21, Barns Dene, Harpenden occupies a 949 m² plot as recorded by HM Land Registry.

All 20 other houses in this postcode have recorded plot sizes, and this one ranks as the largest.

21, Barns Dene, Harpenden has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 26 Apr 2016.

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

21, Barns Dene, Harpenden last changed hands on 17th August 2016, selling for £1,375,000. 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 dropped by 15.1% since August 2016.

• Sold Aug 2016£1,375,000

Land Registry records and our Estate Agent network show 85 sales of comparable properties within 910 metres of 21, Barns Dene, Harpenden since 2007.

Most recently, 22, Hartwell Gardens, Harpenden, AL5 2RW, a freehold house, sold at £1,750,000 on the 26th November 2025.

Read more about house prices in AL5.

• Sold Nov 2025£1,750,000 | 5 Bed House22, Hartwell Gardens, Harpenden, AL5 2RW22, Hartwell Gardens, Harpenden, AL5 2RW
• Sold Jan 2025£1,250,000 | 5 Bed House65, Townsend Lane, Harpenden, AL5 2RE65, Townsend Lane, Harpenden, AL5 2RE
• Sold Oct 2024£1,560,000 | 5 Bed House3, Pondwick Road, Harpenden, AL5 2HG3, Pondwick Road, Harpenden, AL5 2HG
• Sold Sep 2024£1,470,000 | 5 Bed House19, Claygate Avenue, Harpenden, AL5 2HE19, Claygate Avenue, Harpenden, AL5 2HE
• Sold Sep 2024£1,835,000 | 5 Bed House8, Hartwell Gardens, Harpenden, AL5 2RW8, Hartwell Gardens, Harpenden, AL5 2RW
• Sold Feb 2024£1,810,001 | 5 Bed House22, Barns Dene, Harpenden, AL5 2HQ22, Barns Dene, Harpenden, AL5 2HQ
• Sold Nov 2023£1,450,000 | 5 Bed House3, Barns Dene, Harpenden, AL5 2HH3, Barns Dene, Harpenden, AL5 2HH
• Sold Jul 2022£1,425,000 | 5 Bed House27, Claygate Avenue, Harpenden, AL5 2HE27, Claygate Avenue, Harpenden, AL5 2HE
• Sold Jun 2022£1,900,000 | 5 Bed House31, Claygate Avenue, Harpenden, AL5 2HE31, Claygate Avenue, Harpenden, AL5 2HE
• Sold Oct 2021£1,490,000 | 5 Bed House12, Barns Dene, Harpenden, AL5 2HQ12, Barns Dene, Harpenden, AL5 2HQ
• Sold Jun 2021£1,525,000 | 5 Bed House29, Barns Dene, Harpenden, AL5 2HH29, Barns Dene, Harpenden, AL5 2HH
• Sold Jan 2021£1,700,000 | 5 Bed House92, Townsend Lane, Harpenden, AL5 2RQ92, Townsend Lane, Harpenden, AL5 2RQ
• Sold Aug 2020£1,089,000 | 5 Bed House12, Broadfields, Harpenden, AL5 2HJ12, Broadfields, Harpenden, AL5 2HJ
• Sold Sep 2017£1,300,000 | 5 Bed House14, Hartwell Gardens, Harpenden, AL5 2RW14, Hartwell Gardens, Harpenden, AL5 2RW
• Sold Sep 2017£1,190,700 | 5 Bed House4, Barns Dene, Harpenden, AL5 2HQ4, Barns Dene, Harpenden, AL5 2HQ
• Sold May 2015£1,320,000 | 5 Bed House19, Broadfields, Harpenden, AL5 2HJ19, Broadfields, Harpenden, AL5 2HJ
• Sold Dec 2014£1,365,000 | 5 Bed House39, Barns Dene, Harpenden, AL5 2HH39, Barns Dene, Harpenden, AL5 2HH
• Sold Oct 2012£985,000 | 5 Bed House33, Barns Dene, Harpenden, AL5 2HH33, Barns Dene, Harpenden, AL5 2HH
• Sold Aug 2007£962,500 | 5 Bed House4, Claygate Avenue, Harpenden, AL5 2HF4, Claygate Avenue, Harpenden, AL5 2HF
• Sold Aug 2007£900,000 | 5 Bed House18, Barns Dene, Harpenden, AL5 2HQ18, Barns Dene, Harpenden, AL5 2HQ

Our analysis of the public data ranks 21, Barns Dene, Harpenden as the 7th largest and the 8th most expensive of the 37 addresses on Barns Dene, Harpenden, AL5.

Against the AL5 postcode district average, it is £755k more expensive than the typical property.

• Roundwood Primary School

  300 m away
• St Nicholas CofE VA Primary School

  800 m away
• Harpenden Academy

  1.1 km away

• Roundwood Park School

  300 m away
• St George's School

  1.2 km away
• Sir John Lawes School

  1.7 km away

• Harpenden

  |

  1.2 km away
• Luton Airport Parkway

  |

  6.4 km away
• Luton

  |

  7.8 km away

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