Skip to main content
Tiered charcoal concrete sleeper retaining walls built by Retain by Theo in Wollongong
Retain by Theo

Retaining Wall Installation in Wollongong

Retaining walls crafted strong and properly engineered, along with excavation and drainage solutions.

Get a Free Quote
Fully Engineered & Certified
Free On-Site Quotes
Trading Since 2020
Grey timber-look concrete sleeper retaining wall built by Retain by Theo in Wollongong

Crafted. Strength. Engineered.

At Retain by Theo, we design and build retaining walls that are crafted, strong and properly engineered for the ground they hold. Trading since 2020 and based in Wollongong, we work across the wider Illawarra for homeowners, business owners and project managers who want the job done once and done right.

Our work covers engineered retaining walls in every material — durable concrete sleeper, natural timber and heavy-duty besser block walls — along with the excavation and earthworks that prepare the site and the landscaping that keep water pressure off the wall for good.

Clear communication, quality materials and a clean, modern finish on every job. Call 0417 661 224 for a free, no-obligation quote.
  • QBCC licensed builders
  • Local Illawarra expertise
  • Transparent fixed-price quotes
  • End-to-end project management

Our Services

Retaining Walls designed and built by Retain by Theo across Wollongong and the Illawarra

Retaining Walls

We design and build engineered retaining walls across Wollongong, from low garden terracing to tall structural work, with certified drawings, council paperwork, full drainage and a clean, lasting finish on every block we work on.

Learn more
Concrete Sleeper Retaining Walls designed and built by Retain by Theo across Wollongong and the Illawarra

Concrete Sleeper Retaining Walls

Want a wall that never rots, warps or needs painting? Our concrete sleeper retaining walls pair galvanised steel posts with certified footings and full drainage, in colours and profiles you choose.

Learn more
Timber Retaining Walls designed and built by Retain by Theo across Wollongong and the Illawarra

Timber Retaining Walls

Treated pine rated for in-ground use, plus durable hardwood, go into the timber retaining walls we build, repair and replace. Structural fixings, protected posts and proper drainage give the timber its longest life.

Learn more
Besser Block Retaining Walls designed and built by Retain by Theo across Wollongong and the Illawarra

Besser Block Retaining Walls

Heavy driveways, pools and boundary structures push a wall hard. Core filled besser block retaining walls answer that, with steel reinforcement through every core, engineered footings and rendered, bagged or face finishes.

Learn more
Excavation & Earthworks designed and built by Retain by Theo across Wollongong and the Illawarra

Excavation & Earthworks

Before anything gets built, the ground has to be right. Our excavation and earthworks crew handles site cuts, bulk digs, trenching and clearing, with narrow machines for the tightest Illawarra access.

Learn more
Landscaping designed and built by Retain by Theo across Wollongong and the Illawarra

Landscaping

A finished wall is only half the job, so our landscaping ties the whole yard together with turf, garden beds, pathways and edging that suit how you actually use the space.

Learn more
Deck Builder designed and built by Retain by Theo across Wollongong and the Illawarra

Deck Builder

Outdoor living starts underneath the boards, so our deck building covers footings, framing, stairs and balustrades, in hardwood, treated pine or composite, built level and square on Wollongong blocks.

Learn more
Retaining wall trench prepared for footings by Retain by Theo in Wollongong

Tell us about your project

Engineered block retaining wall completed by Retain by Theo across the Illawarra

Why Choose Retain by Theo?

Choosing who builds your retaining wall comes down to structural integrity, straight answers and a finish you are still happy with in ten years. At Retain by Theo, we have been building crafted, engineered retaining walls across Wollongong and the Illawarra since 2020, and every job is run the same way. Here is what sets us apart:

  • Certified structural engineering and council approvals arranged for every wall that needs them
  • Complete drainage systems built into every retaining wall as standard, never as an extra
  • Quality materials specified for coastal Illawarra conditions and long-term durability
  • Clear communication from first site visit to final clean-up, direct with Theo
  • Free, no-obligation quotes and honest advice on the right wall for your block
Talk to the Team
Retain by Theo installing steel posts for a concrete sleeper retaining wall on a Wollongong site

Start your project today with confidence.