Underpinning Contractors Adelaide: How to Compare Licences, Contracts and Quotes

• Who you are hiring: a building contractor. In South Australia a business doing building work needs a contractor's licence, and the person supervising it must be a registered building work supervisor.
• First check: the licence number on the written quote, looked up on the public register before you sign anything.
• The engineer: a structural engineer's report usually names the cause and the method before anyone prices the job.
• The contract: larger domestic jobs need a written, signed contract that shows the builder's licence number.
• Insurance: building indemnity insurance applies above a value threshold when approval is needed, and the certificate goes to the owner.
• The quote: compare scope, method, engineering, approvals and make-good, because the total alone hides the differences.
• Where to begin: a handful of photos and a few lines about the building give a contractor enough to say if the footings are probably involved and whether an inspection is needed.

The three words describe the same trade from different angles, and the label on the website matters less than what the business is authorised and equipped to do, and what experience it brings to projects like yours.

An underpinning contractor is a building contractor who takes the job on contract, whether it is a sole trader or a larger firm. An underpinning company is the same thing with a registered business behind it, and underpinning companies Adelaide homeowners find online range from sole traders to firms with several crews. Underpinning specialists are firms whose daily work is footings, piles and ground improvement, as opposed to builders who do underpinning now and then beside extensions and renovations. Underpinning specialists Adelaide wide should be able to show finished projects on reactive clay, and that experience is what you are paying for.

Two other kinds of business turn up in the same search results, and they do different jobs:

• Engineering practices write the report and design. They do not usually dig, pour or inject, and some will not carry out the work they specify.
• Ground engineering firms concentrate on injection and soil improvement, often for larger commercial and infrastructure work.

Searches for underpinning contractors near me, underpinning specialists near me and underpinning companies near me mostly return a mix of all four, plus directories that list businesses without checking them. A search for foundation underpinning contractors near me is no better: the results rarely separate a specialist from a general builder. Distance is the weaker filter. Licence, engineering and a written scope tell you more about a contractor than a pin on a map, and how the repair itself works is explained under underpinning Adelaide before you choose anyone to compare.

A builder in South Australia needs the right licence before taking on most kinds of domestic building work, and a builder who works without one risks significant penalties. The rule is in Part 2 of the Building Work Contractors Act 1995 (SA), according to the Legal Services Commission's Law Handbook. Domestic building work is defined broadly and includes construction, renovation and repairs to a house.

State Government guidance adds two details. Building work contractors are the people who carry out construction, trade, demolition, site preparation, and restoration and repairs. A business needs a contractor's licence, and the person supervising the work must be registered as a building work supervisor. For sole traders, the guidance says both are normally applied for together because both are required to contract work.

Checking takes a few minutes:

1. Get the licence number. It should appear on the written quote, the website or a business card, and on the contract.
2. Search the public register run by Consumer and Business Services. You can search by licence number, or by the surname or trading name.
3. Match the details. The name on the quote, the name on the register and the name on the contract should agree.
4. Ask which licence covers underpinning. The sources above do not name underpinning, so ask the contractor to say in writing what the licence authorises.

A company that will not give a licence number, or whose number does not match the register, has answered the first question for you. Check the company name on the quote against the company name on the register, because a trading name and a registered company are not always the same.

For domestic building work above a value threshold, the Act requires a contract that is in writing, legible, sets out all of its terms, shows the builder's business name and licence number, and is signed by both the owner and the builder. The threshold was raised on 10 November 2025, so confirm the current figure with Consumer and Business Services and do not trust an older web page. Smaller jobs count as minor domestic building work with lighter requirements, but the builder still needs the right licence and the statutory warranties still apply.

Points worth reading in any underpinning contract:

• Notice and copy. A signed copy and a prescribed notice, Form 1, Your Building Contract: Your Rights and Obligations, must reach you as soon as possible after signing.
• How the price is built. The contract states whether it is a fixed price lump sum, a rise and fall arrangement or cost-plus. Fixed price is the most common, and variations should be agreed in writing.
• Cooling off. The Law Handbook describes five clear business days after signing in which an owner can end the contract by written notice. Get advice before relying on it, because the details matter.
• Progress payments. A builder must not demand money unless it is a genuine progress payment for work already done. Regulations also limit what can be asked for before work starts, with allowances for preliminary items such as an insurance premium and engineering fees.
• Start and finish. Look for a start date, a finish date or an estimate of working days.

If an offer arrives unsolicited, at the door or after a storm, the Australian Consumer Law rules for door-to-door sales add a ten business day cooling-off period, and that is a reason to slow down and compare underpinning contractors instead of signing on the spot.

Building indemnity insurance. Where domestic building work is above a value threshold and development approval is required, the builder must hold an indemnity policy. A certificate must go to you and to the relevant authority when approval is sought, and work cannot begin without it. The Law Handbook says it covers an owner for defective work when the builder dies, disappears, cannot finish or becomes insolvent. It protects you if the contractor fails, and it does not protect you if the ground moves again.

Other cover. Ask each contractor to show current public liability insurance, because underpinning means excavation next to a building and an occupied home. This is general advice from contractor guides, not a rule quoted from the Act.

Your own policy. Whether your home insurer pays for movement damage depends on the policy and the cause. Ask your insurer first, and hold on to the engineer's report as evidence of the cause.

Statutory warranties. The Act builds warranties into every domestic building work contract: work to accepted trade standards and the agreed plans, materials that are good and proper, compliance with statutory requirements, reasonable diligence, and a building fit for its purpose. Proceedings for a breach must start within five years of completion, the limit cannot be extended, and the warranties pass to later owners. A separate long-stop period of ten years applies to actions for defective building work. A contractor cannot contract out of the Act, and any term trying to do so is void.

Talk to the contractor as soon as you notice a problem, because most issues are easier to fix early. Legal advice or Consumer and Business Services can help if talking does not settle it.

Underpinning contractors should not be left to guess at a cause. A structural engineer's report normally records the cracks and levels, names the likely cause, sets out which footings need support and specifies the method, the depth and how many support points are needed. Contractors then quote against the same document, which is what makes their prices comparable.

Ask what experience the engineer has with reactive clay in this part of South Australia. Independent advice matters. An engineer who writes the report and does not benefit from the work has no reason to recommend more of it than the building needs. At least one directory guide treats a contractor who dismisses an engineer's involvement as a warning sign. That is common advice and not a legal requirement.

Four questions settle the practical side:

1. Who commissions the report, you or the contractor, and who pays for it?
2. Does the quote include the engineer's report, or does it assume you will supply one?
3. Will the engineer inspect the work and sign it off, or only draw the design?
4. Does the council or a private certifier want the report? Underpinning may need building consent, so ask your council in writing before work is booked, and ask the contractor to confirm who deals with the council.

If two contractors propose different methods for the same engineer's report, ask each to explain why theirs suits your soil and footings. The answer shows whether they are following the design or selling a system.

A general builder can be the right choice when foundation underpinning is a small part of a larger job, such as an extension on an old footing, and the builder holds the licence and has finished similar projects. A specialist underpinning company suits a job where the footings are the whole problem. Underpinning specialists near me may be a short drive away and still lack experience with your type of building, so ask before you choose. An underpinning specialist with relevant experience will usually ask for the engineer's report before quoting.

The differences to weigh are practical: how many comparable projects the crew completes in a year, whether the plant and piling equipment is its own or hired, whether the firm subcontracts the support work, and who is on site when concrete is poured. Ask for addresses or photos of finished projects similar to yours, and ask whether the person who inspected your building will supervise the work. Underpinning specialists Adelaide homeowners trust will usually welcome those questions, and a company that resists them is telling you something.

Underpinning specialists and general builders both appear on the licence register, so the register alone cannot rank them. Neither type is automatically better. The engineer's report, the licence check and the written scope decide that. The underpinning companies Adelaide residential owners shortlist should each show foundation underpinning projects of the same kind, and for a heritage building, a commercial slab or a resin job you should choose from contractors who can show that kind of work, with references you can call.

Put these in writing, and keep the replies with the quote.

• What is your licence number, which company holds it, and what does it authorise?
• What experience does the crew have with buildings like mine?
• Who is the building work supervisor on this job?
• Which engineer designed the work, and will that engineer inspect it?
• Why does this method suit my soil, footings and loads, and how many projects like mine has your company finished?
• What is in the price, what is provisional, and what happens if the ground is different from the report?
• Do you check with the council whether building consent is needed, and who lodges the application?
• Can you show a current insurance certificate, and the indemnity certificate if one is required?
• What is the payment schedule, and what is due before work starts?
• Who repairs the finishes and the cracks, and when?
• What do you monitor afterwards, and what should I look for?
• Can you show finished projects like mine, with references I can call, and reviews I can check independently?

One flag is a reason to ask a question. Two or three together are a reason to get a second opinion from an independent engineer in Adelaide.

• A quote without a site visit, or a verbal quote only.
• A licence number that is missing, will not be given or does not match the register.
• Pressure to sign today, or a discount that disappears if you wait.
• An unsolicited approach at the door or after a storm.
• A request for large payments before work starts, or payments not tied to work completed.
• A contractor who dismisses the need for an engineer.
• Underpinning specialists who refuse to name the engineer behind the design.
• A scope too vague to compare, or a written quote with no exclusions listed.
• Reviews or references you cannot verify, projects you cannot see, or no fixed business address for the company.

• If you have not had an engineer's report, book one before you collect quotes, so every contractor prices the same design.
• If you want to understand the totals first, read about underpinning cost before you compare anyone.
• If you hold one quote already, check its licence number, then ask for two more written on the same scope. Choose the companies to ask by their finished projects, not by a search for underpinning companies near me alone.
• If a contractor wants money before the contract is signed, stop and read the contract rules above. The Form 1 notice explains what you can be asked for.
• If the work needs approval, ask your council or a private certifier, then ask the contractor to confirm who lodges what. The council can also tell you whether a heritage listing adds steps.
• If you are not sure underpinning is needed, start with foundation repair, because a leak or drain may be the cause.
• If the building is commercial or heritage, read commercial underpinning before you shortlist anyone, and choose underpinning contractors near me only after you have seen their commercial projects.

To request an underpinning quote Adelaide contractors can price on the same scope, send photos of each crack with a coin or ruler beside it, plus doors, floors and any gap that has opened. Add a few lines on when you noticed the movement and whether it has grown. Say whether the building is a house or commercial, and mention any engineer's report, plumbing repair or tree removal nearby. Include your suburb and contact details. Our reply will be one of three things: an on-site inspection, a call for extra photos, or advice that another repair suits the building better than underpinning. Use the form on this page or contact us, or read about us first.