Quick Answer
DIY if the task is legal to do yourself, you have the right tools, and a mistake won’t cause safety risks or costly damage. Call a tradesperson when the work involves electricity, gas, plumbing, load-bearing structures, asbestos, or whenever getting it wrong would cost more to fix than hiring a professional from the start. Most Melbourne homeowners save the most by DIYing cosmetic and maintenance work, and hiring licensed tradespeople for anything structural or regulated.
Every homeowner eventually faces the same question when something needs fixing: should I do this myself or call someone? DIY has real financial advantages — labour costs in Melbourne often exceed the cost of materials by a factor of three or four. But taking on the wrong job leads to wasted weekends, rectification costs, and sometimes safety risks.
This guide gives you a decision framework that actually works, with a quick-reference table by job type and honest advice on where the line is.
The Core Decision Framework
Before starting any home repair job, run it through these four questions:
- Is it legal? Electrical, gas, plumbing pipe work and structural changes require a licensed tradesperson under Australian law. No exceptions.
- Do I have the right tools — and would buying or hiring them be cost-effective? Some jobs require specialist tools (tile saw, pipe threader, scaffolding) where tool hire adds significantly to costs.
- What’s the cost of getting it wrong? Repainting a wall yourself has a low failure cost. Cutting into the wrong wall and hitting a pipe or wire has a very high failure cost.
- How long will it actually take me? A professional plumber can replace a hot water system in two hours. A motivated DIYer attempting it for the first time might take a full weekend — and still need a plumber to finish the regulated work.
Quick Reference: DIY vs Hire a Pro
| Task | DIY or Pro? | Why |
|---|---|---|
| Interior/exterior painting | DIY | No licence needed; good value for time invested |
| Tiling (floor, wall, bathroom) | DIY | Legal to DIY; worth learning for bathroom projects |
| Patching plasterboard holes | DIY | Easy with the right filler and feathering technique |
| Replacing tap washers/O-rings | DIY | Legal maintenance work; saves $150–$250 call-out fee |
| Installing flatpack kitchen/laundry | DIY | Carpentry is legal; have a plumber do final connections |
| Laying new flooring (click-lock timber/vinyl) | DIY | No licence; hire a saw if needed |
| Basic carpentry (shelves, frames, trim) | DIY | No permit for non-structural work |
| Roof insulation installation | DIY | Legal and cost-effective; follow safety rules in roof space |
| Garden landscaping and retaining walls under 1m | DIY | Generally permit-free; physical work only |
| New electrical circuits or wiring | Licensed electrician only | Illegal to DIY; fire risk; insurance implications |
| Power point installation or relocation | Licensed electrician only | Regulated work under Electricity Safety Act 1998 (VIC) |
| Split system air con installation | Licensed electrician + refrigeration mechanic | Refrigerant handling is licensed; electrical connection is regulated |
| Hot water system replacement | Licensed plumber + electrician (electric systems) | Gas and pipe connections require licensed tradespeople |
| Moving or adding plumbing pipes | Licensed plumber only | Regulated under Plumbers Licensing Act (VIC) |
| Gutters and downpipes | Licensed roof plumber (VIC) | Roof plumbing is regulated in Victoria — check your state |
| Removing a wall | Structural engineer + licensed builder | Load-bearing determination requires a professional |
| Deck under 800mm above ground | DIY possible — check council | May be permit-exempt in VIC; elevated decks need a permit |
| Asbestos removal (bonded, over 10m²) | Licensed asbestos removalist | Legal requirement in VIC; health risk |
| Pool fence installation or modification | Licensed builder + pool safety inspector | Strict compliance requirements under Building Regulations 2018 |
When DIY Is Worth It
1. Cosmetic and Surface Repairs
Painting, patching holes, caulking, grouting, sanding and refinishing timber — these are high-value DIY tasks where the learning curve is manageable, materials are cheap, and mistakes are easily corrected.
2. Maintenance Work
Cleaning gutters, replacing tap washers, oiling decks, pressure-washing driveways, rehanging doors and windows, replacing door hardware, insulation top-up — all legal, all cost-effective.
3. Garden and Outdoor Work
Landscaping, lawn care, garden beds, timber sleeper retaining walls under 1m, building garden sheds (check council for size limits), outdoor lighting using low-voltage garden systems.
4. Flatpack and Furniture Assembly
Installing flatpack cabinetry from Bunnings or IKEA is legal and straightforward. Just remember the final water connections and power points need a licensed tradie.
When to Call a Tradesperson
1. Anything Involving Regulated Trades
Electrical, gas, plumbing pipe work and structural building work. No grey area here — the law is clear, and the consequences of DIY are significant.
2. When Failure Cost is High
Before starting a repair, ask: if I get this wrong, how much does it cost to fix? Stripping a tap thread on an older chrome tap fitting might mean replacing the whole tap — a $300 mistake. Cutting into a wall to run a cable without checking for pipes or wires first could mean a $1,500 repair. Misjudging a load-bearing wall could cost tens of thousands.
3. When You Don’t Have Time to Learn Properly
Some skills — like floor tiling, plasterer’s finish or timber staining — look easy but have a significant learning curve. If you have a time constraint (a property going to market, a bathroom that needs to be functional), hiring a skilled tradie delivers a guaranteed result. You can always learn the skill on a smaller project first.
4. Insurance-Critical Repairs
Any repair related to a recent insurance event (storm damage, water leak, fire) should generally involve a licensed tradesperson so there’s a clear paper trail for the insurer. Doing unlicensed repairs on a claim property can complicate or void the claim.
The True Cost Comparison
| Job | DIY Cost | Tradie Cost (Labour + Materials) | Notes |
|---|---|---|---|
| Interior room repaint (standard bedroom) | $80–$150 | $400–$800 | DIY saves $250–$650; 1 day of work |
| Patch and paint plasterboard hole | $15–$30 | $150–$300 | Easy DIY after watching one tutorial |
| Replace tap washers (kitchen sink) | $5–$15 | $150–$250 | Legal DIY maintenance; worth learning |
| Lay click-lock flooring (40m²) | $800–$1,500 | $2,500–$4,500 | Significant saving; 1–2 days work |
| Install split system air con | Not legal to DIY | $1,200–$2,500 installed | Licensed work only |
| Replace hot water system | Not legal to DIY | $1,400–$3,500 installed | Gas + electrical connections regulated |
| Build low-level deck (25m²) | $2,000–$4,000 | $6,000–$14,000 | Large saving; physical work; check council |
| Exterior house repaint | $600–$1,500 | $3,0004–$8,000 | DIY is viable; scaffolding safety matters |