We build in Sydney, South Coast (Wollongong) & Central Coast NSW
We build in Sydney, South Coast (Wollongong) & Central Coast NSW
We build in Sydney, South Coast (Wollongong) & Central Coast NSW
We build in Sydney, South Coast (Wollongong) & Central Coast NSW
We build in Sydney, South Coast (Wollongong) & Central Coast NSW

Red flags to look for in a granny flat quote

Last reviewed: August 2026
By BlueGum Granny Flats
Builder Licence 247388C
HIA member
HIA GreenSmart
In-house approvals, not outsourced
NSW Fair Trading

Most granny flat builders are legitimate businesses doing competent work. The warning signs below are worth knowing anyway, because the cost of missing one is measured in tens of thousands of dollars and the cost of checking is an afternoon.

The 3 that matter most are an unverifiable licence, a large deposit requested before insurance is in place, and a refusal to put exclusions in writing.

Red flags about the builder

The licence cannot be verified

A NSW builder’s licence can be checked publicly through NSW Fair Trading. Check that:

  • The licence exists and is current
  • It is held by the exact entity that will sign your contract, not a related company with a similar name
  • It covers the class of work

A mismatch between the licensed entity and the contracting entity is a serious problem, and it is not always obvious.

No HBCF cover, or cover promised later

Home Building Compensation cover is required for most residential building work in NSW over $20,000 including GST. The builder must have it in place before starting work or taking any payment, including a deposit.

If you are asked for a deposit and told the insurance will follow, that is the wrong order. You can check whether a policy has been issued for your property through the HBCF Certificates Register at Verify NSW.

A large deposit requested up front

Deposits on residential building work in NSW are regulated. If you are asked for a deposit that feels large relative to the contract, check the current limit with NSW Fair Trading before paying it.

Pressure to sign today

Discounts that expire at the end of the meeting, or a price that is only available if you commit now, are sales pressure rather than commercial reality. A genuine price for a 6 figure build will still be there in a week.

Red flags in the quote

Red flag
Why it matters
No site inspection before pricing
Site costs cannot be real
No soil test
Rock and soil classification are unknown
No itemised inclusions
You cannot compare it to anything
Refusal to put exclusions in writing
The exclusions are the problem
Several large provisional sums
It is not a fixed price
“Subject to site conditions” with no detail
Open-ended cost exposure
A price well below every other quote
Usually scope, not efficiency
Approval status vague or unaddressed
You may be paying for a build you cannot legally do
No mention of who arranges survey, soil test, engineering
Those costs land somewhere
Why it matters
Site costs cannot be real
Why it matters
Rock and soil classification are unknown
Why it matters
You cannot compare it to anything
Why it matters
The exclusions are the problem
Why it matters
It is not a fixed price
Why it matters
Open-ended cost exposure
Why it matters
Usually scope, not efficiency
Why it matters
You may be paying for a build you cannot legally do
Why it matters
Those costs land somewhere

The suspiciously low quote

A quote significantly below every other one is worth understanding rather than celebrating.

Usually the explanation is scope: floor coverings, driveway, fencing, connections and site works are excluded, and they will all be needed. Occasionally it is specification, with lower grade fittings than you are picturing. Sometimes it is a business pricing work below cost to win it, which creates its own risks partway through a build.

Ask what makes it lower. A good builder can explain their price.

Red flags in the contract

  • Payment stages tied to dates instead of completed work. You should pay for work that is finished, not for a calendar reaching a certain day.
  • A broad clause allowing price adjustment for “site conditions” with no definition of what counts.
  • No defects liability period, or no process for reporting and rectifying defects.
  • Variations not required to be in writing before work proceeds. This is how disputes start.
  • No stated timeframe, or no consequence attached to it.
  • The contracting entity differing from the licensed entity.

Have any building contract reviewed before you sign. It is a small cost against a 6-figure commitment.

What good looks like

To be fair about the other side of this, here is what a straightforward builder does.

  • Gives you the licence number without being asked twice
  • Inspects the block before producing a price
  • Arranges a soil test and prices site works from it
  • Provides an itemised inclusion list and a written exclusion list
  • Has HBCF cover in place before taking a deposit
  • Ties payments to completed stages
  • Puts variations in writing with a price before the work happens
  • Answers the awkward questions directly

Before you pay any deposit

A short checklist.

Check
Done
Licence verified on NSW Fair Trading, matching the contracting entity
HBCF certificate sighted for this job
Site inspection completed
Soil test completed and site costs priced from it
Written inclusion list received
Written exclusion list received
Provisional sums identified and understood
Contract reviewed
Deposit amount checked against the regulated limit
Done
Done
Done
Done
Done
Done
Done
Done
Done
Share with

Frequently asked
questions

NSW Fair Trading provides a public licence check. Search the licence number or business name and confirm it is current and held by the entity signing your contract.

The HBCF Certificates Register at Verify NSW shows whether a policy was issued, who the insured builder is, the property address, and whether claims have been paid.

Deposits on residential building work in NSW are regulated and capped. Check the current limit with NSW Fair Trading before paying, and be cautious about anything above it.

Not always, but it always deserves a question. Most of the time the difference is scope rather than efficiency, and the gap closes once the excluded items go back in.

For a 6-figure build, it is a sensible cost. A building contract is where the price, the timeline and your remedies actually live.

Ask us the hard questions

We would rather you checked. Licence 247388C, verifiable through NSW Fair Trading, and we provide inclusions and exclusions in writing.

Call BlueGum on 1300 060 651, or book a site assessment.

Building granny flats since

Since 2012

Builder licence

247388C, verifiable through NSW Fair Trading

Industry body

Housing Industry Association member

MBA NSW Excellence in Housing Awards

Winner 2021, Winner 2023, Finalist 2020

Completed granny flats documented on this site

70+

Approvals

CDC and DA, both managed in-house

Pricing

Fixed price after a site assessment, 2-bedroom from $134,990

Building granny flats since

Since 2012

Builder licence

247388C, verifiable through NSW Fair Trading

Industry body

Housing Industry Association member

MBA NSW Excellence in Housing Awards

Winner 2021, Winner 2023, Finalist 2020

Completed granny flats documented on this site

70+

Approvals

CDC and DA, both managed in-house

Pricing

Fixed price after a site assessment, 2-bedroom from $134,990

BlueGum Granny Flats is a licensed NSW builder, licence number 247388C, and a member of the Housing Industry Association. Setback, frontage and landscaping figures are drawn from the State Environmental Planning Policy (Housing) 2021 as in force in August 2026 and are general information, not planning advice. Other planning instruments applying to your land can vary them. Confirm the requirements for your block with a certifier or your council. Cost ranges are drawn from published 2026 Sydney market guides and are not a quote.
Check my block Call 1300 060 651