18, PENTWYN ISAF, CAERPHILLY, CF83 2NR - £440,000

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.

18 PENTWYN ISAF is a very large extended detached house of 165m², built sometime between 1983 and 1990. It was last sold for £440,000 in April 2026, which was around 38% above the average April 2026 detached price in the Caerphilly local authority area. The most recent EPC inspection was July 2025, where the current energy rating was D, and the potential energy rating was C.

18 PENTWYN ISAF Sold Prices

Land registry data shows four sales for 18 PENTWYN ISAF since 1^st January 1995. The below table shows the price paid for the four sales, along with the average detached price in the Caerphilly local authority area for the corresponding sale date. All of the four 18 PENTWYN ISAF 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
2026 10 APR	£440,000	£318,843	38% above HPI
2002 9 AUG	£110,000	£98,290	12% above HPI
2000 24 FEB	£88,000	£73,820	19% above HPI
1996 19 SEP	£92,950	£67,001	39% above HPI

18 PENTWYN ISAF Price Paid vs. HPI Average

The below graph shows the average detached house price in the Caerphilly local authority area over time, sourced from the HPI. The four 18 PENTWYN ISAF sales between September 1996 and April 2026 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 August 2002 sale was for 12% above the HPI. So the extrapolation line tracks at 12% above the HPI over time, until the April 2026 sale, where it rises to 38% above the HPI. The line then continues to track at 38% above the HPI.

How Large is 18 PENTWYN ISAF?

18 PENTWYN ISAF is 165m², which includes four extensions, according to the EPC inspection conducted in July 2025. This puts it in the largest 10% of detached houses houses in Caerphilly, based on EPC data. The below chart shows the distribution of detached houses houses by size in Caerphilly, and where 18 PENTWYN ISAF lies on this distribution: 92% of detached houses houses are smaller than 18 PENTWYN ISAF, and 8% of houses are larger. Note that EPC data is not available for all properties in Caerphilly.

18 PENTWYN ISAF: Plot and Title Map

18 PENTWYN ISAF sits on a plot of roughly 0.139 of an acre, or 561m². The below map shows the location of 18 PENTWYN ISAF, 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 18 PENTWYN ISAF). 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 18 PENTWYN ISAF?

18 PENTWYN ISAF is located in CAERPHILLY, in the CF83 postcode district. The below map shows the position of No. 18 on PENTWYN ISAF.