The cheapest concreting quote in Dandenong is usually the most expensive long-term. The reason is the ground. Most of Greater Dandenong sits on reactive clay, the soil that swells in winter and shrinks in summer, and a driveway or slab poured without proper excavation, base and reinforcement will crack within a few years on this ground. The difference between a quote that's cheap and one that's honest is almost always in the things you can't see on pour day: the depth of the excavation, the base under the slab, the steel in the concrete, and the joints that control where it cracks. Ask the nine questions below before you pay a deposit. The answers tell you whether you're dealing with a concreter who builds for the ground or one who builds for the quote.
1. Will you give me a written, itemised quote?
A proper quote breaks the job down: excavation, base, reinforcement, concrete, finish, and any permits or pumping. Each line has a quantity and a spec, so you can see exactly what you're paying for and compare it line-for-line with another quote. A lump-sum quote with no breakdown is one you can't compare, and that's the point.
Red flag: A round-number verbal quote with nothing in writing. If the concreter won't put it on paper with a breakdown, they don't want you to compare it.
2. What excavation depth and base do you use?
On Dandenong clay, the answer should be 100 to 150mm of excavation down to a compacted crushed-rock base. The base is what stops the driveway from moving with the clay. Pour straight onto the existing ground and the slab goes wherever the clay takes it. The excavation and base are the difference between a twenty-year driveway and a five-year one.
Red flag: 'We pour straight on the existing ground.' No excavation, no base, the slab will move with the clay and crack within years.
3. What strength mix and reinforcement?
For a residential driveway, the answer should be N32 concrete (32 megapascals) with F62 mesh on bar chairs. The mesh has to sit in the middle of the slab to do its job. Mesh on the ground does nothing. Adding water on site to make the concrete easier to place weakens it permanently; the mix should arrive at the right slump.
Red flag: Adding water to the mix on site, or mesh sitting on the ground instead of on chairs. Both weaken the slab for the life of it.
4. Are you licensed and insured, and what's your public liability cover?
The answer should be yes, with a certificate of currency for public liability insurance. We carry $20 million public liability. If a concreter can't produce a certificate, you're carrying the risk yourself, and on a job that involves a concrete truck on your nature strip and a pour on your property, that's a risk you don't want.
Red flag: Can't produce a certificate of currency, or vague about the cover amount. No certificate, no job.
5. Who actually pours it, your crew or subs?
The person who quotes your job should be on site for the pour. If the quoter is a salesman who measures up and disappears, and the pour is done by a subcontractor you've never met, the standard is out of the quoter's hands. One crew, start to finish, means the person who looked you in the eye and gave you the price is the person who forms up, pours and finishes the concrete.
Red flag: You never meet the person who's actually pouring the concrete. If the quoter can't tell you who's on site, they don't know.
6. How do you handle council crossover permits?
Any work that touches the nature strip needs a vehicle crossing permit from the City of Greater Dandenong. The answer should be: we lodge the permit, we pour the crossover to spec, we reinstate the nature strip, and we handle the council inspection. You sign one form. If the concreter tells you the permit is your problem, they're either not experienced in the area or they're offloading work onto you.
Red flag: 'That's your problem.' A concreter who won't handle the crossover permit doesn't know the council process, or doesn't want to.
7. What's the cure time and when can I drive on it?
The answer should be: 24 to 48 hours for foot traffic, 7 days for vehicles, 28 days for full strength. Concrete gains about 70% of its strength in the first week and the rest over the following three weeks. Driving on it too early cracks it. A concreter who tells you it's fine to drive on tomorrow either doesn't know or is telling you what you want to hear.
Red flag: 'You can drive on it tomorrow.' You can't. It's at 20 to 30% strength and a car will crack it.
8. What happens if it cracks?
Concrete cracks. The question is where. Control joints tell the concrete where to crack: straight lines inside the joints, not random cracks across the slab. The spacing and depth of the joints matter. A concreter who says 'concrete never cracks' is either lying or hasn't been pouring long enough. The honest answer is: we place control joints to manage where it cracks, and we stand behind our work with a written guarantee.
Red flag: 'Concrete never cracks.' It does. The question is whether it cracks where you put the joints or across the slab.
9. Can I see local jobs you've done near me?
A concreter who's been working in the area should be able to point to jobs on streets near you. Photos are good; addresses are better. If the only photos are from another part of Melbourne, or there are no photos at all, the concreter may not have the local experience that matters on Dandenong clay. Local references mean the concreter knows your streets, your soil, and the council process.
Red flag: No local references, no photos, or photos from outside the area. No local jobs means no local knowledge.
Ask us these nine questions. We answer every one in writing. We give you an itemised quote with every line spelled out, we excavate to a compacted base on Dandenong clay, we pour N32 with F62 mesh on chairs, we carry $20 million public liability, our crew quotes and pours, we handle the City of Greater Dandenong crossover permits, we give you the cure windows in writing, we place control joints to manage cracking, and we can show you jobs on streets near you. Call 0407 977 529 or send your details and we'll come out and answer all nine.