42, COWPER ROAD, HARPENDEN, AL5 5NG - £988,000

Based on the January 2025 Price Paid Data (released on 3rd March 2025), the December 2024 House Price Index (released on 19th February 2025), and the January 2025 Energy Performance of Buildings Data (released on 27th February 2025). Sources

42 COWPER ROAD is a midsized extended semi-detached house of 181m², built sometime before 1900, which could now be worth an estimated £1,172,441. It was last sold for £988,000 in December 2017, which was around 53% above the average December 2017 semi-detached price in the St Albans local authority area. The most recent EPC inspection was April 2023, where the current energy rating was D, and the potential energy rating was C.

42 COWPER ROAD Sold Prices

Land registry data shows four sales for 42 COWPER ROAD since 1^st January 1995. The below table shows the price paid for the four sales, along with the average semi-detached price in the St Albans local authority area for the corresponding sale date. All of the four 42 COWPER 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
2017 15 DEC	£988,000	£644,994	53% above HPI
2010 29 JUN	£775,000	£404,863	91% above HPI
2008 30 OCT	£575,000	£365,868	57% above HPI
1996 13 SEP	£172,000	£112,593	53% above HPI

42 COWPER ROAD Price Paid vs. HPI Average

The below graph shows the average semi-detached house price in the St Albans local authority area over time, sourced from the HPI. The four 42 COWPER ROAD sales between September 1996 and December 2017 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 June 2010 sale was for 91% above the HPI. So the extrapolation line tracks at 91% above the HPI over time, until the December 2017 sale, where it falls to 53% above the HPI. The line then continues to track at 53% above the HPI.

What might 42 COWPER ROAD be worth now?

42 COWPER ROAD might now be worth an estimated £1,172,441.

This is based on house price inflation of 18.7%, between December 2017 and December 2024, for semi-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 18.7% inflationary increase is applied to the most recent sale price for 42 COWPER ROAD of £988,000 on 15th December 2017. For the value to have increased from £988,000 to £1,172,441 over the seven years to December 2024, the following assumptions must hold true:

• The value of 42 COWPER ROAD has moved in line with the HPI for semi-detached houses in the St Albans local authority area.
• The December 2017 sale price of £988,000 represented a fair market value for the property.
• The size, condition, and specification of 42 COWPER ROAD has not materially changed since December 2017.

How Large is 42 COWPER ROAD?

42 COWPER ROAD is 181m², which includes two extensions, according to the EPC inspection conducted in April 2023. This puts it in the largest 50% of semi-detached houses houses in Harpenden, based on EPC data. The below chart shows the distribution of semi-detached houses houses by size in Harpenden, and where 42 COWPER ROAD lies on this distribution: 58% of semi-detached houses houses are smaller than 42 COWPER ROAD, and 41% of houses are larger. Note that EPC data is not available for all properties in Harpenden.

42 COWPER ROAD: Plot and Title Map

42 COWPER ROAD sits on a plot of roughly 0.053 of an acre, or 215m². The below map shows the location of 42 COWPER 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 42 COWPER 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 42 COWPER ROAD?

42 COWPER ROAD is located in HARPENDEN, in the AL5 postcode district. The below map shows the position of No. 42 on COWPER ROAD.