18, CASTELL LLWYD, YSTRAD MYNACH, HENGOED, CF82 7DJ - £125,000

Based on the January 2025 Price Paid Data (released on 3rd March 2025), the December 2024 House Price Index (released on 19th February 2025), and the January 2025 Energy Performance of Buildings Data (released on 27th February 2025). Sources

18 CASTELL LLWYD is a very small detached house of 78m², built sometime between 1996 and 2002, which could now be worth an estimated £353,614. It was last sold for £125,000 in June 2003, which was around 14% above the average June 2003 detached price in the Caerphilly local authority area. The most recent EPC inspection was August 2013, where the current energy rating was C, and the potential energy rating was B.

18 CASTELL LLWYD Sold Prices

Land registry data shows two sales for 18 CASTELL LLWYD since 1^st January 1995. The below table shows the price paid for the two sales, along with the average detached price in the Caerphilly local authority area for the corresponding sale date. One of the two 18 CASTELL LLWYD sales was for above the average price, whilst the other was for below 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
2003 4 JUN	£125,000	£109,418	14% above HPI
2002 28 FEB	£85,995	£86,516	1% below HPI

18 CASTELL LLWYD 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 two 18 CASTELL LLWYD sales from February 2002 and June 2003 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 February 2002 sale was for 1% below the HPI. So the extrapolation line tracks at 1% below the HPI over time, until the June 2003 sale, where it rises to 14% above the HPI. The line then continues to track at 14% above the HPI.

What might 18 CASTELL LLWYD be worth now?

18 CASTELL LLWYD might now be worth an estimated £353,614.

This is based on house price inflation of 182.9%, between June 2003 and December 2024, for detached 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 182.9% inflationary increase is applied to the most recent sale price for 18 CASTELL LLWYD of £125,000 on 4th June 2003. For the value to have increased from £125,000 to £353,614 over the twenty years and six months to December 2024, the following assumptions must hold true:

• The value of 18 CASTELL LLWYD has moved in line with the HPI for detached houses in the Caerphilly local authority area.
• The June 2003 sale price of £125,000 represented a fair market value for the property.
• The size, condition, and specification of 18 CASTELL LLWYD has not materially changed since June 2003.

How Large is 18 CASTELL LLWYD?

18 CASTELL LLWYD is 78m² according to the EPC inspection conducted in August 2013. This puts it in the smallest 10% of detached houses houses in Ystrad Mynach, based on EPC data. The below chart shows the distribution of detached houses houses by size in Ystrad Mynach, and where 18 CASTELL LLWYD lies on this distribution: 10% of detached houses houses are smaller than 18 CASTELL LLWYD, and 90% of houses are larger. Note that EPC data is not available for all properties in Ystrad Mynach.

18 CASTELL LLWYD: Plot and Title Map

18 CASTELL LLWYD sits on a plot of roughly 0.048 of an acre, or 194m². The below map shows the location of 18 CASTELL LLWYD, 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 CASTELL LLWYD). 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 CASTELL LLWYD?

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