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 NANT TWYN HARRIS is a very small terraced house of 55m², built sometime between 1996 and 2002, which could now be worth an estimated £200,171. It was last sold for £127,500 in August 2017, which was around 24% above the average August 2017 terraced price in the Caerphilly local authority area. The most recent EPC inspection was June 2017, where the current energy rating was C, and the potential energy rating was B.
Land registry data shows four sales for 18 NANT TWYN HARRIS since 1st January 1995. The below table shows the price paid for the four sales, along with the average terraced price in the Caerphilly local authority area for the corresponding sale date. All of the four 18 NANT TWYN HARRIS 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 |
|---|---|---|---|
2017 18 AUG | £127,500 | £102,858 | 24% above HPI |
2003 24 OCT | £80,500 | £58,815 | 37% above HPI |
1999 5 NOV | £44,250 | £35,219 | 26% above HPI |
1997 14 FEB | £44,995 | £30,656 | 47% above HPI |
The below graph shows the average terraced house price in the Caerphilly local authority area over time, sourced from the HPI. The four 18 NANT TWYN HARRIS sales between February 1997 and August 2017 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 October 2003 sale was for 37% above the HPI. So the extrapolation line tracks at 37% above the HPI over time, until the August 2017 sale, where it falls to 24% above the HPI. The line then continues to track at 24% above the HPI.

18 NANT TWYN HARRIS might now be worth an estimated £200,171.
This is based on house price inflation of 57%, between August 2017 and July 2025, for terraced houses, in the Caerphilly local authority area, as calculated by the Office for National Statistics and published in their UK House Price Index (HPI).
The 57% inflationary increase is applied to the most recent sale price for 18 NANT TWYN HARRIS of £127,500 on 18th August 2017. For the value to have increased from £127,500 to £200,171 over the eight years and one month to July 2025, the following assumptions must hold true:
18 NANT TWYN HARRIS is 55m² according to the EPC inspection conducted in June 2017. This puts it in the smallest 10% of terraced houses houses in Ystrad Mynach, based on EPC data. The below chart shows the distribution of terraced houses houses by size in Ystrad Mynach, and where 18 NANT TWYN HARRIS lies on this distribution: 1% of terraced houses houses are smaller than 18 NANT TWYN HARRIS, and 99% of houses are larger. Note that EPC data is not available for all properties in Ystrad Mynach.

18 NANT TWYN HARRIS sits on a plot of roughly 0.038 of an acre, or 153m². The below map shows the location of 18 NANT TWYN HARRIS, 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 NANT TWYN HARRIS). 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.

18 NANT TWYN HARRIS is located in YSTRAD MYNACH, in the CF82 postcode district. The below map shows the position of No. 18 on NANT TWYN HARRIS.

Most recent sales first: