HM Land Registry records the plot of land for 18, Grasmere Avenue, Harpenden as measuring 748 m².

That makes it the 10th largest plot in the postcode, where 13 of the 15 other houses have recorded plot data.

18, Grasmere Avenue, Harpenden has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 18 Jan 2011.

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

The most recent sale of 18, Grasmere Avenue, Harpenden completed on 18th September 2012 at £1,200,000 and was recorded by HM Land Registry as a freehold house.

Since 1995 the property has sold twice.

Values of comparable properties have risen by 34.4% over the period since September 2012.

Since 2011 47 properties similar to 18, Grasmere Avenue, Harpenden have sold within a radius of 590 metres, per the Land Registry and our network of Estate Agents.

The latest, on the 7th May 2026, was 4, Lyndhurst Drive, Harpenden, AL5 5QN, a freehold house which sold for £2,070,000.

Read more about house prices in AL5.

• Sold May 2026£2,070,000 | 4 Bed House4, Lyndhurst Drive, Harpenden, AL5 5QN4, Lyndhurst Drive, Harpenden, AL5 5QN
• Sold Dec 2025£1,675,000 | 5 Bed House8, Spenser Road, Harpenden, AL5 5NN8, Spenser Road, Harpenden, AL5 5NN
• Sold Aug 2025£1,575,000 | 5 Bed House1A, Cowper Road, Harpenden, AL5 5NF1A, Cowper Road, Harpenden, AL5 5NF
• Sold Jun 2025£1,760,000 | 5 Bed House83, Overstone Road, Harpenden, AL5 5PL83, Overstone Road, Harpenden, AL5 5PL
• Sold Feb 2025£1,465,000 | 5 Bed House4, Spenser Road, Harpenden, AL5 5NN4, Spenser Road, Harpenden, AL5 5NN
• Sold Feb 2025£1,550,000 | 5 Bed House18, Spenser Road, Harpenden, AL5 5NN18, Spenser Road, Harpenden, AL5 5NN
• Sold Aug 2024£1,570,000 | 5 Bed House60, Dalkeith Road, Harpenden, AL5 5PW60, Dalkeith Road, Harpenden, AL5 5PW
• Sold Jun 2023£1,800,000 | 5 Bed House12, Sauncey Avenue, Harpenden, AL5 4QF12, Sauncey Avenue, Harpenden, AL5 4QF
• Sold Feb 2023£1,700,000 | 5 Bed House12, Gilpin Green, Harpenden, AL5 5NR12, Gilpin Green, Harpenden, AL5 5NR
• Sold Oct 2022£1,450,000 | 5 Bed House109, Overstone Road, Harpenden, AL5 5PL109, Overstone Road, Harpenden, AL5 5PL
• Sold Nov 2021£1,510,000 | 5 Bed House19, Dalkeith Road, Harpenden, AL5 5PP19, Dalkeith Road, Harpenden, AL5 5PP
• Sold Jun 2021£1,722,000 | 5 Bed House16, Grasmere Avenue, Harpenden, AL5 5PS16, Grasmere Avenue, Harpenden, AL5 5PS
• Sold Oct 2020£1,410,000 | 5 Bed House50, Dalkeith Road, Harpenden, AL5 5PW50, Dalkeith Road, Harpenden, AL5 5PW
• Sold Oct 2020£1,750,000 | 5 Bed House16, Lyndhurst Drive, Harpenden, AL5 5QN16, Lyndhurst Drive, Harpenden, AL5 5QN
• Sold Mar 2020£1,165,000 | 5 Bed House8, Granby Avenue, Harpenden, AL5 5QR8, Granby Avenue, Harpenden, AL5 5QR
• Sold Feb 2018£1,355,000 | 5 Bed House19, Grasmere Avenue, Harpenden, AL5 5PT19, Grasmere Avenue, Harpenden, AL5 5PT
• Sold Mar 2016£1,250,000 | 5 Bed House19, Lyndhurst Drive, Harpenden, AL5 5QW19, Lyndhurst Drive, Harpenden, AL5 5QW
• Sold Apr 2015£1,250,000 | 5 Bed House24, Lyndhurst Drive, Harpenden, AL5 5RJ24, Lyndhurst Drive, Harpenden, AL5 5RJ
• Sold May 2013£1,160,000 | 5 Bed House33, Dalkeith Road, Harpenden, AL5 5PP33, Dalkeith Road, Harpenden, AL5 5PP
• Sold Aug 2011£1,060,000 | 5 Bed House24, Dalkeith Road, Harpenden, AL5 5PW24, Dalkeith Road, Harpenden, AL5 5PW

Of the 29 addresses on Grasmere Avenue, Harpenden, AL5, 18, Grasmere Avenue, Harpenden comes out as the 19th largest and the 18th most expensive in our analysis of the public data.

It is also £748k more expensive than the average property across the AL5 district.

• Crabtree Junior School

  200 m away
• Crabtree Infants' School

  200 m away
• High Beeches Primary School

  600 m away

• Sir John Lawes School

  700 m away
• Katherine Warington School

  900 m away
• St George's School

  1.0 km away

• Harpenden

  |

  700 m away
• Luton Airport Parkway

  |

  7.2 km away
• St Albans City

  |

  7.5 km away

The flood risk here is rated Very Low, based on Environment Agency data.