A 'quote' is when the seller of goods or services tells you exactly what something will cost you. They do this based on their skill and experience with similar goods or services. The seller can't charge you more than a quote you have accepted. Quotes can be in writing or told to you and should include GST. It is good to ask for a quote in writing as proof.
A written quote should show:
What work is to be done.
Start and finish dates.
The cost for time.
The cost for materials.
How long the quote is good for.
An 'estimate' is where the seller of goods or services guesses at what something will cost you. It can be written or just told to you and should include GST.GST (or say if they don't include GST). What you end up paying can be more or less than the estimate but should not be any more than 10% above the estimate. It is a good idea when you get an estimate to ask the seller to write down the most it could cost.