ROSELYON, REDBOURN LANE, HARPENDEN, AL5 2AZ - £1,800,000

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

ROSELYON is a very large extended detached house of 361m², built sometime between 1930 and 1949, which could now be worth an estimated £2,171,323. It was last sold for £1,800,000 in November 2018, which was around 74% above the average November 2018 detached price in the St Albans local authority area. The most recent EPC inspection was April 2017, where the current energy rating was D, and the potential energy rating was C.

ROSELYON Sold Prices

Land registry data shows three sales for ROSELYON since 1^st January 1995. The below table shows the price paid for the three sales, along with the average detached price in the St Albans local authority area for the corresponding sale date. All of the three ROSELYON 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
2018 23 NOV	£1,800,000	£1,031,700	74% above HPI
2005 24 NOV	£865,000	£543,003	59% above HPI
2001 26 OCT	£820,000	£408,634	101% above HPI

ROSELYON 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 three ROSELYON sales between October 2001 and November 2018 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 November 2005 sale was for 59% above the HPI. So the extrapolation line tracks at 59% above the HPI over time, until the November 2018 sale, where it rises to 74% above the HPI. The line then continues to track at 74% above the HPI.

What might ROSELYON be worth now?

ROSELYON might now be worth an estimated £2,171,323.

This is based on house price inflation of 20.6%, between November 2018 and December 2024, 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 20.6% inflationary increase is applied to the most recent sale price for ROSELYON of £1,800,000 on 23rd November 2018. For the value to have increased from £1,800,000 to £2,171,323 over the five years and eleven months to December 2024, the following assumptions must hold true:

• The value of ROSELYON has moved in line with the HPI for detached houses in the St Albans local authority area.
• The November 2018 sale price of £1,800,000 represented a fair market value for the property.
• The size, condition, and specification of ROSELYON has not materially changed since November 2018.

How Large is ROSELYON?

ROSELYON is 361m², which includes two extensions, according to the EPC inspection conducted in April 2017. This puts it in the largest 10% 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 ROSELYON lies on this distribution: 93% of detached houses houses are smaller than ROSELYON, and 7% of houses are larger. Note that EPC data is not available for all properties in Harpenden.

ROSELYON: Plot and Title Map

ROSELYON sits on a plot of roughly 0.411 of an acre, or 1,665m². The below map shows the location of ROSELYON, 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 ROSELYON). 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 ROSELYON?

ROSELYON is located on REDBOURN LANE in HARPENDEN, in the AL5 postcode district. The below map shows the position of ROSELYON on REDBOURN LANE.