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.

Site cuts, base prep, slabs, warehouse floors, underground storage tank removal, cutting, core drilling and repairs for commercial sites, industrial properties, homes and mine sites across SA.

Free quotes and free site visits. Monday to Saturday, with emergency call-outs on request. Call Roger on 0419 313 985.

Based in Cavan, covering Adelaide metro, regional SA, and mine sites in SA, WA and the NT.

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.

General Concreting

Concreting in Adelaide for homes and businesses, formed, poured and finished properly.

Concreting across Adelaide for residential and commercial jobs, from shed slabs and pads to driveways and yard areas. Roger has more than 35 years in concrete, so the parts that decide how long a slab lasts (set-out, base, reinforcement and finishing) are done properly before anyone picks up a float. You deal with one crew from set-out to clean-up, and you get a slab that sits level, drains where it should and is built to limit cracking rather than invite it.

  • Site set-out and formwork
  • Mesh and reinforcement placed to specification
  • Pour, screed and finish
  • Control joints and curing
  • Clean-up and spoil removal
Freshly poured concrete roadway and kerb at an industrial site in Wingfield, with a power trowel finishing the slab

Exposed Aggregate Concrete

Exposed aggregate concrete for Adelaide driveways, paths and entertaining areas. Hard-wearing, with grip.

Exposed aggregate concrete for Adelaide driveways, paths and outdoor entertaining areas. The top layer of cement paste is washed away to reveal the stone in the mix, giving a textured, hard-wearing surface with more grip underfoot than smooth concrete. Timing the wash-off is what separates an even finish from a patchy one. You pick the aggregate blend, and the finished surface is cut with control joints and sealed.

  • Choice of aggregate blends
  • Surface washed off at the right stage
  • Control joints cut
  • Sealed on completion
Newly finished exposed aggregate concrete driveway with a centre control joint, leading to the garage of a red brick home

Concrete Repair

Concrete repair in Adelaide for cracked, broken or sunken concrete, before it becomes a bigger job.

Concrete repair in Adelaide for cracked, broken, lifted or sunken slabs, paths and floors. The first job is working out why it failed (ground movement, a poor base, tree roots or overloading), because patching over the cause just brings the crack back. Minor damage can be patched or resurfaced. Badly damaged sections are cut out and replaced so they sit flush with the surrounding concrete and the trip hazard is gone.

  • Crack assessment and repair
  • Break-out and replacement of damaged sections
  • Patching and resurfacing
  • Trip-hazard removal
Replaced section of concrete floor, finished flush, between steel racking frames in front of an insulated door

Concrete Cutting

Concrete cutting in Adelaide for openings, trenches, joints and removals in slabs and walls.

Concrete cutting in Adelaide for new openings, trenches, joints and removals in slabs and walls. Saw cutting leaves a straight, clean edge and does far less damage than breaking concrete out by hand, so the surrounding slab stays sound. Common jobs include trenches for plumbing and services, doorway openings, control joints in new slabs, and sections cut out for removal and replacement.

What's included

  • Floor and slab sawing
  • Control joint cutting
  • Openings for doors and trenches
  • Removal of cut sections

Get a quote for concrete cutting

Excavation and Site Cuts

Excavation and earthmoving in Adelaide: site cuts, trenching and earthworks for building and civil jobs.

Excavation in Adelaide for construction and civil projects, covering site cuts, levelling, trenching and bulk excavation. Getting the excavation and the concrete from one contractor means the ground is prepared for exactly what's going on it, with no gap between trades for things to go wrong. Spoil is taken away, and cuts and trenches are backfilled and compacted ready for the next stage.

  • Site cuts and levelling
  • Trenching for services and footings
  • Bulk excavation
  • Spoil removal
  • Backfill and compaction
Deep bulk excavation with vertical cut walls, an excavator working from the top edge beside a commercial building

Underground Storage Tank (UST) Removal and Installation

Underground storage tank removal and installation in Adelaide, from excavation to reinstatement.

Underground storage tank removal and installation in Adelaide for fuel and water tanks on commercial, industrial and rural sites. For removals, the tank is excavated, lifted out and taken away, with soil testing coordinated with your environmental consultant before the hole is backfilled and the site reinstated. For new tanks, excavation, bedding, placement and backfill are handled as one job.

  • Excavation and tank lift-out
  • New tank bedding and installation
  • Soil testing coordination
  • Backfill and site reinstatement
Excavator lifting a large ribbed steel underground storage tank out of the ground on a cleared commercial site

View all 18 services

Concrete slabs built to spec, from the base up

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.
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.
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.
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.

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

Based in Cavan, we work from the northern suburbs through to south of the city. Jobs within about 20km of the yard carry no travel charge. Further out we add a fee to cover the drive, and it is on your quote before you commit to anything.

  • Adelaide CBD
  • Burton
  • Cavan
  • Direk
  • Dry Creek
  • Edinburgh Parks
  • Elizabeth South
  • Gepps Cross
  • Green Fields

See all service areas

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 have kept it deliberately small since — the two of them and a crew of two, 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. That is also why we turn work down when the diary is full: we would rather lose a job than hand it to someone we have not worked with.

  • 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.

  • Why we stay small

    Four people means we know what every job looks like without a meeting about it. It caps how much we take on, and we are fine with that.

  • 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.

  1. Get in touch

    Call Roger or send the job details through the form.

  2. Free site visit

    Where the job needs it, we come out and measure up at no cost.

  3. Your quote

    A clear price for the scope, including any fee to drive to sites outside our usual Adelaide coverage.

  4. Book in and build

    We schedule the work and see it through from ground prep to finish.

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

Get a free quoteCall