House prices in 'HP18 9', Long Crendon

Price per square metre data and charts revealed. Latest statistics for the housing market in 'HP18 9' (Long Crendon) - calculated on 01 December 2025.

Defining 'HP18 9'

This analysis is limited to properties whose postcode starts with "HP18 9", this is also called the postcode sector. There are no official postcode sector names so I've just labelled it HP18 9, Long Crendon. It is shown in red on the map below.

Want to change geography?

You can click on the map above to change to a neighbouring sector, or you can use the search form below.

Price per square metre

Knowing the average house price in HP18 9 is not much use. However, knowing average price per square metre can be quite useful. Price per sqm allows some comparison between properties of different size. We define price per square metre as the sold price divided by the internal area of a property:

£ per sqm = price ÷ internal area

For example in October 2025, 32, Manor Road, Long Crendon, HP18 9QT sold for £391,442. Given the internal area of 78 square metres recorded on the EPC, the price per sqm is £391,442 ÷ 78 sqm = £5,018.

England & Wales have been officially metric since 1965. However house price per square foot is prefered by some estate agents and those of sufficiently advanced age ;-). It is a huge pain to code the automatic conversion for square meters to square feet for all the graphs and charts on HP18 9 and elsewhere. All the conditionals turn my tidy code for into spaghetti. I will get around to it at some point, but for now you can just divide everything by 10 in your head, move a decimal place and you'll be close enough. If you want to be more precise 1 sqm = 10.76391 sqft.

Distribution of £ per sqm for 'HP18 9' vs 'HP18'

The chart above is called a histogram, it helps you see the distribution of house price per sqm in HP18 9 To make this chart we put all the sales data into a series of £ per sqm 'buckets' (e.g. £5,350 to £5,500, £5,500 to £5,650, £5,650 to £5,800 etc...) we then count the number of sales with within in each bucket and plot the results. The histogram is based on 157 sales that took place in HP18 9, Long Crendon in the last 24 months.

Generate a custom histogram like the one above but based on your own criteria.

You can see the spread of prices above. This is because although internal area is a key factor in determining valuation, it is not the only factor. Many factors other than size affect desirability; these factors could be condition, aspect, garden size, negotiating power of the vendor etc.

The spread of prices will give you a feel of the typical range to expect in HP18 9, Long Crendon. Notably, only 25% of properties that sold recently were valued at more than £5,500 sqm. For anything to be valued more than this means it has to be more desireable than the clear majority of HP18 9 homes.

Box plot of £ per sqm for HP18 9

Tip: click on the chart to see the values.

The chart above is called a boxplot (or a box-and-whisker plot). Box plots, like histograms, are used to graphically represent the distribution of data, showing the central tendency, spread of the distribution. In the context of £ per square metre property price distributions, box plots represent the variation in property prices within a geographic area e.g. Long Crendon. The chart above shows a boxplot for 'HP18 9' as well as the 'HP18' postcode district.

  • Median: The horizontal line inside the box represents the median (£ per square meter). This is the midpoint of the data, meaning 50% of the prices are below this value, and 50% are above. The middle price per square metre in 'HP18 9' is £4,850.
  • Interquartile Range (IQR): The box spans from the 25th percentile (Q1) to the 75th percentile (Q3). This is the range where the middle 50% of the data lies, giving a good indication of the typical price spread. Of the 157 transactions in HP18 9, Long Crendon half were sold for between £4,410 and £5,500 per square metre.
  • Whiskers: In our case, the whiskers extend from the 9th percentile (at the lower end) to the 91st percentile (at the upper end), This provides a slightly broader view of the distribution by including the middle 82% of records. The whiskers capture most of the variation but exclude extreme outliers caused by data errors in recording sold house prices or internal area.
  • 'n=' is the number of property transactions the box plot is based on; 157 for HP18 9, Long Crendon.

    • Property price map for Long Crendon

    Have a look at the interactive price map I created for myself. Use it to explore 'HP18 9' house prices all the way down to individual property plots.

    Property price heatmap for Long Crendon
    House price map for Long Crendon

    Long Crendon house price forecasting

    House prices in HP18 9 fell -1.3% in the last year, -5.0% after inflation. Whether or not this trend will continue depends on many factors, such as wage growth, net migration, interest rates and the level of house building. No one can predict these things with certainty however we can plot the historic trends in house prices in HP18 9 (Long Crendon) compared with the wider postcode district of HP18.

    House price index for HP18 9

    Tip: click on the legend items to show/hide different lines

    Download house price index as CSV (premium users only).

    The chart above shows changes in 'HP18 9' property prices over the last 20 years. The index is calculated from the average price paid per sqm for property in HP18 9 and is set to 100 in 2004. I'm comparing the trends for HP18 9,Long Crendon with the wider postcode district of HP18 What is more interesting is to look at the difference between flats and houses, even those in the same area follow a very different trend, to get a robust enough sample size to see this we need to zoom out and look at house price trends for the entire Buckinghamshire local authority.

    The dashed lines show nominal house price changes, the solid lines show the same data adjusted for inflation. Economists call this the 'real' price change. You have to take inflation into account when comparing prices over time. It's calculated using the formula:

    Real Rate of Return = (1 + Nominal Rate) ÷ (1 + Inflation Rate) – 1
    In this formula, the nominal rate is the rate of change before any adjustments, and the inflation rate is taken from the Consumer Price Index. The real rate of return is a more accurate measure of change in value, because £1 today does not have the same buying power as £1 in the past. For example, if a savings account pays an interest rate of 3% per year and the inflation rate is 5% per year, the real rate of return is -2%. This means that the investment's value is shrinking by 2% each year.

    Historic returns for HP18 9
    HP18 9 sector HP18 district
    Nominal Real Nominal Real
    20 yr per annum 3.6% 0.8% 3.0% 0.2%
    20 yr total 101.6% 16.8% 80.0% 4.3%
    10 yr per annum 2.9% -0.3% 3.1% -0.0%
    10 yr total 32.5% -2.7% 35.9% -0.2%
    5 yr per annum 4.0% -0.5% 3.5% -0.9%
    5 yr total 21.9% -2.3% 18.9% -4.7%
    1 yr per annum -1.3% -5.0% -0.1% -3.9%
    1 yr total -1.3% -5.0% -0.1% -3.9%

    This table complements the house price index chart above, presenting the data in a more detailed format. It breaks down the information into 20-year, 10-year, 5-year, and 1-year periods, further categorized by property type. For each period, we display both a per annum rate of change and a total rate of change.

    The total rate of change represents the overall change over the entire period. The formula for total return is:

    Total return = (Index at end of period ÷ Index at start of period) - 1

    The per annum rate of change is the annualized rate of change over the period. This is equivalent to the annual bank savings rate you would need to achieve the same total return over the given period. This annualized return is also known as the Compound Annual Growth Rate (CAGR). The formula for CAGR is:

    CAGR = (1 + Total return) ^ (1 ÷ Number of years) - 1

    Some specific examples:

    • Over the past 20 years, HP18 9 sector have seen a 0.8% annual change when adjusted for inflation. This translates to a total change of 16.8% in real terms.
    • Over the past 5 years, HP18 district have seen a -0.9% annual change when adjusted for inflation. This translates to a total change of -4.7% in real terms.

    Most recent HP18 9 sales

    For the most recent sales activity, rather than a summarized average, it is better to see the underlying data. This is shown in the chart below, where blue dots represent individual sales, click on them to see details. If there is an obvious trend you should be able to spot it here amid the noise from outliers.

    Tip: hover over dots to see details

    Street level data

    Street Avg size Avg £sqm Recent sales
    Giffard Way, Long Crendon, HP18 9D 104 sqm £4,520 10
    The Lawns, Long Crendon, HP18 9S 81 sqm £5,321 10
    High Street, Long Crendon, HP18 9A 117 sqm £6,640 9
    Temple Street, Long Crendon, HP18 9S 121 sqm £4,868 9
    Clifden Road, Long Crendon, HP18 9J 128 sqm £4,799 8
    Friars Furlong, Long Crendon, HP18 9D 93 sqm £5,781 7
    Lower Farm Close, Long Crendon, HP18 9H 132 sqm £4,612 6
    Hilltop, Long Crendon, HP18 9A 89 sqm £4,274 6

    Search for your street here.

    Nearby geographies

    The table below shows how 'HP18 9' compares to the other postcode sectors in HP18.

    Sector Lower quartile Median Upper quartile Sales in last 2yr
    OX9 3 Thame £4,430 sqm £5,090 sqm £5,770 sqm 333
    OX9 2 Thame £4,590 sqm £5,110 sqm £5,850 sqm 121
    OX5 2 Kidlington £3,890 sqm £4,490 sqm £5,250 sqm 200
    OX33 1 Wheatley £4,230 sqm £4,920 sqm £5,430 sqm 151
    OX25 1 Upper Arncott £3,540 sqm £3,830 sqm £4,230 sqm 28
    HP18 9 Long Crendon £4,410 sqm £4,850 sqm £5,500 sqm 157
    HP18 1 Long Crendon £3,530 sqm £3,800 sqm £4,680 sqm 58
    HP18 0 Waddesdon £3,570 sqm £4,030 sqm £4,470 sqm 276
    HP17 8 Haddenham £4,270 sqm £4,940 sqm £5,280 sqm 280

    Raw data

    Our analysis of HP18 9 is derived from what is essentially a big table of sold prices from Land Registry with added property size information. Below are three rows from this table to give you an idea.

    Address Paid sqm £/sqm
    32, Manor Rd, Long Crendon £391,442
    Oct-2025
    		 78 5,018
    Brae Hill Cottage, Brae Hill, Long Crendon £485,000
    Oct-2025
    		 114 4,254
    5, Bulls Lane, Long Crendon £815,000
    Oct-2025
    		 176 4,630

    See the entire list of all sales in HP18 9 here.

    About

    I created HouseMetric because I wanted to see this data and analysis myself, I also wanted to teach myself to build a website. Please give me feedback or spread the word about it. I'm constantly tinkering and adding more stuff to it.