21, Douglas Road, Harpenden occupies a 583 m² plot as recorded by HM Land Registry.

All 4 other houses in this postcode have recorded plot sizes, and this one ranks as the largest.

21, Douglas Road, Harpenden has an Energy Performance Rating (EPC) of E. This is based on the most recent assessment, dated 10 Jul 2017.

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

21, Douglas Road, Harpenden last changed hands on 28th June 2021, selling for £1,150,000. 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 6.9% since June 2021.

• Sold Jun 2021£1,150,000
• Sold Dec 2005£550,000

Land Registry records and our Estate Agent network show 93 sales of comparable properties within 670 metres of 21, Douglas Road, Harpenden since 2011.

Most recently, 25, Moreton End Lane, Harpenden, AL5 2EY, a freehold house, sold at £1,160,000 on the 27th April 2026.

Read more about house prices in AL5.

• Sold Apr 2026£1,160,000 | 4 Bed House25, Moreton End Lane, Harpenden, AL5 2EY25, Moreton End Lane, Harpenden, AL5 2EY
• Sold Dec 2025£1,130,000 | 4 Bed House1, Byron Road, Harpenden, AL5 4AD1, Byron Road, Harpenden, AL5 4AD
• Sold Sep 2025£1,175,000 | 4 Bed House27, Barns Dene, Harpenden, AL5 2HH27, Barns Dene, Harpenden, AL5 2HH
• Sold Jul 2025£1,375,000 | 4 Bed House16, Hitherfield Lane, Harpenden, AL5 4JD16, Hitherfield Lane, Harpenden, AL5 4JD
• Sold Feb 2025£1,325,000 | 4 Bed House3, Townsend Close, Harpenden, AL5 2RF3, Townsend Close, Harpenden, AL5 2RF
• Sold Jan 2025£1,150,000 | 4 Bed House16, Broadfields, Harpenden, AL5 2HJ16, Broadfields, Harpenden, AL5 2HJ
• Sold Jan 2024£1,500,000 | 4 Bed House11B, Douglas Road, Harpenden, AL5 2EN11B, Douglas Road, Harpenden, AL5 2EN
• Sold Aug 2023£1,515,000 | 4 Bed House8, Barns Dene, Harpenden, AL5 2HQ8, Barns Dene, Harpenden, AL5 2HQ
• Sold Jan 2023£1,300,000 | 4 Bed House38, Townsend Lane, Harpenden, AL5 2QS38, Townsend Lane, Harpenden, AL5 2QS
• Sold Oct 2022£1,840,000 | 4 Bed House10, Pondwick Road, Harpenden, AL5 2HG10, Pondwick Road, Harpenden, AL5 2HG
• Sold Jun 2022£1,285,000 | 4 Bed House6, Townsend Lane, Harpenden, AL5 2QE6, Townsend Lane, Harpenden, AL5 2QE
• Sold Sep 2021£1,200,000 | 4 Bed House45, Luton Road, Harpenden, AL5 2UB45, Luton Road, Harpenden, AL5 2UB
• Sold Feb 2021£1,065,000 | 4 Bed House6, Broadfields, Harpenden, AL5 2HJ6, Broadfields, Harpenden, AL5 2HJ
• Sold Dec 2020£868,000 | 4 Bed House17B, Douglas Road, Harpenden, AL5 2EN17B, Douglas Road, Harpenden, AL5 2EN
• Sold Sep 2020£1,100,000 | 4 Bed House6A, Moreton End Lane, Harpenden, AL5 2EX6A, Moreton End Lane, Harpenden, AL5 2EX
• Sold Nov 2019£800,000 | 4 Bed House51, Moreton End Lane, Harpenden, AL5 2HA51, Moreton End Lane, Harpenden, AL5 2HA
• Sold Sep 2019£900,000 | 4 Bed House11, Claygate Avenue, Harpenden, AL5 2HE11, Claygate Avenue, Harpenden, AL5 2HE
• Sold Oct 2018£1,150,000 | 4 Bed House5, Claygate Avenue, Harpenden, AL5 2HE5, Claygate Avenue, Harpenden, AL5 2HE
• Sold Aug 2015£950,000 | 4 Bed House35, Claygate Avenue, Harpenden, AL5 2HE35, Claygate Avenue, Harpenden, AL5 2HE
• Sold Aug 2011£810,502 | 4 Bed House10, Barns Dene, Harpenden, AL5 2HQ10, Barns Dene, Harpenden, AL5 2HQ

Our analysis of the public data ranks 21, Douglas Road, Harpenden as the 28th largest and the 29th most expensive of the 66 addresses on Douglas Road, Harpenden, AL5.

Against the AL5 postcode district average, it is £287k more expensive than the typical property.

• St Nicholas CofE VA Primary School

  500 m away
• Roundwood Primary School

  500 m away
• Harpenden Academy

  800 m away

• Roundwood Park School

  600 m away
• St George's School

  800 m away
• Sir John Lawes School

  1.3 km away

• Harpenden

  |

  1.0 km away
• Luton Airport Parkway

  |

  6.3 km away
• Luton

  |

  7.8 km away

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