Agreements and contracts

A contract arises when one party makes an offer and the other party accepts it, even if they haven't signed anything or the agreement was made verbally. If possible, you should still get the details of the agreement in writing.

For work worth $10,000 or more, you must have a written contract with a registered builder. This is known as a major domestic building contract. For work that is under $10,000, it is still recommended that you use a written contract.

You can engage a professional to manage a building contract or building works on your behalf, such as an architect, building consultant or project manager. They can ensure the building work meets the standards and quality stated in the contract. See Roles and responsibilities to understand the types of professionals that may be involved in your project.

Certain information must be included in major domestic building contracts. This is to protect you and the builder if things go wrong. To find out what you should include, read CAV’s Building contracts checklist.

Some examples of information that should be in a contract include:

• The specifications or scope of works with details of exactly what’s included and specifically excluded
• Timeframes for the work, including start dates
• How to address delays and extra costs
• How to address variations to the contract and the costs incurred if you change your mind.
• Who will supply the materials, whether it’s you, the builder or a separate company
• Who will do the work (and be listed on the building permit as the builder) and what work will be done by someone else under a separate contract
• Details of the work to be completed at each stage
• Progress payments required at each stage
• Dates progress payments are due and methods of payment

Knowing exactly what you want and making it clear can prevent misunderstandings down the line. Decide on:

• The plans, specifications and scope of works with details of exactly what’s included and specifically excluded. Always specify the features, brands, models, materials, colours, finishes, layouts and quantities that are important to you
• Sustainability and energy efficiency in designs, such as double glazing, insulation, water saving taps and appliances
• Standards and quality of work and materials, whether high-end, generic, or mid-range

Always read contracts thoroughly before signing and look out for unfair contract terms. For large building projects, have the contract reviewed by a lawyer, but remember that doing this means you are no longer entitled to a cooling off period after signing.

Deposits must never exceed 10% if the total contract price is under $20,000 and 5% if the contract price is $20,000 or more. It is illegal under the Domestic Building Contracts Act 1995 for a practitioner to request a higher deposit.

Prime cost items are items that have not been specified or whose price is not known at the time you enter into a building contract. Examples include taps, door handles, tiles and cooktops. It’s best to avoid prime cost items by specifying makes, models and prices so you can avoid unexpected costs later.

Provisional sums are estimated costs of carrying out particular work (and supplying required materials) when the cost of the work cannot be determined by the builder at the time you enter into a contract. Examples include excavations when soil conditions are uncertain. Provisional sums should be avoided where possible as they can lead to unexpected costs.

Always keep a copy of the signed contract.

For work worth $16,000 or more, do not proceed with a major domestic building contract until the builder has provided a current certificate of domestic building insurance (DBI) covering your address. DBI will cover you if your builder dies, disappears or becomes insolvent. If a valid DBI policy is not in place, any payments made may be at risk and unrecoverable.

You can ask your builder for a copy of the DBI Certificate of Insurance relating to your individual property if it has not already been provided to you prior to work commencing or you making any deposit payments under the building contract. You can also contact the builder/building surveyor or local council to find out the name of the insurer and the policy number. This information is usually listed on the building permit.

Make sure the name of the builder in your contract and building permit matches exactly with the builder in the DBI policy documents. Otherwise, the DBI policy may be invalid.

It is an offence for builders to demand or receive money under a major domestic building contract with a value above $16,000 without ensuring the domestic building work is covered by a DBI policy. Individual builders can be fined up to $96,000, and a body corporate up to $480,000, if they are found to have breached this offence. The VBA can also take disciplinary action against a non-compliant practitioner, including by immediately suspending their registration.

More information about DBI is available at the VBA : Understanding domestic building insurance and why it is important

Implied warranties and consumer guarantees are automatically applied when you have an agreement with a builder or tradesperson, even if you don’t have a signed contract. They state that work should be performed:

• in a workman-like manner
• with reasonable care and skill
• using materials that are fit for purpose
• within the date specified in the contract or, if not specified, within reasonable time.

Builders and tradespersons may offer warranties over and above what is required under the building laws and Australian Consumer Law (ACL). Such promises (e.g., that a shelf can hold 100kg or a solar panel is guaranteed to last 25 years), whether they are verbal or in writing are subject to the ACL. You may have claim to a repair, replacement or compensation from the supplier when a good or service doesn’t meet the stated or agreed quality, standard or performance. You may also be provided with manufacturer warranties for parts of your building.

Always keep a record of any additional warranties offered by a builder, tradesperson or supplier.

Your contract should state who is responsible for obtaining a building or planning permit if they are required, whether it’s you, your architect, builder or another professional.

Building permits are issued by your building surveyor. All building and demolition work requires a building permit unless an exemption exists. For example, garages, sheds and fences do not require a building permit if they meet certain conditions, and renovations may not require a building permit if the structural soundness and safety of the home are not affected. Find out whether your project requires a building permit by reading the VBA’s Practice note: When is a building permit required?

Planning permits are issued by your local council. You may need a planning permit if you are building, extending or renovating your home. To find out whether your project requires a planning permit, contact your local council and talk to a council planner about your project. Read about planning permits and the application process through Planning Victoria.

Building work can’t begin until the building permit is issued, and a building permit can’t be issued until the planning permit has been obtained.

Read more:

• VBA | Planning and building permits
• CAV | Plans and permits
• CAV | Plans and permits - checklist

If your project requires a building permit, you (or someone authorised to act on your behalf) must engage a building surveyor to obtain one. You can engage either a municipal building surveyor or a private building surveyor.

Once a building surveyor takes on the project, they become your relevant building surveyor (RBS). The RBS is there to ensure building works comply with the building laws.

Your builder may suggest a private building surveyor, but they cannot appoint them on your behalf. You are free to engage a building surveyor of your choice.

Read more: VBA | Appointing a building surveyor