23, Northwick Avenue, Harrow occupies a 571 m² plot as recorded by HM Land Registry.

Of the 27 other houses in this postcode, 25 have recorded plot sizes, and this one ranks as the 9th largest.

23, Northwick Avenue, Harrow has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 16 Jan 2021.

The property is connected to mains gas and has fully double glazed windows. It is heated using a boiler and radiators (mains gas).

Land Registry records and our Estate Agent network show 66 sales of comparable properties within 590 metres of 23, Northwick Avenue, Harrow since 2011.

Most recently, 19, Northwick Avenue, Harrow, HA3 0AA, a freehold house, sold at £800,000 on the 30th January 2026.

Read more about house prices in HA3.

• Sold Jan 2026£800,000 | 4 Bed House19, Northwick Avenue, Harrow, HA3 0AA19, Northwick Avenue, Harrow, HA3 0AA
• Sold Mar 2025£770,000 | 4 Bed House6, Mayfield Avenue, Harrow, HA3 8EU6, Mayfield Avenue, Harrow, HA3 8EU
• Sold Mar 2024£725,000 | 4 Bed House32, Gerard Road, Harrow, HA1 2NE32, Gerard Road, Harrow, HA1 2NE
• Sold Nov 2022£665,000 | 4 Bed House30, Carlton Avenue, Harrow, HA3 8AY30, Carlton Avenue, Harrow, HA3 8AY
• Sold Oct 2022£815,000 | 4 Bed House11, Hawthorne Avenue, Harrow, HA3 8AG11, Hawthorne Avenue, Harrow, HA3 8AG
• Sold Sep 2022£875,000 | 4 Bed House7, Hawthorne Avenue, Harrow, HA3 8AG7, Hawthorne Avenue, Harrow, HA3 8AG
• Sold Feb 2022£656,000 | 4 Bed House1, Northwick Avenue, Harrow, HA3 0AA1, Northwick Avenue, Harrow, HA3 0AA
• Sold Aug 2021£853,500 | 4 Bed House23, Hawthorne Avenue, Harrow, HA3 8AG23, Hawthorne Avenue, Harrow, HA3 8AG
• Sold Apr 2021£680,000 | 4 Bed House26, Northwick Avenue, Harrow, HA3 0AB26, Northwick Avenue, Harrow, HA3 0AB
• Sold Feb 2021£695,000 | 5 Bed House13, Northwick Avenue, Harrow, HA3 0AA13, Northwick Avenue, Harrow, HA3 0AA
• Sold Jan 2021£752,000 | 5 Bed House5, Rushout Avenue, Harrow, HA3 0AS5, Rushout Avenue, Harrow, HA3 0AS
• Sold Sep 2017£620,000 | 4 Bed House33, Hawthorne Avenue, Harrow, HA3 8AG33, Hawthorne Avenue, Harrow, HA3 8AG
• Sold May 2017£790,000 | 4 Bed House20A, Northwick Avenue, Harrow, HA3 0AB20A, Northwick Avenue, Harrow, HA3 0AB
• Sold Jun 2016£658,000 | 4 Bed House46, Woodway Crescent, Harrow, HA1 2NQ46, Woodway Crescent, Harrow, HA1 2NQ
• Sold Mar 2016£820,000 | 4 Bed House21, Hawthorne Avenue, Harrow, HA3 8AG21, Hawthorne Avenue, Harrow, HA3 8AG
• Sold Feb 2016£617,200 | 4 Bed House24, Northwick Avenue, Harrow, HA3 0AB24, Northwick Avenue, Harrow, HA3 0AB
• Sold Jan 2016£685,000 | 4 Bed House27, Hawthorne Avenue, Harrow, HA3 8AG27, Hawthorne Avenue, Harrow, HA3 8AG
• Sold Aug 2015£625,000 | 4 Bed House23, Rushout Avenue, Harrow, HA3 0AS23, Rushout Avenue, Harrow, HA3 0AS
• Sold Sep 2013£456,000 | 5 Bed House8, Northwick Avenue, Harrow, HA3 0AB8, Northwick Avenue, Harrow, HA3 0AB
• Sold Feb 2011£420,000 | 4 Bed House44, Northwick Avenue, Harrow, HA3 0AB44, Northwick Avenue, Harrow, HA3 0AB

Our analysis of the public data ranks 23, Northwick Avenue, Harrow as the 34th largest and the 26th most expensive of the 162 addresses on Northwick Avenue, Harrow, HA3.

Against the HA3 postcode district average, it is £244k more expensive than the typical property.

• Saint Jerome Church of England Bilingual School

  1.1 km away
• Elmgrove Primary School & Nursery

  1.1 km away
• Mount Stewart Infant School

  1.3 km away

• Harrow High School

  500 m away
• St Gregory's Catholic Science College

  1.2 km away
• Claremont High School

  1.9 km away

• Northwick Park

  |

  100 m away
• Kenton

  |

  300 m away
• Harrow-on-the-Hill

  |

  1.1 km away

Environment Agency data suggests this area has a Very Low risk of flooding.