Excavation and earthmoving in Tweed Heads

Earthmoving around Tweed Heads, run by the operator

Dirt Werks is Luke, an owner-operator based in Murwillumbah. In the Tweed Heads area he covers the town itself, Tweed Heads South, Banora Point, Terranora, Bilambil and Chinderah. He quotes each job and runs the machines himself: a 5.5 t class Kubota U55-4 excavator, an ASV RT-60 posi-track and a Fuso Fighter tipper that carries about 7.5 t a load. If you want an excavator or digger with an operator in Tweed Heads, the person you explain the job to is the person in the seat.

The ground changes a lot in a short drive. Chinderah and Tweed Heads South are low, flood-prone land beside the Tweed River, and NSW groundwater notes describe the floodplain soils as estuarine sediments and alluvium. Sand dunes run along the coast from Point Danger to Cudgen Headland. Behind the flats, the land climbs to the ridges of Terranora and Bilambil Heights. On low ground the questions are water, acid sulfate soils and flood levels. On the hills they are slope, access and stability.

Low ground: acid sulfate soils, water and fill

Tweed Shire Council says acid sulfate soils are common along the Tweed Coast. NSW groundwater notes explain where they come from: marine and estuarine sediments rich in pyrite. When drainage lets air in, the pyrite oxidises to sulfuric acid and the soil pH can fall below 4. Council says written approval is needed in most cases before these soils are disturbed. Its management plan for minor works can't be used where groundwater is likely to be disturbed or dewatering is likely. Those jobs need a site-specific plan.

Water can sit close to the surface. The same groundwater notes rate land with a water table less than 5 m down, shallow soil, low slope and permeable ground as highly vulnerable, and say it is found particularly along the unconsolidated sands of the coastal foreshores. A trench, tank hole or drain on low land may meet water before it reaches the depth on the plan, so tell Luke if you've seen water sitting in post holes, garden beds or nearby digs.

If the plan is to raise a low yard with fill, check first: Council says filling land needs development consent in most cases. In Chinderah Village, north-west of the Pacific Highway, Council's flood plan allows only minor filling for drainage. Flood planning levels were revised on 4 March 2026 in line with the Tweed Valley Flood Study Update and Expansion 2024, and they change as flood studies are updated. Get a Section 10.7 certificate and a Property Flood Report for your lot before any fill is ordered.

Flooding: why drainage comes first on the flats

Council's flood plan says flooding in the Tweed Heads area can come from local rain, high tides, the Broadwater creeks, the Tweed River and ocean surge, in any combination. It names the 1954 flood as the highest recorded here, at 2.51 m AHD near the river mouth. NSW SES says Tweed Heads South and Banora Point can flood from local runoff or from backwater out of Terranora Broadwater or the Tweed River. It says Seagulls Estate at Tweed Heads West is particularly vulnerable, with up to 1.5 m of floodwater in major events, and that 'flooding is a certainty' in Chinderah.

For earthworks, that puts drainage first. Before a new ag drain or stormwater line goes in, settle with your plumber where it will discharge. Luke digs and backfills the trench, and your licensed plumber lays the pipe and connects it. To count as exempt development under the NSW standards, earthworks and retaining walls must not redirect surface or ground water or carry sediment onto a neighbour's land, and must be at least 40 m from natural water. On a canal or riverfront lot, check with Council before assuming a small cut or fill is exempt.

Steep blocks: Terranora and Bilambil Heights

Council's flood plan names Terranora and Bilambil Heights as natural high ridges that stay above even the largest flood that could conceivably occur, though floodwater can surround them. The slope brings its own problems. NSW SES says steep urban development towards Terranora makes Tweed Heads South and Banora Point susceptible to local flash flooding. The 2022 flood caused two major slips on Scenic Drive at Bilambil Heights, and Council's repair bored concrete piles as far as 5 m down to anchor on bedrock and placed more than 900 tonnes of rock in boulder retaining walls.

Tweed DCP 2025 (section D1) says earthworks more than 0.6 m above or below existing ground need a retaining wall or other support, anything over 1 m needs a structural engineer's design, and batters can be no steeper than 1:2 unless a geotechnical report satisfies Council. No cut or fill is allowed in easements. Those levels are for your builder, engineer or certifier to settle. For trenching, stump removal, a gravel drive or soil removal on a slope, send Luke photos of the slope, the driveway and where the machine and the tipper could stand.