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Sandstone block retaining wall built by Retain by Theo on an Illawarra hillside property

Locations We Service

Engineered retaining wall built by Retain by Theo for a property in Shellharbour

Shellharbour

Coastal soils and new-release estates shape how we build in Shellharbour. We engineer walls for benched blocks, boundary level changes and salt exposure, with certified drainage behind every course we lay.

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Engineered retaining wall built by Retain by Theo for a property in Kiama

Kiama

Every quote starts with the soil. Reactive basalt clay and heavy rainfall through Kiama demand deeper footings, stronger posts and drainage sized properly, so your wall stays plumb for decades.

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Engineered retaining wall built by Retain by Theo for a property in Calderwood

Calderwood

Turn a raw builder's batter into flat, usable backyard. Across Calderwood we retain benched estate platforms and shared boundaries, with certified engineering sized for the surcharge each wall genuinely carries.

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Engineered retaining wall built by Retain by Theo for a property in Dapto

Dapto

Flat estate blocks sit beside sloping older streets, so no two jobs look alike. Our Dapto walls are engineered individually, built on clay-rated footings and backed by full aggregate drainage.

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Engineered retaining wall built by Retain by Theo for a property in Thirroul

Thirroul

Steep escarpment blocks need walls that work as hard as they look. We handle cut faces, terracing and driveway support throughout Thirroul, from certified design right through to final backfill.

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Engineered retaining wall built by Retain by Theo for a property in Huntley

Huntley

Acreage, sheds and long driveways bring their own retaining challenges. Around Huntley we build heavier walls for rural loads, machinery access and the water that runs freely off open ground.

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Engineered retaining wall built by Retain by Theo for a property in Stanwell Park

Stanwell Park

Tight coastal streets, sandy ground and serious slope make access half the job. Homes in Stanwell Park get walls engineered for salt, surcharge and runoff, built using compact machinery and careful planning.

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Engineered retaining wall built by Retain by Theo for a property in Figtree

Figtree

Before we quote, we check fall, soil and where water actually travels. Figtree homes often sit on reactive clay, so footings and ag-line drainage are sized to suit each block.

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Engineered retaining wall built by Retain by Theo for a property in Balgownie

Balgownie

Older homes, mature gardens and tight side access define much of the work here. In Balgownie we rebuild failing walls, terrace gardens and retain driveways without disturbing established planting or lawns.

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Multi-tiered block retaining wall completed by Retain by Theo for a suburban Illawarra home

Retaining Wall Builders Across the Area

At Retain by Theo, we build engineered retaining walls, excavation and drainage right across the Illawarra from our base in Wollongong. Every suburb here presents its own conditions — steep escarpment blocks, reactive clay, coastal sand and newly benched estate platforms — and we plan each wall around the ground it actually has to hold.

We regularly work in Shellharbour, Kiama, Calderwood, Dapto, Thirroul, Huntley, Stanwell Park, Figtree and Balgownie, along with Bulli, Woonona, Helensburgh and the surrounding suburbs.

Not sure whether we cover your street? We almost certainly do. Call us on 0417 661 224 for a free, no-obligation quote and honest advice on what your block needs.

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Curved stone block garden retaining wall edging a flower bed of white and pink petunias