TARN, LOWER PROSPECT ROAD, OSBASTON, MONMOUTH, NP25 3HS - £680,000

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.

TARN is a very large extended detached house of 172m², built sometime between 1976 and 1982, which could now be worth an estimated £657,329. It was last sold for £680,000 in June 2025, which was around 36% above the average June 2025 detached price in the Monmouthshire local authority area. The most recent EPC inspection was January 2024, where the current energy rating was F, and the potential energy rating was D.

TARN Sold Prices

Land registry data shows two sales for TARN since 1^st January 1995. The below table shows the price paid for the two sales, along with the average detached price in the Monmouthshire local authority area for the corresponding sale date. Both of the two TARN 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 25 JUN	£680,000	£501,239	36% above HPI
2017 18 JUL	£345,000	£336,183	3% above HPI

TARN Price Paid vs. HPI Average

The below graph shows the average detached house price in the Monmouthshire local authority area over time, sourced from the HPI. The two TARN sales from July 2017 and June 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 July 2017 sale was for 3% above the HPI. So the extrapolation line tracks at 3% above the HPI over time, until the June 2025 sale, where it rises to 36% above the HPI. The line then continues to track at 36% above the HPI.

What might TARN be worth now?

TARN might now be worth an estimated £657,329.

This is based on house price deflation of 3.3%, between June 2025 and May 2026, for detached houses, in the Monmouthshire local authority area, as calculated by the Office for National Statistics and published in their UK House Price Index (HPI).

The 3.3% deflationary decrease is applied to the most recent sale price for TARN of £680,000 on 25th June 2025. For the value to have decreased from £680,000 to £657,329 over the one year and one month to May 2026, the following assumptions must hold true:

• The value of TARN has moved in line with the HPI for detached houses in the Monmouthshire local authority area.
• The June 2025 sale price of £680,000 represented a fair market value for the property.
• The size, condition, and specification of TARN has not materially changed since June 2025.

How Large is TARN?

TARN is 172m², which includes two extensions, according to the EPC inspection conducted in January 2024. This puts it in the largest 20% of detached houses houses in Monmouth, based on EPC data. The below chart shows the distribution of detached houses houses by size in Monmouth, and where TARN lies on this distribution: 86% of detached houses houses are smaller than TARN, and 14% of houses are larger. Note that EPC data is not available for all properties in Monmouth.

TARN: Plot and Title Map

TARN sits on a plot of roughly 0.248 of an acre, or 1,002m². The below map shows the location of TARN, 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 TARN). 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 TARN?

TARN is located on LOWER PROSPECT ROAD in OSBASTON, in the NP25 postcode district. The below map shows the position of TARN on LOWER PROSPECT ROAD.