25 Undercliffe StreetDee Why NSW 2099
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.
Last Listing description (April 2026)
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
Property History for 25 Undercliffe St, Dee Why, NSW 2099
- 21 Oct 2025Listed for Sale For Sale Guide $4,750,000
- 13 Sep 2022Sold for $2,470,000
- 05 Jul 2022Listed for Sale Contact Agent
Recent sales nearby
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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 13,230 properties. Over the last 5 years, Houses in Dee Why have seen a 25.54% increase in median value, while Units have seen a 26.09% increase. As at 31 March 2026:
- The median value for Houses in Dee Why is $2,835,669 while the median value for Units is $1,121,092.
- Houses have a median rent of $1,300 while Units have a median rent of $780.
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