4, Blackwell Close, Harrow occupies a 137 m² plot as recorded by HM Land Registry.

All 9 other houses in this postcode have recorded plot sizes, and this one ranks as the 2nd largest.

4, Blackwell Close, Harrow has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 12 Dec 2017.

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

4, Blackwell Close, Harrow last changed hands on 22nd August 2019, selling for £415,000. 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 16.1% since August 2019.

• Sold Aug 2019£415,000

Land Registry records and our Estate Agent network show 116 sales of comparable properties within 510 metres of 4, Blackwell Close, Harrow since 2013.

Most recently, 10, Hutton Gardens, Harrow, HA3 6RA, a freehold house, sold at £438,000 on the 19th December 2025.

Read more about house prices in HA3.

• Sold Dec 2025£438,000 | 3 Bed House10, Hutton Gardens, Harrow, HA3 6RA10, Hutton Gardens, Harrow, HA3 6RA
• Sold Nov 2025£500,000 | 3 Bed House40, Belsize Road, Harrow, HA3 6JJ40, Belsize Road, Harrow, HA3 6JJ
• Sold Oct 2025£555,000 | 3 Bed House27, Belsize Road, Harrow, HA3 6JL27, Belsize Road, Harrow, HA3 6JL
• Sold May 2025£495,000 | 3 Bed House8, Elm Terrace, Harrow, HA3 6HW8, Elm Terrace, Harrow, HA3 6HW
• Sold Apr 2025£600,000 | 3 Bed House1, Stox Mead, Harrow, HA3 5JX1, Stox Mead, Harrow, HA3 5JX
• Sold Nov 2024£495,000 | 3 Bed House41, Boxtree Lane, Harrow, HA3 6JP41, Boxtree Lane, Harrow, HA3 6JP
• Sold Sep 2024£480,000 | 3 Bed House84, Boxtree Lane, Harrow, HA3 6JB84, Boxtree Lane, Harrow, HA3 6JB
• Sold Aug 2024£510,000 | 3 Bed House17, Elm Terrace, Harrow, HA3 6HW17, Elm Terrace, Harrow, HA3 6HW
• Sold Mar 2024£550,000 | 3 Bed House42, Boxtree Road, Harrow, HA3 6TH42, Boxtree Road, Harrow, HA3 6TH
• Sold Feb 2024£445,000 | 3 Bed House67, Hutton Lane, Harrow, HA3 6QT67, Hutton Lane, Harrow, HA3 6QT
• Sold Jan 2024£477,000 | 3 Bed House2, Blackwell Close, Harrow, HA3 6JY2, Blackwell Close, Harrow, HA3 6JY
• Sold Oct 2023£405,000 | 3 Bed House22, Mepham Crescent, Harrow, HA3 6QX22, Mepham Crescent, Harrow, HA3 6QX
• Sold Mar 2022£515,000 | 3 Bed House71, Sefton Avenue, Harrow, HA3 5JP71, Sefton Avenue, Harrow, HA3 5JP
• Sold Dec 2021£425,000 | 3 Bed House6, Hutton Lane, Harrow, HA3 6RD6, Hutton Lane, Harrow, HA3 6RD
• Sold Apr 2021£430,000 | 4 Bed House3, Blackwell Close, Harrow, HA3 6JY3, Blackwell Close, Harrow, HA3 6JY
• Sold Dec 2020£533,141 | 3 Bed House70, Hutton Lane, Harrow, HA3 6RD70, Hutton Lane, Harrow, HA3 6RD
• Sold Dec 2019£520,000 | 3 Bed House2, Colmer Place, Harrow, HA3 6JW2, Colmer Place, Harrow, HA3 6JW
• Sold Oct 2019£425,000 | 3 Bed House29, Boxtree Lane, Harrow, HA3 6JP29, Boxtree Lane, Harrow, HA3 6JP
• Sold Aug 2015£314,000 | 3 Bed House14, Hutton Lane, Harrow, HA3 6RD14, Hutton Lane, Harrow, HA3 6RD
• Sold Jul 2013£339,950 | 3 Bed House14, Colmer Place, Harrow, HA3 6JW14, Colmer Place, Harrow, HA3 6JW

Our analysis of the public data ranks 4, Blackwell Close, Harrow as the 9th largest and the 9th most expensive of the 40 addresses on Blackwell Close, Harrow, HA3.

Against the HA3 postcode district average, it is £40k less expensive than the typical property.

• Cedars Manor School

  500 m away
• St Teresa's Catholic Primary School and Nursery

  800 m away
• Hujjat Primary School

  800 m away

• Hatch End High School

  800 m away
• Salvatorian Roman Catholic College

  800 m away
• The Sacred Heart Language College

  1.0 km away

• Headstone Lane

  |

  1.0 km away
• Hatch End

  |

  1.7 km away
• Harrow & Wealdstone

  |

  1.8 km away

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