Operator on a ride-on power trowel finishing a large burnished concrete warehouse floor

Concrete & civil contractors · Cavan, SA

Excavation and concrete in Adelaide, one crew from dig to finish.

Slabs, warehouse floors, site cuts and tank removals for homes, businesses and mine sites across SA. Free quotes and site visits.

Jobs completed since 2020
400+
Jobs completed since 2020
Roger's time in concrete
35+ yrs
Roger's time in concrete
Mine sites in SA, WA & NT
3 states
Mine sites in SA, WA & NT

What we do

Concrete and civil services in Adelaide

Our most requested concrete and civil jobs. All 18 services, from core drilling to tank removal, are on the services page.

View all 18 services

Get a free concrete or excavation quote

Tell us what the job is, where it is and when you need it, and we'll come back with a price. For urgent work, call Roger direct on 0419 313 985.

Prefer to call?

0419 313 985

Email

roger.s@ajcontractors.com.au

Based in

Cavan SA 5094

Hours

Mon–Sat 6:30am–5pm · Sundays & emergencies on request

Service area

Concrete and civil work across Adelaide, regional SA and mine sites

Based in Cavan. Jobs within about 20km of the yard carry no travel charge. Further out, the fee is on your quote before you commit.

  • Cavan
  • Wingfield
  • Gepps Cross
  • Regency Park
  • Edinburgh Parks
  • Dry Creek

See all service areas

Concrete slabs built to spec, from the base up

  • Base prepped to spec
  • Mesh on chairs, not on dirt
  • Joints cut same day
  • Mine-site compliant: SA, WA, NT
  1. The ground decides the crack

    Most failed concrete is a base problem, not a concrete problem. We excavate to depth, bring the base up in compacted layers and check moisture before anything is ordered. On Adelaide's reactive clay that step is the difference between a slab that moves evenly and one that splits in its second summer.

  2. Reinforcement sits where the drawing says

    Mesh goes on bar chairs at the specified cover, not dragged up through wet concrete and hoped for. On engineered work we pour to the drawing and leave it exposed for inspection before the truck arrives, so anyone who needs to sign it off can actually see it.

  3. Joints cut on the day, not the week after

    Concrete cracks as it shrinks; control joints decide where. We saw-cut to depth as soon as the slab will take a blade, spaced to the panel size rather than to whatever looks even. Cut late and the slab has already chosen its own line.

  4. The finish is matched to the traffic

    A burnished warehouse floor, a broomed footpath and an exposed aggregate driveway are three different jobs from the same truck. We agree the finish and the seal before the pour, because the window to change your mind closes about an hour after the concrete lands.

About A&J

Family-run concrete and civil contractors from Cavan

Roger, owner of A&J Contractors

Roger has been in concrete since the eighties. In 2020 he and his son Anthony took over A&J, and they run it as a family business with the owners on the tools, rather than a name on a truck and whoever is available that week.

It means Roger answers his own phone, quotes the job himself, and is usually on site while it is being poured. If something needs deciding halfway through, you are talking to the person who will be standing in it, not to an office.

  • Who you'll deal with

    Roger takes the call and prices the work. Anthony runs the crew. Between them they are on nearly every job.

  • Sized to the job

    Big pours and civil jobs get the extra hands they need, with Roger and Anthony running the site from start to finish.

  • What we take on

    Driveways and slabs through to warehouse floors, and civil work on mine sites in SA, WA and the NT. If it is not our kind of job we will say so.