21, St. Leonards Avenue, Harrow occupies a 714 m² plot as recorded by HM Land Registry.

Of the 13 other houses in this postcode, 11 have recorded plot sizes, and this one ranks as the 3rd largest.

21, St. Leonards Avenue, Harrow has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 18 Mar 2010.

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

21, St. Leonards Avenue, Harrow last changed hands on 14th December 2009, selling for £340,000. The transaction was logged as a freehold house by HM Land Registry.

That is its only recorded sale since 1995.

The market for similar properties has risen by 70.3% since December 2009.

• Sold Dec 2009£340,000

Land Registry records and our Estate Agent network show 182 sales of comparable properties within 550 metres of 21, St. Leonards Avenue, Harrow since 2014.

Most recently, 28, Brampton Grove, Harrow, HA3 8LG, a freehold house, sold at £600,000 on the 13th February 2026.

Read more about house prices in HA3.

• Sold Feb 2026£600,000 | 4 Bed House28, Brampton Grove, Harrow, HA3 8LG28, Brampton Grove, Harrow, HA3 8LG
• Sold Feb 2026£605,000 | 4 Bed House39, Brampton Grove, Harrow, HA3 8LD39, Brampton Grove, Harrow, HA3 8LD
• Sold Jan 2026£603,000 | 4 Bed House10, Brampton Grove, Harrow, HA3 8LG10, Brampton Grove, Harrow, HA3 8LG
• Sold Dec 2025£650,000 | 3 Bed House64, Alicia Gardens, Harrow, HA3 8JE64, Alicia Gardens, Harrow, HA3 8JE
• Sold Oct 2025£685,000 | 3 Bed House82, Alicia Gardens, Harrow, HA3 8JE82, Alicia Gardens, Harrow, HA3 8JE
• Sold Jul 2025£675,000 | 4 Bed House33, Alicia Gardens, Harrow, HA3 8JB33, Alicia Gardens, Harrow, HA3 8JB
• Sold Mar 2025£625,000 | 3 Bed House23, Alicia Gardens, Harrow, HA3 8JB23, Alicia Gardens, Harrow, HA3 8JB
• Sold Oct 2024£585,000 | 4 Bed House15, Alicia Close, Harrow, HA3 8HP15, Alicia Close, Harrow, HA3 8HP
• Sold May 2024£630,000 | 4 Bed House1B, Brampton Grove, Harrow, HA3 8LD1B, Brampton Grove, Harrow, HA3 8LD
• Sold Feb 2024£690,000 | 4 Bed House20, Kenton Gardens, Harrow, HA3 8DE20, Kenton Gardens, Harrow, HA3 8DE
• Sold Mar 2023£545,000 | 4 Bed House46, Alicia Avenue, Harrow, HA3 8HS46, Alicia Avenue, Harrow, HA3 8HS
• Sold Sep 2022£660,000 | 4 Bed House18, Kenton Gardens, Harrow, HA3 8DE18, Kenton Gardens, Harrow, HA3 8DE
• Sold Nov 2021£625,000 | 4 Bed House41, Alicia Gardens, Harrow, HA3 8JB41, Alicia Gardens, Harrow, HA3 8JB
• Sold Sep 2021£650,000 | 4 Bed House41, Kenton Gardens, Harrow, HA3 8DE41, Kenton Gardens, Harrow, HA3 8DE
• Sold Jan 2021£657,000 | 3 Bed House7, Sedgecombe Avenue, Harrow, HA3 0HW7, Sedgecombe Avenue, Harrow, HA3 0HW
• Sold Sep 2019£500,000 | 3 Bed House19, Alicia Close, Harrow, HA3 8HP19, Alicia Close, Harrow, HA3 8HP
• Sold Sep 2018£555,000 | 4 Bed House9, Alicia Gardens, Harrow, HA3 8JB9, Alicia Gardens, Harrow, HA3 8JB
• Sold Mar 2017£780,000 | 4 Bed House34, Kenton Gardens, Harrow, HA3 8DE34, Kenton Gardens, Harrow, HA3 8DE
• Sold Nov 2016£582,500 | 4 Bed House41, Becmead Avenue, Harrow, HA3 8HD41, Becmead Avenue, Harrow, HA3 8HD
• Sold May 2014£407,500 | 4 Bed House43, Becmead Avenue, Harrow, HA3 8HD43, Becmead Avenue, Harrow, HA3 8HD

Our analysis of the public data ranks 21, St. Leonards Avenue, Harrow as the 14th largest and the 11th most expensive of the 19 addresses on St. Leonards Avenue, Harrow, HA3.

Against the HA3 postcode district average, it is £111k more expensive than the typical property.

• Elmgrove Primary School & Nursery

  800 m away
• Uxendon Manor Primary School

  1.0 km away
• Priestmead Primary School and Nursery

  1.0 km away

• St Gregory's Catholic Science College

  600 m away
• Claremont High School

  1.2 km away
• Harrow High School

  1.3 km away

• Kenton

  |

  700 m away
• Northwick Park

  |

  1.0 km away
• Harrow & Wealdstone

  |

  1.7 km away

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