44, HARMER GREEN LANE, WELWYN, AL6 0AT - £845,000

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.

44 HARMER GREEN LANE is a very large extended detached house of 238m², built sometime between 1900 and 1929, which could now be worth an estimated £1,434,173. It was last sold for £845,000 in March 2011, which was around 53% above the average March 2011 detached price in the Welwyn Hatfield local authority area. The most recent EPC inspection was October 2024, where the current energy rating was B, and the potential energy rating was A.

44 HARMER GREEN LANE Sold Prices

Land registry data shows two sales for 44 HARMER GREEN LANE 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 44 HARMER GREEN LANE 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
2011 23 MAR	£845,000	£552,637	53% above HPI
2004 30 JUN	£700,000	£449,866	56% above HPI

44 HARMER GREEN LANE 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 44 HARMER GREEN LANE sales from June 2004 and March 2011 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 June 2004 sale was for 56% above the HPI. So the extrapolation line tracks at 56% above the HPI over time, until the March 2011 sale, where it falls to 53% above the HPI. The line then continues to track at 53% above the HPI.

What might 44 HARMER GREEN LANE be worth now?

44 HARMER GREEN LANE might now be worth an estimated £1,434,173.

This is based on house price inflation of 69.7%, between March 2011 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 69.7% inflationary increase is applied to the most recent sale price for 44 HARMER GREEN LANE of £845,000 on 23rd March 2011. For the value to have increased from £845,000 to £1,434,173 over the fourteen years and one month to February 2025, the following assumptions must hold true:

• The value of 44 HARMER GREEN LANE has moved in line with the HPI for detached houses in the Welwyn Hatfield local authority area.
• The March 2011 sale price of £845,000 represented a fair market value for the property.
• The size, condition, and specification of 44 HARMER GREEN LANE has not materially changed since March 2011.

How Large is 44 HARMER GREEN LANE?

44 HARMER GREEN LANE is 238m², which includes two extensions, according to the EPC inspection conducted in October 2024. This puts it in the largest 10% of detached houses houses in Welwyn Garden City, based on EPC data. The below chart shows the distribution of detached houses houses by size in Welwyn Garden City, and where 44 HARMER GREEN LANE lies on this distribution: 94% of detached houses houses are smaller than 44 HARMER GREEN LANE, and 6% of houses are larger. Note that EPC data is not available for all properties in Welwyn Garden City.

44 HARMER GREEN LANE: Plot and Title Map

44 HARMER GREEN LANE sits on a plot of roughly 0.452 of an acre, or 1,830m². The below map shows the location of 44 HARMER GREEN LANE, 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 44 HARMER GREEN LANE). 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 44 HARMER GREEN LANE?

44 HARMER GREEN LANE is located in WELWYN, in the AL6 postcode district. The below map shows the position of No. 44 on HARMER GREEN LANE.