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A retaining wall is a structure built to retain a difference in ground level. While a retaining wall can serve as the footing for a fence, the wall itself is not considered to be a fence and is covered by different laws. For information about fences, see our Fences and the Law booklet. Any excavation or filling of land associated with constructing a building or other significant structure needs development approval.

In these cases, details of the retaining wall for the excavation or fill must be included in the development application for the building or other structure. When a retaining wall is being built for other purposes, for example, landscaping, or when it is proposed to demolish, remove, repair or alter an existing retaining wall, then development approval from the relevant planning authority will generally be required. Whether or not approval is required can also depend on where the property is located.

Approval is not usually needed if the wall retains a difference in ground level of one metre or less. However, a retaining wall of one metre or less may still need approval if it is in certain zones or council areas. You should check with your local council whether approval is required.

Note that it is the overall difference in ground level that is measured - if two or more retaining walls each less than one metre high are used together in a tiered fashion, the overall difference in ground level must be less than one metre, otherwise approval will be needed. This is the case even if development approval is not required.

Work that is treated as affecting the stability of neighbouring land includes:. Figure 1. Notice of the intention to perform the work and the nature of that work must be given to the owner of the adjoining land at least 20 business days before commencement of the work [s Planning Development and Infrastructure Act SA ]; reg 64 2a b Planning, Development and Infrastructure General Regulations SA ]. It must have sufficient detail about the proposed work to be undertaken, as well as details of how long the work is estimated to take.

If development approval was also required, you should provide the neighbour with information from the development application and approval. If development approval was not needed, it may be worth considering obtaining professional engineering advice, which can then be included in the notice.

If the neighbour has concerns, they may engage a professional engineer to provide a report, along with plans and specifications, on the need to shore up any excavation or to underpin, stabilize or otherwise strengthen the foundations of any building. They are Pinterest Landscaping Retaining Walls 2021 also required to pay the reasonable costs of obtaining the report, plans and specifications. Payment can be enforced, if necessary, by application to the Environment, Resources and Development Court.

If the Best Landscape Fabric For Retaining Walls neighbour has requested that work be carried out, as specified by a professional engineer, the person building the wall may be able to obtain some payment from the neighbour towards the work, either by negotiation or by application to the Environment Resources and Development Court.

This may occur, for example, when the neighbour will obtain some additional benefit from the performance of the work specified by the engineer. A land owner who has been served a Schedule 10A Form 1 Intention Notice and believes they need more time to obtain engineering advice should, in the first instance and if possible, discuss the matter with the person proposing to do the building work. If more time is not agreed, the land owner may make an application to the Environment, Resources and Development Court to stop commencement of work until necessary engineering advice has been obtained.

If required notice was not given before work was done, a neighbouring owner may, if necessary, apply to the Environment, Resources and Development Court to have further work done to ensure the stability of their land is not affected. It is not the role of local councils to check or enforce the service of notice in relation to work that may affect the stability of neighbouring land. However, if a local council has received a development application, which includes a retaining wall that does not itself need approval, the council may attach an advisory notice to its approval, reminding the owner that they may still need provide notice under s of the Act by the prescribed form, a Schedule 10A Form 1 Intention Notice.

If so, and if you need development approval, your application to the relevant authority must indicate that you have approval to build from the relevant person or authority who benefits from the easement or encumbrance. If you do not need development approval, you must still obtain the approval of the authority controlling the easement or the person holding the encumbrance before starting work.

The most important factor in answering this question is determining the natural state of the land, as land in its natural state needs no support.

It is only when the natural land is altered that support is required. Any party can alter the natural state of their land subject to development controls , but with this ability comes the obligation to support the adjoining natural land.

As a general rule, each owner is responsible for retaining the portion of earth that they or the previous land owner have altered from the natural ground level. This could be fill placed on top of the natural ground level or excavation below the natural ground level. In Pantalone v Alaouie 18 NSWLR , Giles J considered the law of nuisance and found "withdrawal of support from land is an actionable nuisance for which strict liability attaches without proof of negligence.

If a land owner is experiencing loss or damage because their neighbour has altered the natural state of the land, even though their neighbour has a responsibility to support the land, the land owner has an obligation to mitigate minimise their damage. If action is not taken to mitigate damage, any claim they may have may be affected. Rather than each owner building a separate wall to retain what they have filled or excavated, it is usually more practical and economical to build one retaining wall.

It is therefore advisable to discuss your plans with your neighbours. Where one party fills and the adjoining owner excavates, each party is liable according to the proportion that the retaining wall supports the fill or excavation.

What happens when there is an existing retaining wall? Owner A also has an obligation to ensure the existing retaining wall is not overloaded. This may require piers to be sunk below the level of the existing retaining wall to maintain its integrity. The owner B seeking to excavate will be responsible for the cost of the retaining wall to support the excavation they caused and also any costs to ensure that the previous retaining wall erected by the adjoining owner A is adequately supported.

However, under the Planning, Development and Infrastructure General Regulations SA , the existing fill retaining wall should have been built to allow for some excavation on the adjoining property. If this did not happen and stabilizing work is needed, B may be able to argue that A should contribute to the cost of this work.

Where both parties benefit from the existence of the retaining wall, as in example 1 above, then it is reasonable that both parties will contribute to the maintenance of the retaining wall according to the proportion of the benefit they receive.

However, over time and as properties change hands, it can be difficult to know what the gradient of the natural ground level was, who actually altered it, and to what extent.

While a relevant planning authority may need to give approval for repairs, it is not the role of councils to determine the proportion of benefit and consequent apportionment of costs.

If the erection of the retaining wall is due to solely to one neighbour affecting the natural state of the land, as in examples 2 and 3 above, then the party affecting the natural state of the land is responsible for repairs and maintenance. That is, each owner and subsequent owner of that property is responsible to maintain the wall that benefits them. Even if it is the responsibility of one owner to repair a retaining wall, if a neighbour is experiencing loss or damage due to a faulty, deteriorating or damaged retaining wall, that neighbour has an obligation to mitigate their damage, or else any claim may fail.

As repairing or altering a retaining wall is classified as development, consideration must be given to whether development approval is needed prior to any work being Retaining Wall Metal 90 commenced. Check with your local council. Generally, the principles outlined above under Development approval apply. However, if the repairs are minor, using similar materials and not relating to the stability of the wall, formal approval may not be required. Where it is proposed to build a single retaining wall between properties for the benefit of both land owners, then, if the neighbours agree, the wall can straddle the boundary.

Costs are apportioned according to the benefit received. If there is no agreement between neighbours, or if there is an existing retaining wall, as in examples 2 and 3 above, then a retaining wall must be built solely on the property of the person required to build the wall. If a retaining wall has been built on the wrong side of the boundary this sometimes occurs, for example, when a developer has built adjoining properties , two issues arise: who is responsible to maintain the wall, and encroachment.

Regardless of which side of the boundary the wall is, the owner receiving the benefit of the wall is responsible for maintaining it. Retaining walls Retaining Wall Vinyl Quiz come under the Encroachments Act SA , and a retaining wall on the wrong side of the boundary is an encroachment. The Act provides for the adjustment of boundaries or compensation where walls encroach on adjoining land. Neighbours may negotiate to resolve the issue. If necessary, an application may be made to the General Division of the Supreme Court.

If the proposed retaining wall is on the boundary of council land, for example, the footpath reserve, then the whole wall, including the footings, must be on your land and not on council property. The Planning, Development and Infrastructure Act SA allows for emergency orders to be made if an authorized officer of the local council determines there is a threat to safety arising out of the condition of a retaining wall or an excavation.

A local council will usually only consider making an emergency order in extreme cases. Further, if there is any uncertainty about whose responsibility the work is, a council would normally serve notice on both land owners, as it is not the role of councils to decide whose responsibility it is to perform the work.

An owner can appeal the order within 14 days after the order is received by them or longer if granted an extension by the court [s 11 Planning, Development and Infrastructure Act SA ]. The following disputes are dealt with in the Magistrates Court Minor Civil Action jurisdiction , because they are neighbourhood disputes arising under the common law of nuisance:. Community Mediation is also available in such matters.

Disputes about development applications and prescribed notices issued under s of the Act dealt with in the Environment, Resources and Development Court. While initial advice may be obtained from the Legal Services Commission or Community Legal Services, you may need to see a private lawyer about such matters.

Toggle navigation. Legal Help for all South Australians. Refine results. Search by. Retaining Walls. Is development approval required? Must notice be given to the neighbouring land owner? The retaining wall between B and C: The cost is shared equally between them as they benefit equally from the retaining wall. Retaining Walls : Last Revised: Tue Mar 23rd The content of the Law Handbook is made available as a public service for information purposes only and should not be relied upon as a substitute for legal advice.

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