Western Sydney Rental Yields — The Real 2026 Numbers

Granny flat rental yields in Western Sydney 2026 are consistently 9-17% on build cost — multiples higher than yields on equivalent purchased units.

Market rents for 2-bed granny flats (Buildana data + REIA rental snapshot Q1 2026): • Fairfield: $400-$480/week • Liverpool: $420-$500/week • Canterbury-Bankstown: $400-$490/week • Cumberland: $390-$470/week • Blacktown: $380-$460/week

New granny flats command a $30-$60/week premium over older ones (5+ years). Premium narrows as the building ages but never fully disappears if the build is quality.

Yield Calculations — Worked Examples

2-bed Fairfield (build cost $180,000, rent $440/week): • Annual gross rent: $22,880. • Operating costs (insurance increment $400, rates increment $600, agent fee at 7.5% $1,716, vacancy 2 weeks $880, repairs $500): roughly $4,100/year. • Net rent: ~$18,780. • Net yield on build cost: 10.4%.

2-bed Liverpool (build cost $195,000, rent $460/week): • Annual gross rent: $23,920. • Operating costs: ~$4,300/year. • Net rent: ~$19,620. • Net yield on build cost: 10.1%.

Compare to purchasing a $420,000 2-bed unit at $380/week: • Gross yield 4.7%, net yield typically 3-3.5% after strata, rates, agent.

Net yield gap is 3× higher on the granny flat. That is before counting capital growth, which works in your favour on both but starts from a lower base on the granny flat (build cost), not from market value.

Maximising Yield — What's Worth the Money

Build 2-bed rather than studio or 1-bed. Incremental cost $30k-$55k over a studio, incremental rent $80-$110/week. ROI on the size upgrade alone is 10-19%.

Air conditioning. Reverse-cycle split system in living + bedrooms. Cost $2,500-$4,000. Adds $20-$30/week rent. Payback 1.5-3 years. We include this on every Buildana investment-grade build.

Separate electrical meter. Costs $1,500-$2,500 to install at construction. Means tenants pay their own electricity (you don't get caught with a tenant running 3 air-cons 24/7 on your bill). Also clarifies the dwelling as 'genuinely separate' for valuation purposes.

Privacy fencing between the main house and the granny flat. $3,000-$6,000. Adds $15-$20/week rent and reduces vacancy because tenants strongly prefer 'feels like own property'.

Quality finishes — stone benches, dishwasher, NBN connection, decent window furnishings. Adds $20-$30/week vs base spec. Worth $4-$6k of extra build cost easily.

Covered alfresco — 10-15 sqm. Adds $10-$15/week and reduces vacancy in summer letting. Doesn't count toward the 60 sqm internal cap.

Payback Periods on the Whole Build

Build cost $180k, net rent $18,780/year. Simple payback ignoring time value: ~9.6 years.

But payback ignores capital gain. With 5% annual property appreciation on the granny flat's portion of valuation uplift ($130k average), you're adding $6,500/year of capital growth on top of the $18,780 net rent — total economic return $25,280/year.

Real payback (including capital): ~7 years on the rent + capital basis.

And once paid back, the asset keeps generating rent and capital indefinitely.

Contact Buildana for a free site assessment and a costed projection specific to your block and suburb.

If the numbers stack up for your site, the next call is layout. Our 47 granny flat designs at /homes/granny-flats/designs are tagged by bedroom count and floor area so you can pick the plan that maximises rentable space without blowing the build cost.