20, MOUNTJOY AVENUE, PENARTH, CF64 2SY - £499,000

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.

20 MOUNTJOY AVENUE is a small semi-detached house of 117m², built sometime between 1950 and 1966. It was last sold for £499,000 in February 2025, which was around 67% above the average February 2025 semi-detached price in the Vale of Glamorgan local authority area. The most recent EPC inspection was August 2024, where the current energy rating was C, and the potential energy rating was B.

20 MOUNTJOY AVENUE Sold Prices

Land registry data shows three sales for 20 MOUNTJOY AVENUE since 1^st January 1995. The below table shows the price paid for the three sales, along with the average semi-detached price in the Vale of Glamorgan local authority area for the corresponding sale date. All of the three 20 MOUNTJOY 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
2025 12 FEB	£499,000	£299,669	67% above HPI
2017 23 JUN	£342,000	£207,178	65% above HPI
1999 22 JAN	£85,000	£63,010	35% above HPI

20 MOUNTJOY AVENUE Price Paid vs. HPI Average

The below graph shows the average semi-detached house price in the Vale of Glamorgan local authority area over time, sourced from the HPI. The three 20 MOUNTJOY AVENUE sales between January 1999 and February 2025 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 2017 sale was for 65% above the HPI. So the extrapolation line tracks at 65% above the HPI over time, until the February 2025 sale, where it rises to 67% above the HPI. The line then continues to track at 67% above the HPI.

How Large is 20 MOUNTJOY AVENUE?

20 MOUNTJOY AVENUE is 117m² according to the EPC inspection conducted in August 2024. This puts it in the smallest 40% of semi-detached houses houses in Penarth, based on EPC data. The below chart shows the distribution of semi-detached houses houses by size in Penarth, and where 20 MOUNTJOY AVENUE lies on this distribution: 33% of semi-detached houses houses are smaller than 20 MOUNTJOY AVENUE, and 66% of houses are larger. Note that EPC data is not available for all properties in Penarth.

20 MOUNTJOY AVENUE: Plot and Title Map

20 MOUNTJOY AVENUE sits on a plot of roughly 0.084 of an acre, or 340m². The below map shows the location of 20 MOUNTJOY 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 MOUNTJOY 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 MOUNTJOY AVENUE?

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