Collis Bros Plumbing
Plumbers Mosman: Expert Plumbing for Mosman’s Prestige Homess
Think you’ve got a leak? Visible or hidden, we’ll track it down!
Trusted by Mosman Homeowners — Licensed, Local and Ready
Mosman is one of Sydney’s most beautiful and sought-after suburbs, and the homes here reflect that. From grand heritage residences on sweeping harbour-view blocks to architecturally refined contemporary builds, properties in Mosman represent significant investment, and they deserve a plumber who treats them accordingly.
Collis Bros Plumbing has been working across Sydney’s Northern Beaches and harbour suburbs for years. We understand what Mosman homeowners expect: a plumber who shows up on time, communicates clearly, works carefully and gets the job done right the first time. That’s exactly what we deliver, on every visit.
Whether you’re dealing with a sudden leak, planning a full bathroom renovation or wanting to get a professional eye over your home’s plumbing before a problem develops, we’re the team to call.


Plumbing in Mosman: What Makes This Suburb Different
Mosman presents a genuinely unique mix of plumbing challenges. The suburb’s older federation and interwar homes, many of them on steep, irregular blocks, often carry original or early-replacement pipe infrastructure that can be tricky to access and tricky to diagnose without experience.
At the same time, Mosman’s strong renovation and prestige property market demands a standard of finish that goes well beyond basic compliance. Tapware, fixtures and visible plumbing work need to match the quality of the surrounding space. Cutting corners isn’t an option when the rest of the home has been immaculately finished.
Our team navigates both realities comfortably. We’re as capable of working under a 1920s sandstone home to investigate a decades-old pipe failure as we are of installing premium tapware in a freshly renovated kitchen overlooking Middle Harbour. That versatility, backed by genuine local experience, is what sets us apart for Mosman clients.
Plumbing Services We Provide in Mosman

Leak Detection and Pipe Repairs
Mosman’s older homes are particularly prone to concealed leaks, the kind that develop slowly inside sandstone walls, beneath timber floors or under century-old slab construction. By the time visible signs appear, the damage is often already significant. We use specialist leak detection equipment to pinpoint the source accurately, so repairs can be made with surgical precision rather than unnecessary demolition.
We repair leaking taps, burst pipes, cracked supply lines, shower leaks, toilet connections, under-bench plumbing and outdoor irrigation or service lines. For Mosman’s prestige homes, we always work to minimise disruption to finished surfaces and interiors.

Blocked Drains and Drainage Solutions
The beautiful established gardens that give Mosman its character come with a plumbing trade-off: large root systems that aggressively seek out any weakness in older clay or cast-iron drainage lines. Root intrusion is one of the most common drain issues we deal with in Mosman, and it rarely gets better on its own.
We carry out CCTV drain inspections to see exactly what’s happening underground, then use high-pressure water jetting to clear blockages and cut roots. Where lines are significantly damaged, we advise on the most practical repair or relining option. We don’t just unblock, we fix the underlying cause so it doesn’t keep coming back.

Toilet Repairs and Installations In Mosman
Mosman homeowners often invest in high-specification tapware and fixtures as part of broader renovation projects, European brands, designer mixers, custom-finished basin ware. Getting these right requires more than just the ability to connect a fitting. It requires care, precision and an understanding of how to work cleanly in finished spaces.
We install the full range of kitchen, bathroom and laundry fixtures for Mosman properties, working with materials supplied by the client or sourced through our trade network. Every installation is completed to the standard the fixture, and the property, deserve.

Tap and Fixture Installations
Mosman’s substantial family homes often have significant hot water demands, multiple bathrooms, larger households and the expectation of consistent, reliable supply. We service, repair and replace all hot water system types, and we take the time to recommend the right unit for the property.
For a large Mosman home, that might mean a high-capacity gas continuous flow unit, a solar system with gas backup, or a heat pump installation. We’ll walk you through the options honestly, including running costs, so you can make an informed decision.

Hot Water System Plumbing
Mosman’s substantial family homes often have significant hot water demands, multiple bathrooms, larger households and the expectation of consistent, reliable supply. We service, repair and replace all hot water system types, and we take the time to recommend the right unit for the property.
For a large Mosman home, that might mean a high-capacity gas continuous flow unit, a solar system with gas backup, or a heat pump installation. We’ll walk you through the options honestly, including running costs, so you can make an informed decision.

Kitchen and Bathroom Plumbing
Bathroom and kitchen renovations are a core part of our work in Mosman, where premium renovation projects are common and the standard expected is high. We handle everything from the rough-in stage through to final fixture installation — working alongside builders, interior designers and tilers to deliver plumbing that’s right first time.
We coordinate tightly with other trades to keep projects on schedule and ensure there are no plumbing surprises when it comes time to tile, paint or fit off. Our renovation plumbing in Mosman is precise, clean and completed to a standard that reflects the broader investment being made.
Plumbing Maintenance for Mosman Properties
For a home of significant value, reactive plumbing, waiting for something to break before calling, is a costly approach. A maintenance visit from Collis Bros Plumbing gives you a clear picture of what’s in good condition and what needs attention before it becomes a problem.
We inspect pipes, joints, taps, drains, toilets and hot water systems, assess water pressure, check for early signs of corrosion or deterioration, and provide you with a straightforward summary of findings. For Mosman homeowners managing high-value properties, including investment properties and strata, a regular maintenance schedule is one of the smartest protections you can put in place.

Why Mosman Homeowners Choose Collis Bros
From family homes to thriving local businesses, Mosman has it all. We get that a household and a commercial property have very different plumbing needs — and we tailor our work accordingly.

Plumbing residential
Mosman’s homes represent a significant investment, and maintaining their plumbing systems requires experience, care and quality workmanship. Whether it’s a minor repair or a major renovation project, we deliver plumbing solutions tailored to the needs of your home.

Commercial Plumbing
Reliable plumbing is essential for commercial properties, where disruptions can impact staff, customers, tenants and day-to-day operations. We understand the importance of professional service, clear communication and reliable outcomes in commercial environments and deliver solutions that keep properties operating smoothly.
Why Mosman Homeowners Choose Collis Bros
Choosing a plumber for a Mosman property requires confidence that the work will be completed to a high standard, with care, professionalism and attention to detail.
Care for Your Property
We work in prestige homes regularly and we know how to do so without causing damage or disruption to high-quality finishes and interiors.
Licensed and Experienced
Every member of our team is fully licensed and brings years of hands-on experience across residential, renovation and strata plumbing.
Transparent Pricing
We take the time to do the job properly. That means using quality materials, following best-practice methods and not cutting corners to get to the next job faster.
On Time, Every Time
We give accurate arrival windows and we stick to them. Your time is valuable and we treat it that way.
Workmanship Warranty
All work is backed by our warranty. If something isn’t right, we’ll make it right.
Ready to Help With Your Mosman Property
Whether it’s an urgent plumbing repair, a renovation project or a scheduled maintenance visit, Collis Bros Plumbing is ready to help. We bring genuine care and expertise to every job in Mosman, and we won’t consider the work finished until you’re completely satisfied.
Contact us today for a free quote or to book a service visit.






