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Opal Construction LTD — Adelaide Concreting Specialists
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  • Modbury
Opal SA Construction Logo

Opal SA Construction is your premier local Adelaide concrete contractor. We specialize in delivering high-quality residential, commercial, and industrial concreting solutions with precision, durability, and trust. Fully insured.

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Monday - Saturday
8am - 5pm

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  • Adelaide, South Australia, Australia
  • +61 466 801 058
  • support@opalsaconstruction.com

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Our Services

  • Concrete Driveways & Crossovers
  • Concrete Patios & Entertaining
  • Exposed Aggregate Concrete
  • Coloured Concrete Finish
  • Swimming Pool Surrounds
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Adelaide Service Areas

We service residential & commercial concrete jobs across Adelaide suburbs including:

  • Para Vista South Australia
  • Croydon Park South Australia
  • Munno Para South Australia
  • Angle Vale
  • Salisbury South South Australia
  • Gawler
  • Ingle Farm South
  • Modbury South Australia
View all 14+ suburbs

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Check Our Credentials

ABN91 650 655 360

BLD317725 (Builder License)

🏆 Fully Insured - $20M Public Liability

🏛️ Work Completed to Australian Standards (AS 3600, AS 1379)

⭐ 5.0 Google Rating (Verified Reviews)

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Copyright © 2026 Opal SA Construction Pty Ltd. All rights reserved.

Licensed builder operating in South Australia under BLD 317725.
All concreting and construction work completed to Australian Standards (AS 3600, AS 1379).

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Retaining Walls Adelaide | Opal Construction LTD

Adelaide · Modbury South Australia

Retaining walls Modbury South Australia

Licensed concrete specialists serving Modbury South Australia and surrounding suburbs. BLD 317725 · Free on-site quote within 48 hours.

Call 0466 801 058Free Quote

Modbury, including Tea Tree Gully North, Modbury Heights, Modbury North, and the surrounding areas, occupies gently hilly terrain in Adelaide's north-eastern suburbs approximately 14 kilometres from the CBD in the City of Tea Tree Gully. It is one of Adelaide's most complete suburban centres, anchored by the Tea Tree Plaza shopping precinct, with good public transport (O-Bahn), medical services, and schools. Homes range from 1960s and 1970s red brick on established lots to more recent dual-occupancy and infill townhouses on subdivided allotments.

The topography across Modbury is more varied than in the flatter northern suburbs. Many streets on the ridgelines and slopes require sloping driveway designs, and drainage planning is important — particularly on blocks that fall toward the house rather than away from it. We always confirm fall direction and drainage exit points as part of the free site measure, and we recommend channel drains in any situation where water could sit against the house footings or garage slab.

Soil conditions in Modbury are generally clay-based, with increasing rock presence toward the hills. On elevated streets near Modbury Heights, subgrade can transition from workable clay to shallow rock within 100–200mm of the surface, which affects excavation cost. We probe for rock as part of the site assessment for these streets and include any additional rock-break cost in the written quote before starting work.

Modbury has a strong renovation market. Homeowners in this area frequently request exposed aggregate driveways as part of modernisation projects on 1960s–1980s brick homes — the textured finish dramatically updates the street presentation of an older home. Coloured concrete in iron oxide red or charcoal is also popular for matching brick tones. Pool surrounds are another significant project type given the prevalence of in-ground pools in Modbury's larger backyard homes.

The City of Tea Tree Gully administers Modbury. Driveway crossover permits are required before any kerb modification. We lodge this application on your behalf. Call Javed on 0466 801 058 for a free measure and written quote within 48 hours.

SA Licence BLD 317725Fully InsuredOwn Trained CrewFree On-Site Quote
FinishPrice (installed)
Plain grey broom$75–$95 / m²
Coloured / oxide concrete$95–$120 / m²
Exposed aggregate$140–$200 / m²

All prices are fully installed and include excavation, compacted roadbase, reinforcement mesh, concrete placement, finishing, control joints, curing compound, and site cleanup. For non-standard sites requiring extra excavation, removal of existing concrete, or heavy compaction work, an additional base preparation charge of $20–$50/m² applies — quoted separately before any work begins.

OPAL SA Retaining Walls

OPAL SA Retaining Walls

We live in a city of hills, sloping blocks and soil that loves to slide after a big winter storm. That’s why Opal SA Construction builds Adelaide retaining walls that hold back earth, channel water and still look like a garden feature not a fortress. From a neat garden edge in Prospect to a two metre wall taming a Marion hillside, we pour concrete, stack stone and add colour so your yard stays put and looks the part. One local crew, one fixed price, one rock solid wall, guaranteed for life.

Installation, Maintenance & Repair

Installation, Maintenance & Repair

Installation

Pick a date and we’ll be there with shovels, laser levels and a playlist you can actually hum along to. We dig, set steel posts, pour the concrete or stack the stone, back-fill with free-draining gravel and shape the wall so it follows your garden’s natural lines. 


Maintenance

Every couple of years we’ll ping you with a quick text: “Ready for a pressure-wash and fresh seal?” Ten minutes with a hose, a stiff broom and our DIY kit keeps moss and salt marks away. Or we’ll swing by while you’re at work, job, no fuss.


Repair

Crack from tree roots, bulge from water build up or chipped cap from the teenager’s skateboard? We cut out the damaged section, match the color and texture, then patch and reseal so the repair disappears and your lifetime warranty stays rock solid.

Why choose Opal SA for your Adelaide retaining wall?

Why choose Opal SA for your Adelaide retaining wall?

  • Designed by locals, built for locals: We turn up in a dusty ute, coffee in hand, and walk your block with you. We check the slope, poke the soil and sketch a wall that sits right, drains right and looks like it grew there.

  • Strong and pretty: Sure, it has to hold back a hill of clay, but it should also frame your roses. We blend steel, concrete and stone.

  • Peace of mind promise: Every block is engineered, every post is steel-reinforced and every pour is signed off by our ticketed crew. If it shifts or leaks, we’re back no arguments, no extra invoices.

Benefits of Choosing Opal SA Concrete Retaining Walls

Benefits of Choosing Opal SA Concrete Retaining Walls

  • Turn steep into useful: A slope that once spilled soil onto the lawn becomes a flat veggie patch, a fire pit deck or extra play space for the kids. We laser-level every footing and add hidden drainage so the new terrace stays level and solid.

  • Stop erosion in its tracks: Adelaide storms can send a hillside sliding. Our walls are built with weep holes and free draining gravel that take the pressure off the soil behind them so your garden (and your neighbor's fence) stays put.

  • Your wall, your style: Plain grey for a clean look, charcoal for a modern edge, exposed aggregate for texture, or stone veneer for rustic charm. The color runs right through the concrete, so chips never show.

  • Low upkeep, long life: No repainting, no replacing rotten sleepers. A quick sweep and hose once a year is all it takes. The sealed surface shrugs off salt, sun and soil movement for decades.

Get a Free Retaining walls Quote in Modbury South Australia

Call Javed on 0466 801 058 or fill in the form. Written quote within 48 hours.

Call NowOnline Form

Service Areas

We proudly provide our services in the following areas:

  • Para Vista South Australia
  • Croydon Park South Australia
  • Munno Para South Australia
  • Angle Vale
  • Salisbury South South Australia
  • Gawler
  • Ingle Farm South
  • Modbury South Australia
  • Virginia
  • Mansfield Park South Australia
  • Adelaide
  • Rostrevor South Australia
  • Paralowie South Australia
  • Burton South Australia

Opal SA Construction

Licensed concrete contractors serving Modbury South Australia and surrounding Adelaide suburbs. BLD 317725 · fully insured · free on-site quote within 48 hours.

Service Area: Modbury South Australia, Adelaide SA

Licence: BLD 317725

Contact : 0466 801 058

Email : support@opalsaconstruction.com

Other Concreting Services in Modbury South Australia

Driveways & CrossoversProfessional service in Modbury South AustraliaColorbond FencingProfessional service in Modbury South AustraliaConcrete PatiosProfessional service in Modbury South AustraliaEarthworkProfessional service in Modbury South AustraliaShed & Garage SlabsProfessional service in Modbury South AustraliaPergolasProfessional service in Modbury South Australia

Also Serving Nearby Suburbs

Para Hills →Golden Grove →Tea Tree Gully →Campbelltown →All Retaining walls →

Useful Guides

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  • Concreting in Adelaide Summer Heat — What You Need to Know
  • View all concreting guides →