According to data from HM Land Registry, 9, Blackwell Close, Harrow sits on a plot of 124 m².

We have plot size data on 9 out of 9 other houses in the postcode and 9, Blackwell Close, Harrow sits on the 8th largest plot.

9, Blackwell Close, Harrow has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 21 Jan 2020.

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

According to HM Land Registry, 9, Blackwell Close, Harrow was last sold on 23rd October 2006 for £268,000 and was recorded as a freehold house.

The property has had 2 sales since 1995.

• Sold Oct 2006£268,000
• Sold Aug 1997£96,000

According to the Land Registry and our network of Estate Agents, there have been 77 sales of properties similar to 9, Blackwell Close, Harrow within a radius of 510 metres since 2007.

The most recent example is 10, Hutton Gardens, Harrow, HA3 6RA, a freehold house which sold for £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 Aug 2025£565,000 | 3 Bed House72, Weighton Road, Harrow, HA3 6HZ72, Weighton Road, Harrow, HA3 6HZ
• Sold Apr 2025£600,000 | 3 Bed House1, Stox Mead, Harrow, HA3 5JX1, Stox Mead, Harrow, HA3 5JX
• 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 Jan 2024£477,000 | 3 Bed House2, Blackwell Close, Harrow, HA3 6JY2, Blackwell Close, Harrow, HA3 6JY
• Sold Oct 2022£550,000 | 3 Bed House9, Belsize Road, Harrow, HA3 6JL9, Belsize Road, Harrow, HA3 6JL
• Sold Oct 2022£600,000 | 3 Bed House66, Weighton Road, Harrow, HA3 6HZ66, Weighton Road, Harrow, HA3 6HZ
• Sold Jul 2022£550,000 | 4 Bed House13, College Road, Harrow, HA3 6EF13, College Road, Harrow, HA3 6EF
• Sold Apr 2022£577,000 | 3 Bed House20, Weighton Road, Harrow, HA3 6HZ20, Weighton Road, Harrow, HA3 6HZ
• Sold Sep 2021£515,000 | 3 Bed House58, Weighton Road, Harrow, HA3 6HZ58, Weighton Road, Harrow, HA3 6HZ
• Sold May 2021£550,000 | 4 Bed House17, Mepham Gardens, Harrow, HA3 6QS17, Mepham Gardens, Harrow, HA3 6QS
• Sold Apr 2021£430,000 | 4 Bed House3, Blackwell Close, Harrow, HA3 6JY3, Blackwell Close, Harrow, HA3 6JY
• Sold Dec 2020£541,000 | 3 Bed House38, Weighton Road, Harrow, HA3 6HZ38, Weighton Road, Harrow, HA3 6HZ
• Sold Jul 2020£430,000 | 3 Bed House3, Baslow Close, Harrow, HA3 5LG3, Baslow Close, Harrow, HA3 5LG
• Sold Aug 2019£415,000 | 3 Bed House4, Blackwell Close, Harrow, HA3 6JY4, Blackwell Close, Harrow, HA3 6JY
• Sold Mar 2018£510,000 | 4 Bed House12, Elm Terrace, Harrow, HA3 6HW12, Elm Terrace, Harrow, HA3 6HW
• Sold Mar 2018£413,000 | 4 Bed House24, Hutton Lane, Harrow, HA3 6RD24, Hutton Lane, Harrow, HA3 6RD
• Sold Aug 2012£335,000 | 3 Bed House1, Colmer Place, Harrow, HA3 6JW1, Colmer Place, Harrow, HA3 6JW
• Sold Jun 2007£305,000 | 4 Bed House5, Blackwell Close, Harrow, HA3 6JY5, Blackwell Close, Harrow, HA3 6JY

Blackwell Close, Harrow, HA3 has a total of 40 addresses. According to our analysis of all the public data, 9, Blackwell Close, Harrow is the 5th largest and the 6th most expensive property on the street.

When compared to the postcode district it is £6k less expensive than the average property in HA3.

• 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

According to data from the Environment Agency, the flood risk in this area is considered to be Very Low.