Yes—if the retaining wall is for the residential building structure, including a wall that supports the home, the NT Government says a fidelity fund certificate is needed. No—if the wall is separate from and does not support a residential building. Under the NT Government’s guidance, building work worth over $25,000 that increases a property’s residential floor area is prescribed residential building work; the same guidance says reforms commenced on 30 March 2026 (figures checked 1 October 2026).
What is the difference between the two retaining-wall situations?
The NT Government draws the distinction according to the wall’s relationship with the residential building:
| Description used by the NT Government | Fidelity fund certificate |
|---|---|
| A retaining wall separate from and not supporting a residential building | Not needed |
| A retaining wall for a residential building structure | Needed |
A wall being constructed on the same property does not, by itself, make it part of the residence. The relevant distinction is whether it is separate and non-supporting, or whether it is for the residential building structure.
If a proposed wall falls between those descriptions, the owner or builder should confirm the structural relationship rather than relying only on whether the work is described as landscaping. Fidelity Fund NT can also be contacted about the certificate requirement.
When does an extension bring the wall into the prescribed-work analysis?
The addition or extension rule looks at the work as a whole. The NT Government says a certificate is needed for additions and extensions to specified residential buildings when:
- the works are over $25,000; and
- the works increase the building’s floor area.
The listed buildings include a house, duplex or townhouse, and flats less than three storeys, excluding undercroft or underground parking levels.
If a retaining wall forms part of a qualifying addition or extension, that job contains prescribed residential building work. Builders must obtain a fidelity fund certificate for every job containing prescribed residential building work, so the wall should not be treated as an exempt landscape item merely because a separate wall would not need one.
The cited guidance does not state a separate dollar threshold for the retaining-wall component within that addition. The wall’s relationship to the residential structure must still be considered: if it is for that structure, the regulator’s retaining-wall category says a certificate is needed.
Has the threshold always been $25,000?
No. The NT Government gives the following position:
| Reform point | NT position |
|---|---|
| Commencement | The legislative reforms commenced on 30 March 2026. |
| General minimum prescribed value | The minimum prescribed value triggering a fidelity certificate increased from $12,000 to $25,000. |
| Certificates affected | The amendments apply only to certificates issued after 30 March 2026. |
The amendments were not applied retrospectively because changing the liability of already-issued certificates for future claims could affect the financial position of the Fidelity Fund NT.
For the specific addition or extension test, the regulator uses the wording “over $25,000” together with an increase in residential floor area.
What must the builder do?
A registered Northern Territory builder must:
- apply to Fidelity Fund NT for an annual level of cover;
- show financial capability and experience for the level of cover sought;
- obtain a fidelity fund certificate for every client job that includes prescribed residential building work;
- have the certificate before obtaining a building permit for prescribed work; and
- have it before demanding payment from the owner.
Owner-builders must also have a fidelity fund certificate to cover future owners for building defects. Owner-builder cover becomes available only after the property is sold or transferred, and only if the owner-builder becomes bankrupt, dies, disappears or has their registration cancelled by the Building Practitioners Board.
At the time checked, Fidelity Fund NT was the only provider in the Northern Territory. Contact details listed by the NT Government are:
- Phone: (08) 8922 9680
- Email: info@fidelityfundnt.com.au
- Website: www.fidelityfundnt.com.au
What does the certificate cover?
Residential building cover in the Northern Territory is issued in the form of a fidelity fund certificate and is similar to home warranty insurance cover in other states.
| Situation | Position under the NT guidance |
|---|---|
| Builder status | Cover responds if the builder becomes bankrupt, dies, disappears or has their registration cancelled by the Building Practitioners Board. |
| Completing the work | Covered costs include those associated with transitioning to a new builder to complete the work. |
| Non-structural defects | Covered costs include rectification during the first year after completion. |
| Structural defects | Covered costs include rectification for six years after completion. |
| Building permit extension | The non-completion cover timeframe recognises an approved extension to a building permit. |
| Making a claim | A claim may be made within 90 days of becoming aware of a defect or a trigger event occurring. |
A defect does not by itself make a claim available. The NT Government says a fidelity fund claim cannot be made if the builder has not died, disappeared, become insolvent or been deregistered.
How should an owner check the current position?
Check both parts of the project rather than relying on the label “retaining wall”:
- Does the wall support or form part of a residential building structure?
- Is it included in an addition or extension worth over $25,000 that increases residential floor area?
- Does the job include any other prescribed residential building work?
- Has the building permit been extended, and would that affect the non-completion cover timeframe?
This is general information, not financial or legal advice. Check the current NT Government regulator page and your policy’s Product Disclosure Statement before relying on a certificate requirement or making a claim decision.
Sources
FAQ
Does every retaining wall near a Northern Territory home need a fidelity certificate?
No. A wall that is separate from and does not support a residential building does not need one. A retaining wall for a residential building structure does.
Does a retaining wall included in a new floor area need a certificate?
The addition or extension makes the whole job prescribed residential building work when the works are over $25,000 and increase the residential floor area. The builder must then obtain a certificate for that job, including any retaining wall forming part of it.
Does the retaining-wall component need a separate $25,000 value?
The cited regulator guidance does not specify a separate dollar threshold for the wall component within a qualifying addition. The floor-area rule applies to the works forming the addition or extension.
When must the builder obtain the certificate?
For prescribed residential building work, the certificate must be in place before the building permit is obtained and before the builder demands payment from the owner.
When can an owner make a fidelity fund claim?
A claim may be made within 90 days after the owner becomes aware of a defect or a trigger event occurs. The builder must also have died, disappeared, become insolvent or been deregistered for a fidelity fund claim to be available.
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