25 Undercliffe Street, Dee Why, NSW 2099 | Property Value & History | OnTheHouse
 
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25 Undercliffe Street
Dee Why NSW 2099

Bedrooms: 4
Bathrooms: 3
Car spaces: 2
Floor area: 160m2
Land area: 402m2
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Last updated 8 Dec 2025
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Property Details for 25 Undercliffe St, Dee Why

25 Undercliffe St, Dee Why is a 4 bedroom, 3 bathroom House with 2 parking spaces and was built in 1940. The property has a land size of 402m2 and floor size of 160m2. While the property is not currently for sale or for rent, it was last sold in September 2022.

Building Type
House
Year Built
1940
Floor Size
160m2
Land Size
402m2
Local Government
Northern Beaches
Lot/Plan
64/DP7435

Last Listing description (December 2025)

A showcase of contemporary coastal design and environmental innovation, this award-winning home on Undercliffe Street redefines sustainable luxury. Winner of the 2025 HIA GreenSmart Home of the Year, it stands as a benchmark for integrity, design excellence and performance. Designed and built to certified Passive House EnerPHit standards, the home retains and reimagines its original structure, combining architectural sophistication with an exceptional commitment to sustainability. Powered by a 10kW solar system and 12kW battery, it functions largely off-grid, with intelligent energy automation ensuring year-round comfort and efficiency. Every finish has been carefully chosen for ethical, low-emission or recycled credentials, while the architecture itself embraces its north-facing block with spectacular ocean and district views, and natural materials that blend seamlessly into the coastal setting. With open-plan living flowing to an ocean-facing terrace, landscaped gardens, a private teen or guest retreat and a serene master suite, this is elevated coastal living, delivering a beautifully balanced fusion of form, function and conscience.

- Architectural home designed to Passive House EnerPHit standards
- Award-winning 2025 HIA GreenSmart Home of the Year residence

- North-facing block capturing panoramic ocean and district views
- Sustainably built using Global Greentag and FSC-certified materials
- Operates almost off-grid via 10kW solar system and 12kW battery
- High-performance HVAC with filtered, temperature-controlled airflow
- Open-plan living and dining extends to ocean-facing entertaining terrace
- Master retreat with study, ensuite and access to private rear garden
- Retreat level with three bedrooms, wet bar and private north balcony
- Pristine bathrooms with underfloor heating and additional powder room
- GreenTag-certified flooring, cabinetry, paint, tiles and carpets throughout
- Double-glazed German windows ensure comfort and acoustic insulation
- Rainwater collection tanks, organic waste systems, green roof garden
- Recycled concrete aggregate and carpet made from recycled fish nets
- Double garage with EV charger, mezzanine storage and mini gym
- Moments to Dee Why and North Curl Curl beaches, cafs and transport
- Multiple living areas and generous proportions offer flexibility for households, with the potential for dual occupancy, multi-generational living or private teenage retreat

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Property History for 25 Undercliffe St, Dee Why, NSW 2099

A timeline of how this property has performed in the market
Last Sold
$2,470,000
13 Sep 2022
Listed for Rent
$780/w
11 Sep 2019
  • 21 Oct 2025
    Listed for Sale For Sale Guide $4,750,000 - $5,225,000
  • 13 Sep 2022
    Sold for $2,470,000
  • 05 Jul 2022
    Listed for Sale Contact Agent
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About Dee Why 2099

The size of Dee Why is approximately 3.4 square kilometres. It has 11 parks covering nearly 15.0% of total area. The population of Dee Why in 2016 was 21518 people. By 2021 the population was 23354 showing a population growth of 8.5% in the area during that time. The predominant age group in Dee Why is 30-39 years. Households in Dee Why are primarily childless couples and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Dee Why work in a professional occupation.In 2021, 50.20% of the homes in Dee Why were owner-occupied compared with 50.30% in 2016.

Dee Why has 13,158 properties. Over the last 5 years, Houses in Dee Why have seen a 50.77% increase in median value, while Units have seen a 34.98% increase. As at 30 November 2025:

  • The median value for Houses in Dee Why is $2,847,257 while the median value for Units is $1,100,000.
  • Houses have a median rent of $780 while Units have a median rent of $750.
There are currently 47 properties listed for sale, and 49 properties listed for rent in Dee why on OnTheHouse. According to Cotality's data, 612 properties were sold in the past 12 months in Dee why.

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Cotality Copyright and Legal Disclaimers about Property Data

© Copyright 2025. RP Data Pty Ltd trading as Cotality (Cotality). All rights reserved. No reproduction, distribution, or transmission of the copyrighted materials is permitted. The information is deemed reliable but not guaranteed.

Disclaimer
The Cotality Data provided in this publication is of a general nature and should not be construed as specific advice or relied upon in lieu of appropriate professional advice.

While Cotality uses commercially reasonable efforts to ensure the Cotality Data is current, Cotality does not warrant the accuracy, currency or completeness of the Cotality Data and to the full extent permitted by law excludes all loss or damage howsoever arising (including through negligence) in connection with the Cotality Data.

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