The Rent Roll Growth Playbook for Australian Agencies (2026)

Why the rent roll growth question matters

A rent roll is the most valuable asset most agencies will ever build. At 2.8×–3.6× annual GCI in 2026, a 250-door roll generating $700k of management GCI is worth roughly $2.0m–$2.5m. Growing the roll net 8–10% a year doubles the asset in under a decade — not from market timing, but from operational discipline.

Bottom line: Rent roll growth is acquisition minus attrition. Both halves matter. Most agencies obsess over the first and ignore the second — and quietly stand still.

The valuation maths

Rent roll value = annual management GCI × multiple

What drives the multiple up: low historical attrition (under 11%); high average fee (>$2,800/year); diversified owner base; strong PM bench (not dependent on one person); clean trust accounting history.

What drives it down: attrition >20%; reliance on a single PM or BDM; trust account issues or fee-undercutting history; concentration in stratified buildings or single suburbs.

Acquisition + attrition = net growth

At 8% net growth, a 200-door rent roll doubles in roughly 9 years. At 15% net growth, in 5. The same arithmetic works in reverse: a 200-door roll losing 18% to attrition while acquiring 12% shrinks 6% net — and halves its value in 12 years.

The organic acquisition engine

Acquiring a management organically costs $1.8k–$3.2k all-in, including BDM time, marketing, and onboarding. With one capable BDM you should expect 80–140 managements/year (average), 130–180 (good), 180+ (top performer).

Required investment: 1 BDM $145k–$220k loaded; marketing $40–$80k/year; CRM + tools $15–$25k/year; sales enablement $20–$35k/year. Total ~$220k–$360k all-in. At 120 managements/year × $2,800 GCI = $336k of new annual GCI in year 1 (compounding from year 2).

The M&A path: faster, riskier, more expensive per door

Buying a rent roll moves doors fast but introduces integration risk. Expect 8–20% fall-out within 12 months — even with a careful integration.

The maths on M&A: Purchase price = doors × avg fee × multiple. Integration cost = 5–10% of purchase price. Fall-out adjustment = honest 12-month fall-out forecast × purchase price.

Always discount the headline multiple by your honest fall-out forecast. A 3.2× headline that runs 15% fall-out is really paying ~3.76× for the doors that stay.

When M&A makes sense: you have spare PM capacity; the vendor is genuinely retiring; the roll is geographically aligned; you have a proven integration playbook.

The attrition lever no one talks about

Attrition is half the equation and the half most agencies under-measure. A few levers:

Stack three of these and you'll typically pull attrition from 17% to under 11% — equivalent to acquiring 12 doors a year from nothing.

A 12-month growth plan for a 200-door rent roll

• Months 1–2. Measure baseline. True attrition, average fee, owner concentration, PM tenure. Set 12-month target.
• Months 3–4. Hire BDM or develop senior PM into BDM. Stand up CRM, prospecting routine, weekly pipeline review.
• Months 5–6. Roll out quarterly owner review cycle. Train PMs on the script.
• Months 7–8. Implement annual rent review process with comparables data.
• Months 9–12. Re-measure. Track acquisition + attrition monthly. Adjust BDM commission if needed.

Realistic outcome: 22–28 managements acquired in year 1, attrition pulled from 17% to ~13%, net door growth of 6–10%.

The exit lens

Even if you have no plans to sell, run your decisions through the exit lens. The 0.4× difference between a 3.0× and a 3.4× roll on $700k GCI is $280k of agency value sitting on the table.

Closing thought

Rent roll growth isn't a marketing problem or a tech problem. It's a measurement problem. Track acquisition and attrition monthly, invest in both sides of the equation, and the compounding will do the work.