21, ROUNDWOOD PARK, HARPENDEN, AL5 3AQ - £1,615,000

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.

21 ROUNDWOOD PARK is a very large extended detached house of 280m², built sometime between 1930 and 1949, which could now be worth an estimated £2,887,378. It was last sold for £1,615,000 in September 2010, which was around 133% above the average September 2010 detached price in the St Albans local authority area. The most recent EPC inspection was January 2020, where the current energy rating was D, and the potential energy rating was C.

21 ROUNDWOOD PARK Sold Prices

Land registry data shows three sales for 21 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 21 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
2010 17 SEP	£1,615,000	£692,256	133% above HPI
2004 23 APR	£1,075,000	£502,378	114% above HPI
2001 30 MAR	£765,000	£389,306	97% above HPI

21 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 21 ROUNDWOOD PARK sales between March 2001 and September 2010 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 April 2004 sale was for 114% above the HPI. So the extrapolation line tracks at 114% above the HPI over time, until the September 2010 sale, where it rises to 133% above the HPI. The line then continues to track at 133% above the HPI.

What might 21 ROUNDWOOD PARK be worth now?

21 ROUNDWOOD PARK might now be worth an estimated £2,887,378.

This is based on house price inflation of 78.8%, between September 2010 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 78.8% inflationary increase is applied to the most recent sale price for 21 ROUNDWOOD PARK of £1,615,000 on 17th September 2010. For the value to have increased from £1,615,000 to £2,887,378 over the fifteen years and seven months to February 2025, the following assumptions must hold true:

• The value of 21 ROUNDWOOD PARK has moved in line with the HPI for detached houses in the St Albans local authority area.
• The September 2010 sale price of £1,615,000 represented a fair market value for the property.
• The size, condition, and specification of 21 ROUNDWOOD PARK has not materially changed since September 2010.

How Large is 21 ROUNDWOOD PARK?

21 ROUNDWOOD PARK is 280m², which includes four extensions, according to the EPC inspection conducted in January 2020. 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 21 ROUNDWOOD PARK lies on this distribution: 86% of detached houses houses are smaller than 21 ROUNDWOOD PARK, and 14% of houses are larger. Note that EPC data is not available for all properties in Harpenden.

21 ROUNDWOOD PARK: Plot and Title Map

21 ROUNDWOOD PARK sits on a plot of roughly 0.443 of an acre, or 1,792m². The below map shows the location of 21 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 21 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 21 ROUNDWOOD PARK?

21 ROUNDWOOD PARK is located in HARPENDEN, in the AL5 postcode district. The below map shows the position of No. 21 on ROUNDWOOD PARK.