10, DEVONSHIRE ROAD, HARPENDEN, AL5 4TJ - £1,694,500

The information on this page is based on a number of underlying datasets, most of which are updated monthly. We maintain an update schedule which explains which version of each dataset we are currently relying on.

10 DEVONSHIRE ROAD is a very large extended detached house of 295m², built sometime between 1900 and 1929, which could now be worth an estimated £2,052,091. It was last sold for £1,694,500 in July 2019, which was around 68% above the average July 2019 detached price in the St Albans local authority area. The most recent EPC inspection was November 2025, where the current energy rating was D, and the potential energy rating was D.

10 DEVONSHIRE ROAD Sold Prices

Land registry data shows two sales for 10 DEVONSHIRE ROAD since 1^st January 1995. The below table shows the price paid for the two sales, along with the average detached price in the St Albans local authority area for the corresponding sale date. Both of the two 10 DEVONSHIRE ROAD sales were for above the average price. The average price is sourced from the Office for National Statistics' House Price Index (HPI).

Date	Price	HPI Price	Variation from HPI
2019 30 JUL	£1,694,500	£1,010,660	68% above HPI
2010 14 JAN	£1,275,562	£629,658	103% above HPI

10 DEVONSHIRE ROAD Price Paid vs. HPI Average

The below graph shows the average detached house price in the St Albans local authority area over time, sourced from the HPI. The two 10 DEVONSHIRE ROAD sales from January 2010 and July 2019 have been plotted on the graph. A line has been extrapolated to show what the value of the property might have been over time, following each sale, had it maintained the same margin above or below the HPI (as a percentage). For example, the January 2010 sale was for 103% above the HPI. So the extrapolation line tracks at 103% above the HPI over time, until the July 2019 sale, where it falls to 68% above the HPI. The line then continues to track at 68% above the HPI.

What might 10 DEVONSHIRE ROAD be worth now?

10 DEVONSHIRE ROAD might now be worth an estimated £2,052,091.

This is based on house price inflation of 21.1%, between July 2019 and May 2026, for detached houses, in the St Albans local authority area, as calculated by the Office for National Statistics and published in their UK House Price Index (HPI).

The 21.1% inflationary increase is applied to the most recent sale price for 10 DEVONSHIRE ROAD of £1,694,500 on 30th July 2019. For the value to have increased from £1,694,500 to £2,052,091 over the seven years and two months to May 2026, the following assumptions must hold true:

• The value of 10 DEVONSHIRE ROAD has moved in line with the HPI for detached houses in the St Albans local authority area.
• The July 2019 sale price of £1,694,500 represented a fair market value for the property.
• The size, condition, and specification of 10 DEVONSHIRE ROAD has not materially changed since July 2019.

How Large is 10 DEVONSHIRE ROAD?

10 DEVONSHIRE ROAD is 295m², which includes four extensions, according to the EPC inspection conducted in November 2025. This puts it in the largest 20% of detached houses houses in Harpenden, based on EPC data. The below chart shows the distribution of detached houses houses by size in Harpenden, and where 10 DEVONSHIRE ROAD lies on this distribution: 87% of detached houses houses are smaller than 10 DEVONSHIRE ROAD, and 13% of houses are larger. Note that EPC data is not available for all properties in Harpenden.

10 DEVONSHIRE ROAD: Plot and Title Map

10 DEVONSHIRE ROAD sits on a plot of roughly 0.203 of an acre, or 822m². The below map shows the location of 10 DEVONSHIRE ROAD, an approximate outline of the building(s), and the indicative extent of the property. The plot extent is a Land Registry INSPIRE Index Polygon, and it is important to note that a title may include more than one polygon, whereas only one polygon is shown on the map (the polygon which intersects with the position of 10 DEVONSHIRE ROAD). The full extent of the land contained in any registered title can only be identified from the individual title plan. The maps on this page should not be relied upon to establish the extent of a title.

Where is 10 DEVONSHIRE ROAD?

10 DEVONSHIRE ROAD is located in HARPENDEN, in the AL5 postcode district. The below map shows the position of No. 10 on DEVONSHIRE ROAD.