plumbing

Newcastle, the same doorway.




Straight off the tools.
Every photo below is our own work, posted as it happened.Follow the jobs on Instagram, 4,100 locals already do.






Three steps, no surprises.
From first message to compliance certificate, you always know the price and the plan before a single pipe is touched.
Hot water on the way out?Run the free 30-second hot water checkto see whether repair or replacement is the honest answer. No details required.
Send the job through
Call, or send a few details and photos. You talk to Josh, the plumber who does the work, not a call centre.
One clear price
A fixed, written price before any work starts. After-hours rates, where they apply, are agreed before we head out.
Done and certified
Licensed work to AS/NZS 3500 plumbing and AS/NZS 5601 gas, left tidy, with a compliance certificate where the job requires one.
Licensed & accountable
A plumber and a gas fitter, in one licensed crew.
In NSW, gas is licensed separately to plumbing, so Josh can legally do the gas hot water, cooktops, heaters and leak work most plumbers have to turn away. Every job is fully insured and certified to the AS/NZS 3500 plumbing & AS/NZS 5601 gas.
Licensed gas + plumbing
A licensed plumber and gas fitter. Josh can legally do the gas work plumbing-only operators are not allowed to touch.
Family-owned
Josh Bonser ran crews on large commercial sites across the Hunter before Donza. Same technical standard, smaller crew, phone answered by the person who quoted.
Upfront
A clear fixed price before we start. No call-out surprises, no padded hours.
24/7 emergency
Burst pipes, sewer overflows and no-hot-water jobs do not wait for Monday. After-hours work is quoted before we head out.
Builders, tilers and site managers
We run renovation rough-ins alongside build crews week in, week out, and take on commercial fitout work including trade waste and food-prep compliance. If you need a plumber who hits set-out dates, talk to us.
The lakes corridor is home ground.
Based in Mannering Park, still servicing Lake Munmorah and the lakes corridor, working 100 suburbs from the northern Central Coast through Lake Macquarie toward Newcastle. Not sure if you're in the zone? Ask, we're on the road daily.
Are you a licensed plumber and gas fitter?
Yes. Donza Plumbing is run by Josh, a licensed plumber and gas fitter, fully insured (Donza Plumbing Pty Ltd, ABN 51 697 209 153). The gas part matters: gas work is separately licensed in NSW, so we can legally handle gas appliances and hot water that plumbing-only operators cannot. Every job is left compliant to AS/NZS 3500 and, for gas, AS/NZS 5601.
Why does it matter that you do gas as well as plumbing?
In NSW, plumbing and gas fitting are licensed separately, and plenty of plumbers are not authorised to touch gas. Josh holds both, so for gas hot water, cooktops, heaters and leaks you get one licensed tradesperson who can do the whole job, certify it, and not subcontract the gas out. That is the work most plumbers have to turn away.
My hot water has died, repair or replace?
Under 8 years old with a failed valve or element, repair is usually worth it. Older than 10 years, or a leaking tank, and replacement is the honest answer. We quote both options and the running-cost difference, including whether a heat-pump rebate applies, so you can make the call on real numbers.
Can you handle the whole bathroom renovation?
The plumbing side of it, end to end: drainage set-out and core-holes through slab, in-wall cistern and bath rough-ins, then back for the fit-off once tiling is done. We work in with your builder and tiler, and after enough bathrooms together, we can also bring trades we already trust. It is the work our Instagram is full of.
How fast can you clear a blocked drain?
Most household blockages clear in a single visit with a jetter or drain machine. If a drain keeps blocking we run a CCTV camera through it so you know whether it is tree roots, a collapsed section or just buildup, and exactly what fixing it properly costs.
Which areas do you cover?
We're based in Mannering Park and cover Newcastle, the Central Coast, Lake Macquarie and the Hunter, still servicing Lake Munmorah and the lakes corridor. Summerland Point, Gwandalan, Budgewoi, Toukley, Woongarrah, Morisset, Swansea and the suburbs between. If you're just outside that and not sure, ask.
Do you do emergency plumbing after hours?
Yes. Burst pipes, overflowing sewers and no-hot-water jobs are quoted before we leave and attended around the clock. The after-hours rate is agreed on the phone, not after we turn up.
Can you plumb an NDIS bathroom?
Yes. Accessibility bathrooms are part of the renovation work: set-outs for hobless showers, in-wall cisterns, grab-rail backing and floor wastes that meet the layout the OT and builder are working to. We quote the plumbing against those drawings before the room is stripped.
Got a job in mind?
Call Josh, or send the job through as a message with a couple of photos. Either way you get a clear, fixed price before anything starts.





