SUMNER, SCHOOL LANE, COOKHAM, MAIDENHEAD, SL6 9QJ - £2,000,000

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.

SUMNER is a large extended detached house of 219m², built sometime between 1950 and 1966, which could now be worth an estimated £2,117,722. It was last sold for £2,000,000 in January 2024, which was around 84% above the average January 2024 detached price in the Windsor and Maidenhead local authority area. The most recent EPC inspection was August 2023, where the current energy rating was D, and the potential energy rating was C.

SUMNER Sold Prices

Land registry data shows two sales for SUMNER since 1^st January 1995. The below table shows the price paid for the two sales, along with the average detached price in the Windsor and Maidenhead local authority area for the corresponding sale date. Both of the two SUMNER 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
2024 19 JAN	£2,000,000	£1,085,610	84% above HPI
2006 22 MAY	£570,000	£541,234	5% above HPI

SUMNER Price Paid vs. HPI Average

The below graph shows the average detached house price in the Windsor and Maidenhead local authority area over time, sourced from the HPI. The two SUMNER sales from May 2006 and January 2024 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 May 2006 sale was for 5% above the HPI. So the extrapolation line tracks at 5% above the HPI over time, until the January 2024 sale, where it rises to 84% above the HPI. The line then continues to track at 84% above the HPI.

What might SUMNER be worth now?

SUMNER might now be worth an estimated £2,117,722.

This is based on house price inflation of 5.9%, between January 2024 and February 2025, for detached houses, in the Windsor and Maidenhead local authority area, as calculated by the Office for National Statistics and published in their UK House Price Index (HPI).

The 5.9% inflationary increase is applied to the most recent sale price for SUMNER of £2,000,000 on 19th January 2024. For the value to have increased from £2,000,000 to £2,117,722 over the eleven months to February 2025, the following assumptions must hold true:

• The value of SUMNER has moved in line with the HPI for detached houses in the Windsor and Maidenhead local authority area.
• The January 2024 sale price of £2,000,000 represented a fair market value for the property.
• The size, condition, and specification of SUMNER has not materially changed since January 2024.

How Large is SUMNER?

SUMNER is 219m², which includes three extensions, according to the EPC inspection conducted in August 2023. This puts it in the largest 40% of detached houses houses in Cookham, based on EPC data. The below chart shows the distribution of detached houses houses by size in Cookham, and where SUMNER lies on this distribution: 66% of detached houses houses are smaller than SUMNER, and 34% of houses are larger. Note that EPC data is not available for all properties in Cookham.

SUMNER: Plot and Title Map

SUMNER sits on a plot of roughly 0.212 of an acre, or 859m². The below map shows the location of SUMNER, 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 SUMNER). 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 SUMNER?

SUMNER is located on SCHOOL LANE in COOKHAM, in the SL6 postcode district. The below map shows the position of SUMNER on SCHOOL LANE.