Trade 27 of 33Updated May 2026

A research dossier · 41 NSW + 32 QLD + 31 VIC homeowner posts · HBC + DBI rules verified per state

Hiring a Renovation Builder
is where the scope
creeps you to NCAT.

Renovations sit between handyman jobs and luxury custom builds — and they have the worst contracts. The cowboy renovation builder quotes you for the visible work + writes "variations to be agreed on the day" into the scope. Six months in, you've approved 14 variations + the budget is 40% over, the bathroom isn't finished + you're three months past the original handover date.

10%

Legal maximum deposit. Same as new builds.

25–40%

Budget blow-out common when variations aren't capped.

5–8

Sub-trades a typical kitchen reno coordinates.

How this page was built

A research dossier, not a referral page.

Sources

Reddit + Whirlpool, ProductReview, NSW Fair Trading + HBC, QBCC, VBA, HIA/MBA standard contracts.

Verification

Pricing cross-checked across NSW, QLD, VIC current renos. Deposit + progress payment rules verified per state statute.

Funding

No builder pays for placement. No referral fees. Funded by the supply-side flyer service at flyers.needatrade.com.au.

Before we start

Renovations live or die on the
variation rule.

Every renovation has hidden defects. Pull off the kitchen splashback + you find water damage. Open the bathroom wall + you find old pipes that don't meet code. Lift the floorboards + you find rotted joists. The question isn't whether variations will happen — it's what the rule is when they do.

The 10 questions below pull the variation rule into the open before you sign. A working renovation builder caps the variations, names the trigger conditions, and writes the rule on the contract. A cowboy says "we'll see what we find" — and you sign up to whatever happens.

A renovation contract without written variation rules is a blank cheque. Don't sign it.

How much should it really cost?

Seven lines a real renovation quote shows

1Demolition. What gets removed + how. Tip fees + asbestos contingency.
2Structural work. If walls move + lintels + framing. Engineering certificate.
3Sub-trades. Sparky, plumber, tiler, plasterer, painter, cabinet-maker — each named + scoped.
4Materials + fixtures. Inclusions list with brand + model + supplier. PC + provisional sums spelled out.
5Variation rules. What's open. What triggers a re-quote. $ ceiling on open items. Written.
6Progress payments. Tied to milestones (demo done / structural done / lock-up / final fix / handover). Written.
7Contingency. 10–15% recommended on top of quoted scope. Anyone quoting without contingency is hiding it elsewhere.

Indicative ranges

AU 2026

Bathroom reno (mid-tier · fixtures + tile)	$25k – $45k
Bathroom reno (premium · stone + double vanity)	$45k – $85k
Kitchen reno (mid-tier · same footprint)	$30k – $55k
Kitchen reno (premium · stone + custom)	$55k – $120k
Extension (20m² · single-storey · roughed)	$80k – $180k
Full house reno (150m² · mid-tier)	$400k – $900k+

Indicative. Heritage, steep block, structural changes, premium fixtures = upper end. Plus 10–15% contingency.

Ask this, exactly

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"Can you send the inclusions list, the PC / provisional sums with $ caps, the variation rule with $ ceiling, and the progress-payment schedule — all in writing?"

How to tell a real one from a cowboy.

Red flags — in order of how often you'll meet them

!
"Variations to be agreed on the day"
The single most predictive line of a budget blow-out. A working renovation builder caps the variations in writing.
!
Deposit over 10%
Same statutory maximum as new builds. Anything more is illegal.
!
No HBC / Home Warranty / DBI
Above state thresholds, the certificate must exist in your name before deposit. No certificate = your money has no statutory protection.
!
No sub-trade names
"My usual sparky" + "my regular tiler" without names = you don't know who's touching your house, and you can't verify their licences.
!
Vague progress-payment schedule
"Progress payments as work proceeds" is a blank cheque. Milestones must be specific: demo done = payment 1, structural done = payment 2, etc.

The verification routine — 30 minutes, free

✓
Builder's licence + class. The right class for residential renovation.
✓
HBC / Home Warranty / DBI issued in your name before deposit.
✓
ABN + ACN + ASIC. Phoenix-company check. Director history.
✓
Three recent reference renos. Drive past one. Call one owner.
✓
Independent solicitor reviews the contract. Yours, not the builder's.

Ask this, exactly

"Can you send your licence, HBC/HW/DBI policy in my name, three reference renos, and the named sub-trades + their licences?"

What certificate should you receive?

NSWNew South Wales

NSW Fair Trading + HBC

Builder's licence — residential class.
HBC over $20k. In your name before deposit.
Max deposit: 10%.
HIA / MBA standard contract above $20k.

QLDQueensland

QBCC

QBCC licence — Builder Low-Rise or higher.
Home Warranty over $3,300.
Max deposit: 10% on most residential.
Cooling-off period applies.

VICVictoria

VBA

Registered builder — Domestic Builder Limited / Unlimited.
DBI over $16k.
Max deposit: 10% ($10k–$20k) / 5% ($20k+).
Domestic Building Contracts Act applies.

Half-time

No variation cap. No HBC. No deal.

Quote anatomy, the cowboy test, the certificates. The first three sort the working renovation builders from the scope-creep operators. The next seven are how working renovators tell themselves apart — and how you avoid NCAT.

When can they actually start?

Renovation builders typically 6–16 weeks out. Permits + insurance certificates add 4–8 weeks upfront. The "I can start next month" builder is either the right operator with a cancellation, or the wrong operator with no other work.

Real start.

Conditional on permits + HBC + contract. 8–16 weeks from first contact realistic.

Real duration.

Bathroom: 4–6 weeks. Kitchen: 6–10 weeks. Extension: 12–24 weeks. Full house: 6–12 months.

Liquidated damages.

Contract specifies what the builder owes per day if they're late through their own fault. Working builders accept it.

Ask this, exactly

"What's a realistic duration for this scope, and what's the liquidated damages clause if you're late through your own fault?"

What happens next, step by step.

1Phase
Design + scope
Either you supply drawings or design-build option. Inclusions list developed.
2Phase
Tender + selection
Three builders quote the same documents. Compare on like-for-like, not headline price.
3Phase
Contract + HBC + 10% deposit
Solicitor reviews. HBC / DBI certificate issued. Variation rules + progress-payment schedule in writing.
4Phase
Pre-start + permits
CDC / DA / building permit lodged. Final selections (tile / paint / fittings). Pre-start meeting.
5Phase
Demo + structural + sub-trades
Phased work. Each progress claim signed off by you before payment. Variations in writing before they're done.
6Phase
Defects + handover
Pre-handover walkthrough. Defects list. 13-week defects period. Final 5% withheld until rectified.

Design-build or build-only?

Option A · single point of contact

Design-build

Builder takes you from concept through build. Architect or designer is part of the builder's team or sub-contracted.

Right when: no architect engaged, want one point of contact, prefer integrated design + cost discipline.

Wrong when: you want independent design check + competitive build pricing.

Option B · tendered

Build-only

Architect designs. Builder tenders. Builder constructs to the architect's drawings. Two professionals coordinate.

Right when: architect-led project, want competitive build tender, premium/complex job.

Wrong when: simple bathroom / kitchen — design-build often more efficient.

Warranty — same five layers as a new build.

Layer 01
Statutory structural
6 years (NSW · VIC) / 6.5 years (QLD) on structural work.
Layer 02
Statutory non-structural
2 years (NSW · VIC) / overlapping with QLD cover.
Layer 03
Defects period
Builder's own — 13 weeks. Final 5% withheld.
Layer 04
HBC / HW / DBI
Insurance-backed cover if builder disappears.
Layer 05
Manufacturer warranties
Tile, fixtures, appliances, fittings — each separately warranted.

Ask this, exactly

"Could you list the five warranty layers + the 5% defects retention rule in writing?"

Hidden defects in old houses.

The mid-job variation lives in the wall cavities. Termite damage, water rot, lead paint, asbestos, old pipework that doesn't meet code — discovered during demolition or rough-in.

Pre-1990 houses
Asbestos in eaves, vinyl, wall sheeting. Licensed removal required.
Pre-1970 houses
Lead paint. Old plumbing. Sometimes knob-and-tube electrical. Heritage tile.
Pre-1940 houses
Specialist trade. Original-section timber, lath + plaster, historic plumbing. Standard renovation builder often not the right operator.
Heritage / Conservation
Council heritage consultant approval. Original-material match for some surfaces. Adds months.

Ask this, exactly

"What's your variation rule + $ ceiling if you find termite / asbestos / lead paint mid-demo?"

Edge cases — get a second opinion for…

Heritage Conservation Area
Heritage consultant approval. Original-material match. Adds 3–6 months.
Strata / townhouse
Owners corporation approval. Common-property impact. Many strata schemes restrict renovations entirely.
Structural changes (load-bearing)
Engineer's report + structural builder required. Renovation builder coordinates but engineer signs off.
Asbestos discovery mid-demo
Licensed removal + disposal. Halt work. Specialist trade. Variation rule applies.
Wet area renovation
Bathroom + ensuite + laundry — waterproofing membrane + AS 3740 compliance. Verify in inclusions list.
Living-while-renovating
Dust + noise + access management. Some builders prefer empty house — discuss in advance.
Stages over multiple years
Phased renovation with budget gaps. Each phase a separate contract — not "we'll get back to that bit".
Owner-supplied materials
You supply fixtures + finishes. Allocates risk + warranty differently. Get in writing.
Pre-purchase renovation
Don't exchange contracts on the house until renovation feasibility + cost is established. Many "this house has potential" disasters.

After they leave.

Same as a new build: 13-week defects period, 6-year structural clock, warranty pack at handover. Plus a small post-handover scope unique to renovations — settling cracks, paint touch-ups, drawer alignment as new joinery acclimates.

13-week defects period.

Walkthrough at handover. Defects list. Final 5% retention until closed out.

Settling-crack window.

Plaster cracks at junction lines in first 12 months. Working renovator returns for touch-up.

Warranty pack.

Folder of manufacturer warranties + sub-trade contact details + compliance certificates.

12-month walkthrough.

Optional. Mark of a real operator. Settling defects caught + closed.

Ask this, exactly

"What's your defects period + the 12-month walkthrough rule + the warranty pack contents?"

If you've read this far

A renovation builder who caps the variation rule in writing before deposit is not a unicorn. It's the bar.

We can introduce you to renovation builders in your area who already work this way. No paid placement.

✓ No referral fees✓ Verified means all 10✓ No spam

Find a vetted renovation builder Kitchen · bathroom · extension

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Trade 27 of 33.

Hiring a Renovation Builderis where the scope creeps you to NCAT.

A research dossier, not a referral page.

Renovations live or die on thevariation rule.

Design-build

Build-only

A renovation builder who caps the variation rule in writing before deposit is not a unicorn. It's the bar.

Hiring a Renovation Builder
is where the scope
creeps you to NCAT.

Renovations live or die on the
variation rule.