SION HOUSE, OAKHURST AVENUE, HARPENDEN, AL5 2ND - £1,705,000

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

SION HOUSE is a very large detached house of 293m², built sometime between 1991 and 1995, which could now be worth an estimated £2,901,375. It was last sold for £1,705,000 in February 2013, which was around 134% above the average February 2013 detached price in the St Albans local authority area. The most recent EPC inspection was June 2012, where the current energy rating was C, and the potential energy rating was C.

SION HOUSE Sold Prices

Land registry data shows two sales for SION HOUSE 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 SION HOUSE 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
2013 28 FEB	£1,705,000	£727,308	134% above HPI
2006 1 MAR	£1,300,000	£546,964	138% above HPI

SION HOUSE 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 SION HOUSE sales from March 2006 and February 2013 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 March 2006 sale was for 138% above the HPI. So the extrapolation line tracks at 138% above the HPI over time, until the February 2013 sale, where it falls to 134% above the HPI. The line then continues to track at 134% above the HPI.

What might SION HOUSE be worth now?

SION HOUSE might now be worth an estimated £2,901,375.

This is based on house price inflation of 70.2%, between February 2013 and February 2025, 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 70.2% inflationary increase is applied to the most recent sale price for SION HOUSE of £1,705,000 on 28th February 2013. For the value to have increased from £1,705,000 to £2,901,375 over the twelve years to February 2025, the following assumptions must hold true:

• The value of SION HOUSE has moved in line with the HPI for detached houses in the St Albans local authority area.
• The February 2013 sale price of £1,705,000 represented a fair market value for the property.
• The size, condition, and specification of SION HOUSE has not materially changed since February 2013.

How Large is SION HOUSE?

SION HOUSE is 293m² according to the EPC inspection conducted in June 2012. 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 SION HOUSE lies on this distribution: 88% of detached houses houses are smaller than SION HOUSE, and 12% of houses are larger. Note that EPC data is not available for all properties in Harpenden.

SION HOUSE: Plot and Title Map

SION HOUSE sits on a plot of roughly 0.466 of an acre, or 1,884m². The below map shows the location of SION HOUSE, 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 SION HOUSE). 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 SION HOUSE?

SION HOUSE is located on OAKHURST AVENUE in HARPENDEN, in the AL5 postcode district. The below map shows the position of SION HOUSE on OAKHURST AVENUE.