18, Douglas Road, Harpenden occupies a 480 m² plot as recorded by HM Land Registry.

All 13 other houses in this postcode have recorded plot sizes, and this one ranks as the 12th largest.

18, Douglas Road, Harpenden has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 18 Apr 2026.

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

18, Douglas Road, Harpenden last changed hands on 1st March 1996, selling for £206,000. The transaction was logged as a freehold house by HM Land Registry.

That is its only recorded sale since 1995.

• Sold Mar 1996£206,000

Land Registry records and our Estate Agent network show 115 sales of comparable properties within 660 metres of 18, Douglas Road, Harpenden since 2012.

Most recently, 10, Wordsworth Road, Harpenden, AL5 4AF, a freehold house, sold at £1,650,000 on the 12th December 2025.

Read more about house prices in AL5.

• Sold Dec 2025£1,650,000 | 5 Bed House10, Wordsworth Road, Harpenden, AL5 4AF10, Wordsworth Road, Harpenden, AL5 4AF
• Sold Sep 2025£1,610,000 | 4 Bed House4, Townsend Lane, Harpenden, AL5 2QE4, Townsend Lane, Harpenden, AL5 2QE
• Sold Jul 2025£1,305,000 | 4 Bed House12, Bloomfield Road, Harpenden, AL5 4DB12, Bloomfield Road, Harpenden, AL5 4DB
• Sold Jul 2025£1,595,000 | 4 Bed House14, Roundwood Park, Harpenden, AL5 3AB14, Roundwood Park, Harpenden, AL5 3AB
• Sold Apr 2025£1,370,000 | 5 Bed House43A, Moreton End Lane, Harpenden, AL5 2HA43A, Moreton End Lane, Harpenden, AL5 2HA
• Sold Mar 2025£1,615,000 | 5 Bed House45A, Moreton End Lane, Harpenden, AL5 2HA45A, Moreton End Lane, Harpenden, AL5 2HA
• Sold Nov 2024£1,300,000 | 4 Bed House12A, Bloomfield Road, Harpenden, AL5 4DB12A, Bloomfield Road, Harpenden, AL5 4DB
• Sold Aug 2024£1,685,000 | 5 Bed House24C, Douglas Road, Harpenden, AL5 2EW24C, Douglas Road, Harpenden, AL5 2EW
• Sold May 2024£1,260,000 | 4 Bed House6, Barns Dene, Harpenden, AL5 2HQ6, Barns Dene, Harpenden, AL5 2HQ
• Sold Nov 2023£1,700,000 | 5 Bed House44, Townsend Lane, Harpenden, AL5 2QS44, Townsend Lane, Harpenden, AL5 2QS
• Sold Nov 2023£1,450,000 | 5 Bed House3, Barns Dene, Harpenden, AL5 2HH3, Barns Dene, Harpenden, AL5 2HH
• Sold Aug 2023£1,325,000 | 5 Bed House45, Moreton End Lane, Harpenden, AL5 2HA45, Moreton End Lane, Harpenden, AL5 2HA
• Sold Jul 2023£1,325,000 | 5 Bed House4, Townsend Road, Harpenden, AL5 4BQ4, Townsend Road, Harpenden, AL5 4BQ
• Sold Jun 2023£1,600,000 | 5 Bed House5, Douglas Road, Harpenden, AL5 2EN5, Douglas Road, Harpenden, AL5 2EN
• Sold Mar 2023£1,507,500 | 4 Bed House21, Moreton End Lane, Harpenden, AL5 2EY21, Moreton End Lane, Harpenden, AL5 2EY
• Sold Feb 2023£1,355,000 | 5 Bed House1, Hillside Road, Harpenden, AL5 4BS1, Hillside Road, Harpenden, AL5 4BS
• Sold Jun 2021£1,200,000 | 5 Bed House2B, Clarence Road, Harpenden, AL5 4AJ2B, Clarence Road, Harpenden, AL5 4AJ
• Sold Sep 2016£1,110,000 | 5 Bed House27, Moreton End Lane, Harpenden, AL5 2EY27, Moreton End Lane, Harpenden, AL5 2EY
• Sold Jun 2013£1,115,000 | 5 Bed House9, Moreton End Lane, Harpenden, AL5 2EY9, Moreton End Lane, Harpenden, AL5 2EY
• Sold Oct 2012£980,000 | 4 Bed House11, Douglas Road, Harpenden, AL5 2EN11, Douglas Road, Harpenden, AL5 2EN

Our analysis of the public data ranks 18, Douglas Road, Harpenden as the 21st largest and the 21st most expensive of the 66 addresses on Douglas Road, Harpenden, AL5.

Against the AL5 postcode district average, it is £581k more expensive than the typical property.

• St Nicholas CofE VA Primary School

  600 m away
• Roundwood Primary School

  600 m away
• Harpenden Academy

  900 m away

• Roundwood Park School

  700 m away
• St George's School

  700 m away
• Sir John Lawes School

  1.2 km away

• Harpenden

  |

  1.0 km away
• Luton Airport Parkway

  |

  6.2 km away
• Luton

  |

  7.6 km away

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