21 Countess Street, Mosman NSW 2088
4 bed2 bath0 car251 m² land282 m² floorBuilt 1907
Swimming poolOutdoor entertaining deckHome officeDouble garage
PropertyCheck estimate
$5,965,000
as at Jun 2026
Statistical model estimate, not a professional valuation. Range reflects a ±10.8% model deviation based on 6 comparable sales. Do not rely on it for lending or legal decisions.
Rental estimate
$1965/wk
Range $1810–$2120 · gross yield 1.7%
Buying costs snapshot
Stamp duty ≈ $345,419 (NSW)
Repayments ≈ $28,304/mo (80% LVR, 5.9%, 30y)
Estimated value over time
Today's estimate carried back along the Mosman house price index.
Sales history
| Date | Sale price | Change |
|---|---|---|
| 3 Feb 2023 | $4,475,000 | +11% |
| 17 Oct 2018 | $4,037,500 | — |
The evidence behind this estimate
Recent comparable sales, indexed to today and adjusted for attribute differences. This is the transparency most estimators keep behind a paywall.
103 Killarney Street, Mosman
House · 4 bed · 3 bath · 1 car · 231 m² · 1.9 km away
$5,443,000
25 May 2025
≈ $5.72m adjusted
23 Wolseley Road, Mosman
House · 4 bed · 2 bath · 2 car · 312 m² · 0.6 km away
$5,923,000
18 Jan 2025
≈ $5.62m adjusted
45 Awaba Street, Mosman
House · 4 bed · 3 bath · 2 car · 236 m² · 0.5 km away
$5,347,000
13 May 2024
≈ $5.62m adjusted
93 Muston Street, Mosman
House · 4 bed · 1 bath · 2 car · 215 m² · 1.4 km away
$6,796,500
25 Feb 2026
≈ $7.08m adjusted
165 Bullecourt Avenue, Mosman
House · 3 bed · 2 bath · 1 car · 228 m² · 0.7 km away
$4,296,500
14 Apr 2024
≈ $5.74m adjusted
155 Raglan Street, Mosman
House · 4 bed · 3 bath · 2 car · 329 m² · 0.6 km away
$7,248,000
13 Jul 2025
≈ $6.30m adjusted