35A, ROUNDWOOD PARK, HARPENDEN, AL5 3AG - £1,100,000

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

35A ROUNDWOOD PARK is a very large detached house of 265m², built sometime from 2007 onwards, which could now be worth an estimated £2,457,823. It was last sold for £1,100,000 in May 2009, which was around 97% above the average May 2009 detached price in the St Albans local authority area. The most recent EPC inspection was January 2009, where the current energy rating was C, and the potential energy rating was B.

35A ROUNDWOOD PARK Sold Prices

Land registry data shows three sales for 35A ROUNDWOOD PARK 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 35A ROUNDWOOD PARK 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
2009 6 MAY	£1,100,000	£556,990	97% above HPI
2007 29 JUN	£1,100,000	£641,894	71% above HPI
1996 6 SEP	£285,000	£196,458	45% above HPI

35A ROUNDWOOD PARK 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 35A ROUNDWOOD PARK sales between September 1996 and May 2009 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 2007 sale was for 71% above the HPI. So the extrapolation line tracks at 71% above the HPI over time, until the May 2009 sale, where it rises to 97% above the HPI. The line then continues to track at 97% above the HPI.

What might 35A ROUNDWOOD PARK be worth now?

35A ROUNDWOOD PARK might now be worth an estimated £2,457,823.

This is based on house price inflation of 123.4%, between May 2009 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 123.4% inflationary increase is applied to the most recent sale price for 35A ROUNDWOOD PARK of £1,100,000 on 6th May 2009. For the value to have increased from £1,100,000 to £2,457,823 over the fourteen years and five months to December 2024, the following assumptions must hold true:

• The value of 35A ROUNDWOOD PARK has moved in line with the HPI for detached houses in the St Albans local authority area.
• The May 2009 sale price of £1,100,000 represented a fair market value for the property.
• The size, condition, and specification of 35A ROUNDWOOD PARK has not materially changed since May 2009.

How Large is 35A ROUNDWOOD PARK?

35A ROUNDWOOD PARK is 265m² according to the EPC inspection conducted in January 2009. 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 35A ROUNDWOOD PARK lies on this distribution: 84% of detached houses houses are smaller than 35A ROUNDWOOD PARK, and 16% of houses are larger. Note that EPC data is not available for all properties in Harpenden.

35A ROUNDWOOD PARK: Plot and Title Map

35A ROUNDWOOD PARK sits on a plot of roughly 0.177 of an acre, or 718m². The below map shows the location of 35A ROUNDWOOD PARK, 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 35A ROUNDWOOD PARK). 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 35A ROUNDWOOD PARK?

35A ROUNDWOOD PARK is located in HARPENDEN, in the AL5 postcode district. The below map shows the position of No. 35A on ROUNDWOOD PARK.