21A, Douglas Road, Harpenden occupies a 543 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 3rd largest.

21A, Douglas Road, Harpenden has an Energy Performance Rating (EPC) of E. This is based on the most recent assessment, dated 20 Sep 2018.

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

21A, Douglas Road, Harpenden last changed hands on 6th September 2004, selling for £600,000. The transaction was logged as a freehold house by HM Land Registry.

That is its only recorded sale since 1995.

Land Registry records and our Estate Agent network show 65 sales of comparable properties within 670 metres of 21A, 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 Aug 2023£1,150,000 | 4 Bed House3, Hillside Road, Harpenden, AL5 4BS3, Hillside Road, Harpenden, AL5 4BS
• 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 Dec 2021£1,204,000 | 4 Bed House2, Lambourn Gardens, Harpenden, AL5 4DQ2, Lambourn Gardens, Harpenden, AL5 4DQ
• Sold Sep 2021£1,200,000 | 4 Bed House45, Luton Road, Harpenden, AL5 2UB45, Luton Road, Harpenden, AL5 2UB
• Sold Jun 2021£1,150,000 | 4 Bed House21, Douglas Road, Harpenden, AL5 2EP21, Douglas Road, Harpenden, AL5 2EP
• Sold Dec 2020£868,000 | 4 Bed House17B, Douglas Road, Harpenden, AL5 2EN17B, Douglas Road, Harpenden, AL5 2EN
• 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 Apr 2019£1,090,100 | 4 Bed House9, Alders End Lane, Harpenden, AL5 2HL9, Alders End Lane, Harpenden, AL5 2HL
• Sold Jan 2018£1,080,000 | 4 Bed House11, Alders End Lane, Harpenden, AL5 2HL11, Alders End Lane, Harpenden, AL5 2HL
• Sold Jan 2016£1,025,000 | 4 Bed House29, Claygate Avenue, Harpenden, AL5 2HE29, Claygate Avenue, Harpenden, AL5 2HE
• Sold Nov 2015£925,000 | 4 Bed House37, Claygate Avenue, Harpenden, AL5 2HE37, 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 21A, Douglas Road, Harpenden as the 36th largest and the 30th most expensive of the 66 addresses on Douglas Road, Harpenden, AL5.

Against the AL5 postcode district average, it is £246k 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.