9/21 Guilfoyle Avenue, Double Bay NSW 2028
Double Bay Unit
Technical details
How this sale compares
Sold for $1,460,000 in Apr 2025, up $385,000 (36%) on the $1,075,000 paid in Aug 2020. That is about 6.8% a year over 4.7 years.
Over the same period the median unit price in Double Bay rose 43%, from $1,542,500 in 2020 to $2,200,000 in 2025.
The 2025 sale was 34% below the Double Bay median unit price for that year ($2,200,000 across 113 sales).
Since then the median unit price in Double Bay has risen 5%, from $2,200,000 in 2025 to $2,300,000 over the last 12 months (69 sales).
Double Bay medians use NSW Valuer General sales of $50,000 or more, leaving out part-interest transfers and contracts covering several properties, and need at least 10 sales in the period. See Double Bay sold prices by year.
Rent and yield
Units in postcode 2028 rented for a median $1,050 a week, from 331 bonds lodged Oct 2025 to Sep 2026.
On its last sale of $1,460,000 on 10 Apr 2025, that rent is a gross yield of 3.7% a year, before costs and vacancies.
Median weekly rents from residential rental bonds lodged with NSW Fair Trading, by postcode. This home's own rent may differ. See rents by bedrooms in Double Bay.
Related sales
Sale history
Sold is the contract date, when the sale was agreed. Settled is the date ownership transferred.
| Beds | Baths | Cars | Title reference | |||
|---|---|---|---|---|---|---|
| 10 Apr 2025 | 22 May 2025 | $1,460,000 | - | - | - | 9/SP40012 |
| 4 Aug 2020 | 15 Sep 2020 | $1,075,000 | - | - | - | 9/SP40012 |
| 6 Nov 2018 | 30 Jan 2019 | $1,105,000 | - | - | - | 9/SP40012 |
$1,460,000 Sold 10 Apr 2025
Settled22 May 2025
Beds-
Baths-
Cars-
Title reference: 9/SP40012
$1,075,000 Sold 4 Aug 2020
Settled15 Sep 2020
Beds-
Baths-
Cars-
Title reference: 9/SP40012
$1,105,000 Sold 6 Nov 2018
Settled30 Jan 2019
Beds-
Baths-
Cars-
Title reference: 9/SP40012
Other sales at 21 Guilfoyle Avenue
The most recent sales of other units in this building. See every sale in the building.
| Beds | Baths | Cars | Title reference | ||||
|---|---|---|---|---|---|---|---|
| 7 | 15 Dec 2025 | 27 Jan 2026 | $1,500,000 | - | - | - | 7/SP40012 |
| 3 | 20 Aug 2025 | 18 Nov 2025 | $1,925,000 | - | - | - | 3/SP40012 |
| 5 | 3 Mar 2025 | 7 Mar 2025 | $1,300,000 | - | - | - | 5/SP40012 |
| 7 | 14 Dec 2024 | 28 Jan 2025 | $1,300,000 | - | - | - | 7/SP40012 |
| 8 | 21 Sep 2021 | 1 Nov 2021 | $1,575,000 | - | - | - | 8/SP40012 |
| 6 | 28 Sep 2018 | 14 Dec 2018 | $1,085,000 | - | - | - | 6/SP40012 |
| 1 | 15 Nov 2016 | 20 Dec 2016 | $1,085,000 | - | - | - | 1/SP40012 |
| 3 | 23 Jul 2015 | 3 Sep 2015 | $910,000 | - | - | - | 3/SP40012 |
| 4 | 13 Jul 2015 | 24 Aug 2015 | $850,000 | - | - | - | 4/SP40012 |
$1,500,000 Sold 15 Dec 2025
Title reference: 7/SP40012
$1,925,000 Sold 20 Aug 2025
Title reference: 3/SP40012
$1,300,000 Sold 3 Mar 2025
Title reference: 5/SP40012
$1,300,000 Sold 14 Dec 2024
Title reference: 7/SP40012
$1,575,000 Sold 21 Sep 2021
Title reference: 8/SP40012
$1,085,000 Sold 28 Sep 2018
Title reference: 6/SP40012
$1,085,000 Sold 15 Nov 2016
Title reference: 1/SP40012
$910,000 Sold 23 Jul 2015
Title reference: 3/SP40012
$850,000 Sold 13 Jul 2015
Title reference: 4/SP40012
Recent sales on Guilfoyle Avenue
Sold in the last two years.
- 8/9 Guilfoyle Ave, Double Bay 2028 $1,166,666 sold 9 Oct 2026
- 3/11 Guilfoyle Ave, Double Bay 2028 $7,000,000 sold 20 Apr 2026
- 2/11 Guilfoyle Ave, Double Bay 2028 $10,000,000 sold 10 Oct 2025
- 2/9 Guilfoyle Ave, Double Bay 2028 $1,300,000 sold 3 Mar 2025
- 18 Guilfoyle Avenue, Double Bay 2028 $1,702,000 sold 18 Dec 2024, 158 m²
- 4/11 Guilfoyle Ave, Double Bay 2028 $5,525,000 sold 18 Nov 2024
Recent sales nearby
Sold in the last 12 months within about 400 metres.
- 3 A/2 Knox St, Double Bay 2028 $4,950,000 sold 15 Sep 2026
- 23/337 New South Head Rd, Double Bay 2028 $2,490,000 sold 5 Sep 2026
- 12/17 Knox St, Double Bay 2028 $1,045,000 sold 21 Aug 2026
- 2/95 Darling Point Rd, Darling Point 2027 $3,300,000 sold 12 Aug 2026
- 5/28 William St, Double Bay 2028 $1,860,000 sold 7 Aug 2026
- 7/2 Marathon Rd, Darling Point 2027 $1,910,000 sold 4 Aug 2026
- 6/65 Darling Point Rd, Darling Point 2027 $1,120,000 sold 1 Aug 2026
- 10/30 William St, Double Bay 2028 $1,600,000 sold 31 Jul 2026