20, KNOWBURY AVENUE, PENARTH, CF64 5RX - £680,000

Based on the December 2024 Price Paid Data (released on 29th January 2025), the November 2024 House Price Index (released on 15th January 2025), and the December 2024 Energy Performance of Buildings Data (released on 31st January 2025). Sources

20 KNOWBURY AVENUE is a very large detached house of 203m², built sometime between 1967 and 1975. It was last sold for £680,000 in February 2021, which was around 74% above the average February 2021 detached price in the Vale of Glamorgan local authority area. The most recent EPC inspection was November 2019, where the current energy rating was E, and the potential energy rating was C.

20 KNOWBURY AVENUE Sold Prices

Land registry data shows two sales for 20 KNOWBURY AVENUE since 1^st January 1995. The below table shows the price paid for the two sales, along with the average detached price in the Vale of Glamorgan local authority area for the corresponding sale date. Both of the two 20 KNOWBURY AVENUE 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
2021 22 FEB	£680,000	£390,822	74% above HPI
1997 31 JAN	£151,500	£94,159	61% above HPI

20 KNOWBURY AVENUE Price Paid vs. HPI Average

The below graph shows the average detached house price in the Vale of Glamorgan local authority area over time, sourced from the HPI. The two 20 KNOWBURY AVENUE sales from January 1997 and February 2021 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 January 1997 sale was for 61% above the HPI. So the extrapolation line tracks at 61% above the HPI over time, until the February 2021 sale, where it rises to 74% above the HPI. The line then continues to track at 74% above the HPI.

How Large is 20 KNOWBURY AVENUE?

20 KNOWBURY AVENUE is 203m² according to the EPC inspection conducted in November 2019. This puts it in the largest 20% of detached houses in Penarth, based on EPC data. The below chart shows the distribution of detached houses by size in Penarth, and where 20 KNOWBURY AVENUE lies on this distribution: 83% of detached houses are smaller than 20 KNOWBURY AVENUE, and 16% of houses are larger. Note that EPC data is not available for all properties in Penarth.

20 KNOWBURY AVENUE: Plot and Title Map

20 KNOWBURY AVENUE sits on a plot of roughly 0.133 of an acre, or 539m². The below map shows the location of 20 KNOWBURY AVENUE, 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 20 KNOWBURY AVENUE). 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 20 KNOWBURY AVENUE?

20 KNOWBURY AVENUE is located in PENARTH, in the CF64 postcode district. The below map shows the position of No. 20 on KNOWBURY AVENUE.