Renovations are exciting, but they can go sideways fast. Most problems come from a few common mistakes: unclear plans, rushed decisions, and changes mid-job.
Here are the big ones—and what to do instead.
1) Starting without a clear scope
What it looks like:
“Let’s just start and we’ll decide as we go.”
Why it’s a problem:
If the plan keeps changing, the cost and timeline usually blow out.
Do this instead:
Write a simple scope list:
- what stays
- what gets replaced
- must-haves vs nice-to-haves
- your maximum budget limit
Even one page helps.
2) Choosing the cheapest quote without checking what’s included
What it looks like:
One quote is much lower, so you pick it.
Why it’s a problem:
Sometimes it’s cheaper because key items are missing (rubbish removal, waterproofing details, painting, patching, fittings).
Do this instead:
Compare quotes line by line. Look for:
- exact materials and brands (or clear allowances)
- what is excluded
- who pays for disposal and protection
- how variations (changes) are charged
3) Not having a written contract (or not reading it)
What it looks like:
Everything is agreed “over text” or verbally.
Why it’s a problem:
If there’s a dispute later, it gets messy fast.
Do this instead:
Get it in writing:
- scope
- payment stages
- start/finish expectations
- warranty/defects process
- what happens if products are out of stock
Australia has consumer protections, but paperwork still matters.
Source (general consumer rights): [3]
4) Underestimating lead times (tiles, cabinets, appliances)
What it looks like:
You order products after demolition starts.
Why it’s a problem:
Trades can’t finish without materials. Delays can leave you without a working kitchen or bathroom.
Do this instead:
Choose and order key items early:
- cabinets
- benchtops
- tiles
- appliances
- tapware
5) Changing your mind mid-job
What it looks like:
Switching tiles, moving a sink, changing lighting after rough-in.
Why it’s a problem:
Changes often mean rework. Rework costs money.
Do this instead:
Make the big decisions before work begins:
- layout
- electrical plan (lights and power points)
- plumbing locations
- tile set-out (how tiles line up)
6) Skipping proper waterproofing details in wet areas
What it looks like:
Rushing a bathroom or laundry and hoping it’ll be fine.
Why it’s a problem:
Water damage is expensive and stressful. Waterproofing is one of those things you can’t “see”, but you will definitely feel it later if it fails.
Do this instead:
Ask what waterproofing system is being used, and what checks happen before tiling. In Australia, wet-area work needs to meet building requirements under the National Construction Code framework.
Source: [4]
7) Not planning enough ventilation
What it looks like:
No decent exhaust fan in the bathroom, or weak rangehood in the kitchen.
Why it’s a problem:
Steam and cooking grease cause mould, peeling paint, and bad smells.
Do this instead:
Plan ventilation as part of the renovation, not an afterthought.
8) Forgetting about the “in-between” areas
What it looks like:
New kitchen looks great… but the old floor next to it looks terrible.
Why it’s a problem:
Kitchens and bathrooms connect to other spaces. The edges show.
Do this instead:
Check transitions:
- flooring height changes
- skirting boards
- paint lines
- door trims
- matching finishes
9) No contingency budget
What it looks like:
Budget is tight with no buffer.
Why it’s a problem:
Surprises happen in renovations—especially in older homes.
Do this instead:
Keep a buffer (often 10–15%) if possible, especially for full renos.
10) Ignoring asbestos risk in older homes
What it looks like:
Demolishing old sheeting without checking what it is.
Why it’s a problem:
Asbestos can be present in many Australian homes built before 1990, and it’s hazardous when disturbed.
Source: Safe Work Australia. [5]
Do this instead:
If your home is older, treat it seriously. Get advice/testing before demolition.
11) Poor communication during the build
What it looks like:
You don’t know what’s happening, and the builder doesn’t know what you want.
Why it’s a problem:
Small misunderstandings become expensive mistakes.
Do this instead:
Have a simple weekly check-in:
- what was done this week
- what’s next
- what decisions are needed from you
12) Not doing a proper handover checklist
What it looks like:
Job “finishes” but you haven’t checked details.
Why it’s a problem:
Tiny issues are easiest to fix straight away.
Do this instead:
Walk through and check:
- doors and drawers line up and close smoothly
- taps and drains don’t leak
- lights and power points work
- silicone lines are neat
- paint touch-ups are done
A quick “avoid mistakes” renovation checklist
Before you start, make sure you have:
- a written scope
- your selections chosen (or clearly allowed for)
- a realistic budget + buffer
- a simple timeline plan
- agreement on how changes are handled
- a final handover checklist
If you’d like help planning a renovation with fewer surprises, you can reach out to Kitchen Bathroom Renovate Service here: https://kitchenbathroomrenovate.com.au/
