ISGAER, PORTHMADOG, LL49 9PD - £180,000

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

ISGAER is a very large extended detached house of 159m², built sometime between 1950 and 1966, which could now be worth an estimated £240,000. It was last sold for £180,000 in April 2018, which was around 19% below the average April 2018 detached price in the Gwynedd local authority area. The most recent EPC inspection was June 2010, where the current energy rating was E, and the potential energy rating was C.

ISGAER Sold Prices

Land registry data shows two sales for ISGAER since 1^st January 1995. The below table shows the price paid for the two sales, along with the average detached price in the Gwynedd local authority area for the corresponding sale date. One of the two ISGAER sales was for below the average price, whilst the other was 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
2018 16 APR	£180,000	£222,054	19% below HPI
1997 17 MAR	£100,000	£63,107	58% above HPI

ISGAER Price Paid vs. HPI Average

The below graph shows the average detached house price in the Gwynedd local authority area over time, sourced from the HPI. The two ISGAER sales from March 1997 and April 2018 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 March 1997 sale was for 58% above the HPI. So the extrapolation line tracks at 58% above the HPI over time, until the April 2018 sale, where it falls to 19% below the HPI. The line then continues to track at 19% below the HPI.

What might ISGAER be worth now?

ISGAER might now be worth an estimated £240,000.

This is based on house price inflation of 33.3%, between April 2018 and December 2024, for detached houses, in the Gwynedd local authority area, as calculated by the Office for National Statistics and published in their UK House Price Index (HPI).

The 33.3% inflationary increase is applied to the most recent sale price for ISGAER of £180,000 on 16th April 2018. For the value to have increased from £180,000 to £240,000 over the five years and four months to December 2024, the following assumptions must hold true:

• The value of ISGAER has moved in line with the HPI for detached houses in the Gwynedd local authority area.
• The April 2018 sale price of £180,000 represented a fair market value for the property.
• The size, condition, and specification of ISGAER has not materially changed since April 2018.

How Large is ISGAER?

ISGAER is 159m², which includes one extension, according to the EPC inspection conducted in June 2010. This puts it in the largest 20% of detached houses houses in Porthmadog, based on EPC data. The below chart shows the distribution of detached houses houses by size in Porthmadog, and where ISGAER lies on this distribution: 89% of detached houses houses are smaller than ISGAER, and 11% of houses are larger. Note that EPC data is not available for all properties in Porthmadog.

ISGAER: Plot and Title Map

ISGAER sits on a plot of roughly 0.432 of an acre, or 1,748m². The below map shows the location of ISGAER, 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 ISGAER). 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 ISGAER?

ISGAER is located in PORTHMADOG, in the LL49 postcode district. The below map shows the position of ISGAER in PORTHMADOG.