17, MARDLEY AVENUE, WELWYN, AL6 0TU - £750,000

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.

17 MARDLEY AVENUE is a midsized detached house of 160m², built sometime between 1967 and 1975, which could now be worth an estimated £755,217. It was last sold for £750,000 in January 2025, which was around 19% below the average January 2025 detached price in the Welwyn Hatfield local authority area. The most recent EPC inspection was July 2023, where the current energy rating was D, and the potential energy rating was A.

17 MARDLEY AVENUE Sold Prices

Land registry data shows two sales for 17 MARDLEY AVENUE since 1^st January 1995. The below table shows the price paid for the two sales, along with the average detached price in the Welwyn Hatfield local authority area for the corresponding sale date. Both of the two 17 MARDLEY AVENUE sales were 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
2025 31 JAN	£750,000	£931,481	19% below HPI
2006 18 DEC	£395,000	£481,079	18% below HPI

17 MARDLEY AVENUE Price Paid vs. HPI Average

The below graph shows the average detached house price in the Welwyn Hatfield local authority area over time, sourced from the HPI. The two 17 MARDLEY AVENUE sales from December 2006 and January 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 December 2006 sale was for 18% below the HPI. So the extrapolation line tracks at 18% below the HPI over time, until the January 2025 sale, where it falls to 19% below the HPI. The line then continues to track at 19% below the HPI.

What might 17 MARDLEY AVENUE be worth now?

17 MARDLEY AVENUE might now be worth an estimated £755,217.

This is based on house price inflation of 0.7%, between January 2025 and February 2025, for detached houses, in the Welwyn Hatfield local authority area, as calculated by the Office for National Statistics and published in their UK House Price Index (HPI).

The 0.7% inflationary increase is applied to the most recent sale price for 17 MARDLEY AVENUE of £750,000 on 31st January 2025. For the value to have increased from £750,000 to £755,217 over the eleven months to February 2025, the following assumptions must hold true:

• The value of 17 MARDLEY AVENUE has moved in line with the HPI for detached houses in the Welwyn Hatfield local authority area.
• The January 2025 sale price of £750,000 represented a fair market value for the property.
• The size, condition, and specification of 17 MARDLEY AVENUE has not materially changed since January 2025.

How Large is 17 MARDLEY AVENUE?

17 MARDLEY AVENUE is 160m² according to the EPC inspection conducted in July 2023. This puts it in the largest 50% of detached houses houses in Oaklands, based on EPC data. The below chart shows the distribution of detached houses houses by size in Oaklands, and where 17 MARDLEY AVENUE lies on this distribution: 52% of detached houses houses are smaller than 17 MARDLEY AVENUE, and 48% of houses are larger. Note that EPC data is not available for all properties in Oaklands.

17 MARDLEY AVENUE: Plot and Title Map

17 MARDLEY AVENUE sits on a plot of roughly 0.128 of an acre, or 517m². The below map shows the location of 17 MARDLEY AVENUE, 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 17 MARDLEY AVENUE). 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 17 MARDLEY AVENUE?

17 MARDLEY AVENUE is located in WELWYN, in the AL6 postcode district. The below map shows the position of No. 17 on MARDLEY AVENUE.