21, Castle Avenue, Slough occupies a 578 m² plot as recorded by HM Land Registry.

Of the 22 other houses in this postcode, 21 have recorded plot sizes, and this one ranks as the 11th largest.

21, Castle Avenue, Slough has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 20 Apr 2022.

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

21, Castle Avenue, Slough last changed hands on 23rd May 2022, selling for £1,085,000. The transaction was logged as a freehold house by HM Land Registry.

In total it has sold twice since 1995.

The market for similar properties has dropped by 19.7% since May 2022.

• Sold May 2022£1,085,000
• Sold Nov 2017£480,000

Land Registry records and our Estate Agent network show 40 sales of comparable properties within 1.4 kilometres of 21, Castle Avenue, Slough since 2013.

Most recently, 40, London Road, Slough, SL3 9JN, a freehold house, sold at £970,000 on the 22nd October 2025.

Read more about house prices in SL3.

• Sold Oct 2025£970,000 | 5 Bed House40, London Road, Slough, SL3 9JN40, London Road, Slough, SL3 9JN
• Sold Jan 2025£1,150,000 | 5 Bed House33, Montagu Road, Slough, SL3 9DT33, Montagu Road, Slough, SL3 9DT
• Sold Jan 2025£895,000 | 5 Bed House27, Castleview Road, Slough, SL3 7NH27, Castleview Road, Slough, SL3 7NH
• Sold May 2024£920,000 | 5 Bed House44, Buckland Avenue, Slough, SL3 7PH44, Buckland Avenue, Slough, SL3 7PH
• Sold Feb 2024£1,087,500 | 5 Bed House55, London Road, Slough, SL3 9JY55, London Road, Slough, SL3 9JY
• Sold Sep 2023£850,000 | 5 Bed House72, Buckland Avenue, Slough, SL3 7PH72, Buckland Avenue, Slough, SL3 7PH
• Sold Jul 2023£890,000 | 5 Bed House46, Buckland Avenue, Slough, SL3 7PH46, Buckland Avenue, Slough, SL3 7PH
• Sold Dec 2022£1,025,000 | 5 Bed House23A, Montagu Road, Slough, SL3 9DT23A, Montagu Road, Slough, SL3 9DT
• Sold May 2022£740,000 | 5 Bed House101A, Upton Road, Slough, SL1 2AE101A, Upton Road, Slough, SL1 2AE
• Sold Apr 2022£1,055,000 | 5 Bed HouseDatchet Court, Windsor Road, Slough, SL3 9BRDatchet Court, Windsor Road, Slough, SL3 9BR
• Sold Jun 2021£865,500 | 5 Bed House69, Slough Road, Slough, SL3 9AL69, Slough Road, Slough, SL3 9AL
• Sold Sep 2020£695,000 | 5 Bed House12, Lawn Close, Slough, SL3 9JZ12, Lawn Close, Slough, SL3 9JZ
• Sold Oct 2019£810,000 | 5 Bed House131, Slough Road, Slough, SL3 9AE131, Slough Road, Slough, SL3 9AE
• Sold Nov 2018£760,000 | 5 Bed House29, Montagu Road, Slough, SL3 9DT29, Montagu Road, Slough, SL3 9DT
• Sold Jan 2018£575,000 | 5 Bed HousePriory End, The Green, Slough, SL3 9JLPriory End, The Green, Slough, SL3 9JL
• Sold Jul 2017£845,000 | 5 Bed HouseSwallows Flight, Deep Field, Slough, SL3 9JSSwallows Flight, Deep Field, Slough, SL3 9JS
• Sold Jul 2016£875,000 | 5 Bed HouseField End, Deep Field, Slough, SL3 9JSField End, Deep Field, Slough, SL3 9JS
• Sold Nov 2015£925,000 | 5 Bed House91, Slough Road, Slough, SL3 9AL91, Slough Road, Slough, SL3 9AL
• Sold Jul 2014£705,000 | 5 Bed House101A, Slough Road, Slough, SL3 9AQ101A, Slough Road, Slough, SL3 9AQ
• Sold Oct 2013£850,000 | 5 Bed House28, Eton Road, Slough, SL3 9AY28, Eton Road, Slough, SL3 9AY

Our analysis of the public data ranks 21, Castle Avenue, Slough as the largest and the most expensive of the 22 addresses on Castle Avenue, Datchet, Slough, SL3.

Against the SL3 postcode district average, it is £413k more expensive than the typical property.

• Datchet St Mary's CofE Primary School

  1.1 km away
• St Mary's Church of England Primary School

  1.5 km away
• Castleview Primary School

  1.6 km away

• Churchmead Church of England (VA) School

  800 m away
• Ditton Park Academy

  1.1 km away
• Upton Court Grammar School

  1.5 km away

• Datchet

  |

  1.1 km away
• Windsor & Eton Riverside

  |

  1.6 km away
• Windsor & Eton Central

  |

  2.0 km away

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