Top Bathroom Renovation Mistakes to Avoid

Planning a bathroom renovation? We love a good before-and-after moment — but we’ve also seen a few shockers in our time. From layout fails to plumbing shortcuts, there are some common missteps that can turn your dream bathroom into a bit of a... pipe nightmare.

At Torque Plumbing and Gas, we specialise in bathrooms, kitchen renovations, and new builds across Auckland, the North Shore, the Hibiscus Coast and North of Auckland area. Whether you’re diving into a full reno or making a few upgrades, here are six renovation mistakes to dodge — with tips to keep your bathroom renovation flowing smoothly.

1. Keeping Plumbing in Place… When You Really Shouldn’t

We get it — you’ve heard the age-old advice: “Don’t move the plumbing, it’ll cost more.” But here’s the thing: if your current layout is cramped, awkward, or just doesn’t work, sticking with it for the sake of saving a few grand is a false economy.

Yes, moving plumbing has a cost. But if it means gaining a better layout, more storage, a walk-in shower, or that freestanding bath you’ve been eyeing up — it’s worth it. Your bathroom renovation will be a significant investment either way, so make sure you’re getting the function and flow you really want.

Torque Tip: Only keep plumbing where it is if your layout already ticks the boxes for functionality and aesthetics. Otherwise, let us help rework the plumbing plan — it's what we do best.

2. Underestimating the True Cost

We’ve seen it time and again: a budget pulled from thin air, no product research, and then a big surprise when quotes roll in. The cost of a bathroom renovation can vary hugely based on the finishes you choose, whether you’re relocating services, and the complexity of the job.

Tiles, vanities, tapware — they all come in a huge range of price points. Then there’s labour, waterproofing, plumbing, electrical, and project management. Add a contingency of at least 10–20% for the unexpected (because something always pops up), and you’re on the right track.

Torque Tip: Start by researching product pricing and talking to your tradies early — we’re always happy to help set realistic expectations.

3. Ignoring Good Bathroom Layout Design

Trying to squeeze everything into a small bathroom? Or spreading things too far apart in a large space? Either way, poor layout planning can sabotage your renovation.

Think about flow, spacing, and functionality. Will the door swing into the vanity? Is there enough room to dry off after a shower? Are your fixtures balanced visually?

Torque Tip: A great layout can make even a small bathroom feel spacious. And we’re more than just plumbers — we can advise on layout options to help you get the most out of your space.

4. Buying Budget Tapware (and Paying for It Later)

That cheap tap might look like a bargain — but it could end up costing you big. Cheap tapware is more likely to leak, corrode, or fail completely, and if that happens while you're away for the weekend? Say goodbye to your new vanity.

Budget tapware might save a few bucks upfront, but it often comes with short warranties, limited support, and expensive consequences. Quality fixtures not only last longer, but also feel better to use, add value to your renovation, and just make your space feel... finished.

Torque Tip: Invest in reputable, well-made tapware with solid warranties. We'll help you choose fixtures that look sharp, perform flawlessly, and won’t flood your new bathroom in a year’s time.

5. Choosing the Wrong Hot Water System

If you’re upgrading to a large bath, dual showerheads, or just want better pressure (because... who doesn’t?), your existing hot water system might not cut it.

Low pressure cylinders are common in older NZ homes — and they’re not ideal for modern fittings. Upgrading to mains pressure or continuous flow can dramatically improve your shower experience and energy efficiency.

Torque Tip: We’ll assess your hot water needs and recommend the right system to match your new bathroom setup.

6. DIY Plumbing or Gas Work (Just... Don’t)

We love a confident DIYer — but plumbing and gas work are not the place to wing it. In New Zealand, it’s illegal to carry out gas fitting or certain plumbing work without certification. Beyond the legal stuff, a dodgy install can put your safety, insurance, and resale value at risk.

Torque Tip: Call in the pros. We’re certified, experienced, and we know how to get it done right.

Ready to Renovate the Right Way?

A bathroom renovation is a big deal — but it doesn’t have to be stressful. At Torque Plumbing and Gas, we help Auckland and North of Auckland homeowners design and deliver bathrooms that not only look amazing, but are built to last.

Whether you’re planning a high-end ensuite or a family-friendly upgrade, let’s make sure every detail is done right.

Get in touch today to chat about your bathroom renovation — and let’s turn your Pinterest board into plumbing perfection.