When to DIY and When to Call a Tradie — A Practical Guide

There's a certain satisfaction that comes with fixing something around the house yourself. A dripping tap, a scuffed wall, a wobbly fence paling — sorting it out on a Saturday morning with a cup of tea afterwards feels genuinely good. But there's a line between a satisfying weekend project and a job that's going to end up costing you more time, money, and stress than if you'd just picked up the phone in the first place.

Knowing where that line sits isn't always obvious. Some jobs look simple but hide real complexity. Others look intimidating but are actually well within reach for anyone with basic tools and a bit of patience. This guide walks through the most common categories of home maintenance and improvement, and helps you figure out what's worth having a crack at — and what's best left to someone who does it for a living.

Plumbing

Plumbing is one of those areas where the DIY line is pretty clear, and it pays to respect it.

Fine to DIY:

• Replacing a worn washer in a dripping tap — turn off the toby first, and you're sorted
• Unblocking a slow drain with a plunger or drain cleaner
• Replacing a shower head or hose
• Swapping out a toilet seat
• Cleaning out the trap under a sink

Call a plumber:

• Anything connected to the mains water supply
• Hot water cylinder work — these systems are under pressure and at temperature, which is not a combination you want to experiment with
• Installing or moving any fixtures (new basin, toilet, shower)
• Blocked drains that won't clear with basic methods — a plumber with a camera and hydro jetter will sort it properly
• Any work involving pipes in walls or under the floor

A good rule here: if water is flowing and you're not sure where it's going, stop and call someone. Water damage from a bodged plumbing job can be extensive and miserable to deal with.

Electrical

Electrical work in New Zealand is not a grey area. Almost all of it must be done by a registered electrician — a sparky, in plain English.

Fine to DIY:

• Changing a lightbulb (obviously)
• Replacing a broken plug on an appliance cord
• Resetting a tripped circuit breaker at the switchboard

Call a sparky:

• Adding or moving a power point
• Installing a new light fitting — even if it seems like a straight swap, if it involves wiring, it needs a sparky
• Running cable for anything — data, power, lighting
• Any work in the switchboard
• Installing a rangehood, heated towel rail, or bathroom fan
• Basically anything beyond changing a bulb or a plug

This isn't about skill — it's about safety. Electrical faults cause fires, and poorly done wiring can sit behind a wall for years before something goes wrong. A sparky will also provide a certificate of compliance, which matters if you ever sell the house.

Painting

Painting is probably the most accessible DIY job going, but there's a big gap between rolling a feature wall in the lounge and tackling the exterior of a two-storey weatherboard.

Fine to DIY:

• Interior walls and ceilings in single-storey rooms — good prep, decent brushes and rollers, and quality paint go a long way
• Painting a fence or garden shed
• Touching up scuffs and marks
• Staining or oiling a deck (as long as you prep the timber properly first)

Call a painter:

• Exterior work on multi-storey homes — working at height is dangerous, full stop
• Weatherboard prep that involves scraping, sanding, and priming old lead paint — this needs to be handled carefully
• Spray-painting large areas — the gear is expensive and the technique takes practice
• Wallpapering, especially feature walls with pattern matching — a professional will get it straight and bubble-free
• Any surface with significant damage that needs filling, sanding, or plastering before paint goes on

If you do paint yourself, don't skimp on the prep. Ninety percent of a good paint job is what you do before the brush touches the wall.

Tiling

Tiling sits in an interesting spot. A small, straightforward job is manageable for a careful DIYer. Anything involving waterproofing or complex layouts is a different story.

Possible to DIY:

• A simple kitchen splashback on a flat wall — especially with modern adhesive tile mats
• Replacing a single cracked tile if you can source a match
• Re-grouting a small area that's gone manky

Call a tiler:

• Bathroom floors — they need proper waterproofing underneath, and getting the fall right so water drains correctly is critical
• Shower recesses and wet areas — waterproofing failures here lead to rotten framing and serious problems down the track
• Large-format tiles — these are heavy, unforgiving, and need an even substrate
• Any tiling over existing tiles or uneven surfaces

A DIY tiling job that looks a bit rough is one thing on a splashback. In a shower, it can mean leaks you won't notice until the damage is done.

Decking and Fencing

Kiwis love a good deck, and plenty of us have put up a fence or two. Some of this work is well within DIY territory, but structural jobs need a builder.

Fine to DIY:

• Replacing a broken fence paling or two
• Re-nailing or screwing down a loose deck board
• Sanding and re-oiling a deck
• Building a simple garden planter box
• Minor gate repairs — rehinging, adjusting a latch

Call a builder:

• Building a new deck from scratch — especially if it's elevated, attached to the house, or needs a building consent
• Replacing fence posts — getting them straight, plumb, and properly set in concrete matters for the life of the fence
• Any retaining work — even a low retaining wall is structural and needs to be done right
• Building a pergola or any overhead structure

If you're looking at the job and thinking "I might need to check if this needs a consent," that's usually a sign you want a professional involved from the start.

Roofing

This one is simple: don't get on your roof.

It doesn't matter if it's a single loose tile, a small leak, or a gutter that needs clearing. Roofing work is dangerous. Falls from height are one of the most common causes of serious injury around the home, and a residential roof — especially when it's wet, mossy, or steep — is not a safe place for someone without the right gear and training.

A roofer will have harness systems, proper ladder setups, and the experience to move around safely up there. They'll also spot issues you might miss, like lifting flashings, deteriorating sarking, or fixings that are starting to rust out.

Even cleaning the gutters is worth getting someone in for if it means climbing a ladder to roof height. It's just not worth the risk. Call a Tradie

Gas

Another non-negotiable one. All gas work must be done by a registered gasfitter. No exceptions. Call a Tradie

This covers everything:

• Installing or disconnecting a gas hob, oven, or heater
• Running or modifying gas lines
• Connecting a new gas hot water system
• Fitting a gas bayonet point for a portable heater
• Even swapping a gas bottle on a permanently plumbed BBQ setup, if it involves the fixed pipework

Gas leaks can be fatal. There's no DIY version of this. If you can smell gas, open windows, don't touch any switches, get out of the house, and call your gas provider's emergency line.

A General Rule of Thumb

If you're trying to decide whether a job is DIY or tradie territory, ask yourself a few honest questions:

• Could I hurt myself or someone else if I get this wrong? If yes, call a professional.
• Could a mistake cause hidden damage — water getting into the framing, wiring shorting behind a wall, a structure that's not quite sound? If yes, call a professional.
• Do I actually have the right tools? Buying or hiring specialist gear for a one-off job often costs more than getting someone in who already has it.
• Am I going to enjoy this, or am I going to be swearing at it by lunchtime? Life's short. Some jobs are satisfying. Others are just a battle. Be honest about which category yours falls into.

There's no shame in calling a tradie. That's literally what they do. A good one will get the job done properly, clean up after themselves, and save you a weekend of frustration. And if you've already had a crack and it's gone sideways — don't worry, they've seen it before. Just give them a call and let them sort it out.

On the flip side, don't be afraid to tackle the jobs that genuinely are within your ability. A bit of YouTube research, the right tools, and a willingness to take your time can go a long way. Start small, build confidence, and save the big jobs for the people who've spent years learning how to do them well.