How Much Does a Farm Dam Cost in Australia?

A farm dam in Australia costs from $10,000 per megalitre for a 1–4 megalitre earth dam, with volume pricing for larger projects. A complete new dam — including site inspection, design, and construction — typically ranges from $15,000 for a small 1 ML farm dam to $80,000+ for a 10+ megalitre storage. All Big Ditch prices are fixed-price with a 10-year guarantee.

Big Ditch Pricing — What You’ll Pay

  • Site Inspection: $500 + GST — We visit your property and assess site suitability
  • Dam Design: $2,750 + GST — Full hydrological design to Australian standards
  • Construction (1–4 ML): $10,000 per megalitre + GST
  • Construction (4–8 ML): $6,000 per megalitre + GST
  • Construction (8–12 ML): $5,000 per megalitre + GST
  • Construction (12+ ML): $4,000 per megalitre + GST

Note: Prices are fixed. No hidden costs. All quotes are all-inclusive.

What’s Included in the Price?

Every Big Ditch construction price includes full earthworks, compaction, spillway design and construction, and site cleanup. We do not add fuel levies, mobilisation fees, or hidden charges after the quote is signed. If the price changes, you will know before work begins.

What Affects the Cost of a Farm Dam?

  • Dam size (megalitres of storage capacity)
  • Distance from our base to your property
  • Site geology and soil compaction requirements
  • Access to the site for machinery
  • Whether a clay liner, bentonite sealing, or HDPE liner is required
  • Spillway design complexity
  • Any tree clearing or site preparation required

NSW Government Rebates — Get 25% Back

NSW landowners may be eligible for a 25% rebate on dam construction costs through the NSW Rural Assistance Authority (RAA). Big Ditch can advise on eligibility during your site inspection. This effectively reduces your all-in cost by a quarter — a significant saving on projects over $20,000.

Is a Farm Dam Worth the Investment?

A well-built dam adds measurable value to rural and lifestyle properties. Independent real estate agents consistently report that properties with reliable, well-maintained water storage achieve higher sale prices and sell faster. Beyond financial return, a dam provides water security, wildlife habitat, irrigation capacity, and — for lifestyle properties — a genuinely beautiful feature that defines the land.

Frequently Asked Questions

How much does a 1 megalitre dam cost?

A 1 megalitre earth dam costs approximately $10,000–$13,000 + GST for construction, plus $500 for a site inspection and $2,750 for design if required. Total all-in budget: approximately $15,000–$16,000 + GST.

How much does a 5 megalitre dam cost?

A 5 megalitre dam falls into the volume pricing tier at $6,000/ML. Construction costs approximately $30,000 + GST. Add site inspection and design for a total of approximately $33,250 + GST.

Do dam prices include GST?

All Big Ditch prices are quoted exclusive of GST. Add 10% for the GST component.

Can I get a fixed-price quote for my dam?

Yes. Big Ditch is Australia’s only professional dam builder offering fully fixed-price contracts. Your quote will not change after signing unless you request additional work.