Mosman sits on the harbour, and its housing is older and grander than most. The streets that wind down toward the water are full of Federation homes, interwar mansions and California bungalows, many heritage-listed, with original bathrooms that are spacious but locked into early-twentieth-century layouts and plumbing. These homes ask for a careful hand: matching the scale of the room, working around solid masonry, and dealing with old pipework that's been there for the best part of a century. Up the hill there are also harbourside apartment blocks where we do ensuites and main bathrooms within strata, protecting the unit below. The harbour setting brings its own moisture too, so waterproofing and ventilation get full attention. We've been renovating bathrooms across the Lower North Shore for 12 years, and we run one team covering demolition, plumbing, waterproofing, electrical, tiling and the fit-off, so there's no chasing five separate contractors. We give you a fixed-price quote before we start, hold the price, and finish most bathrooms on site in around three weeks. We're a licensed NSW contractor, number 383725C, based in Liverpool and working right across Mosman. From the first measure to handover you deal with the same people, and we plan every job around what an old harbourside home hides.
We come to your Mosman home or apartment, measure the room, check the plumbing, drainage and ventilation, and talk through what you want. Then we give you a fixed-price quote that lists every fixture, tile and trade. No vague allowances, and the price holds unless you change the scope.
Once you approve the quote, we lock in the layout and finishes so nothing changes mid-job. We strip the old bathroom back, work around solid masonry and old framing, sort the floor falls, then waterproof to AS 3740 and let the membrane cure fully before tiling.
Plumbing rough-in, electrical and tiling run in the right order because one team controls the lot. In the older heritage homes that planning matters, because surprises behind the wall are common. In apartments we work to strata access hours and protect common areas.
We fit the vanity, toilet, tapware, screen, exhaust and accessories, test everything, and clean up. You get a final walk-through, your waterproofing certificate and compliance paperwork, and a bathroom ready to use the day we finish.
Most Mosman bathrooms land between $15,000 and $45,000. A cosmetic refresh, keeping the layout and updating tiles, vanity and tapware, starts from around $8,000. A full gut, where we strip back to the frame, move plumbing and rebuild, generally runs $25,000 to $45,000 depending on room size and fixtures. The grand Federation and interwar homes near the harbour often have larger bathrooms and century-old plumbing, so there's more area to tile and sometimes more to sort behind the wall, which can push a job toward the upper end. We give you a fixed-price quote up front that itemises every fixture and trade, so you know the number before we start and it won't move unless the scope changes.
Most bathrooms are finished on site in around three weeks. That covers strip-out, plumbing rough-in, waterproofing and its cure time, tiling, then the fit-off and final clean. The waterproofing membrane has to dry fully before tiling, and given the harbour humidity we make sure of that rather than rushing it. Because one team runs the whole job, the trades follow each other with no idle days. In the older heritage homes, opening up the walls can occasionally reveal extra work, and because we plan for it that doesn't blow the schedule. You get a realistic schedule with your quote and updates as the job progresses.
Yes. Waterproofing is where most bathroom problems start, and with Mosman's harbour humidity it matters even more, so we treat it as the critical stage. We waterproof to the NSW standard AS 3740, apply the membrane correctly across floors, walls and the shower area, size the exhaust well, and let it cure fully before tiling. You get a waterproofing certificate at handover. Mosman has many heritage-listed homes, and if your job affects a protected element or involves structural change we'll tell you exactly what's required and handle the paperwork. For apartments we work within your strata by-laws.
We're a family-run business that's been renovating bathrooms across the Lower North Shore for 12 years, and we're a licensed NSW contractor, number 383725C. The advantage is one team handles the whole job, from demolition through to the final silicone, so you're not coordinating a plumber, a tiler, an electrician and a waterproofer and hoping they turn up in order. That matters in older Mosman homes where surprises behind the wall are common and one team can adapt on the spot. We quote a fixed price, hold it, and finish most bathrooms in around three weeks. You deal with the same people from the first measure to the final handover.
InsideOut Joinery & Renos is a family-run custom joinery and renovation business based in Liverpool, Sydney NSW 2170, serving homeowners Sydney-wide. Call 02 5000 0402 or email info@insideoutjoinery.au. One team covers every trade, with a typical 3-week turnaround, trade-cost appliances and 12 years of experience. Licensed contractor — licence 383725C, ABN 62 912 909 739.