House prices in HP8 (Chalfont St Giles)
This article shows price per square metre data and various charts to help you understand the housing market in HP8 - stats were last calculated on 03 December 2024.
Defining 'HP8'
This analysis is limited to properties whose postcode starts with "HP8", this is also called the postcode district. There are no official postcode district names so I've just labelled it HP8, Chalfont St Giles. 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 district, or you can use the search form below.
Price per square metre
Knowing the average house price in HP8 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 2024, 10, Captain Cook Close, Chalfont St Giles, HP8 4DS sold for £500,000. Given the internal area of 106 square metres recorded on the EPC, the price per sqm is £500,000 ÷ 106 sqm = £4,716.
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 HP8 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 houses vs flats in HP8
The chart above is called a histogram, it helps you see the distribution of house price per sqm in HP8 To make this chart we put all the sales data into a series of £ per sqm 'buckets' (e.g. £6,150 to £6,500, £6,500 to £6,850, £6,850 to £7,200 etc...) we then count the number of sales with within in each bucket and plot the results. The histogram is based on 106 sales that took place in HP8, 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 HP8, Chalfont St Giles. Notably, only 25% of properties that sold recently were valued at more than £7,010 sqm. For anything to be valued more than this means it has to be more desireable than the clear majority of HP8 homes.
Box plot of £ per sqm for HP8
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. Chalfont St Giles. The chart above shows a boxplot for 'HP8' as well as the 'HP' postcode area.
Property price map for Chalfont St Giles
Have a look at the interactive price map I created for myself. Use it to explore 'HP8' house prices all the way down to individual property plots.
House price map for Chalfont St GilesWill HP8 house prices drop in 2025?
I cannot tell what house prices will do in the future and don't believe anyone who says they can. However we can plot price trends, I have done this in the chart below for HP8 (Chalfont St Giles) compared with the wider postcode area 'HP'. You can extrapolate from this based on your own views on future interest rates, inflation and other factors.
House price index for HP8
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 'HP8' property prices over the last 20 years. The index is calculated from the average price paid per sqm for property in HP8 and is set to 100 in 2004. The chart compares trends for HP8, Chalfont St Giles against those of the broader postcode area 'HP'. 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) – 1In 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 HP8
| HP area | HP8 district | |||
|---|---|---|---|---|
| Nominal | Real | Nominal | Real | |
| 20 yr per annum | 3.5% | 0.8% | 3.8% | 1.1% |
| 20 yr total | 98.6% | 17.7% | 111.5% | 25.3% |
| 10 yr per annum | 3.6% | 0.8% | 2.4% | -0.4% |
| 10 yr total | 42.4% | 8.1% | 26.9% | -3.6% |
| 5 yr per annum | 2.6% | -1.5% | 1.2% | -2.7% |
| 5 yr total | 13.6% | -7.1% | 6.3% | -13.0% |
| 1 yr per annum | -0.5% | -4.5% | -6.6% | -10.3% |
| 1 yr total | -0.5% | -4.5% | -6.6% | -10.3% |
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, HP area have seen a 0.8% annual change when adjusted for inflation. This translates to a total change of 17.7% in real terms.
- Over the past 5 years, HP area have seen a -1.5% annual change when adjusted for inflation. This translates to a total change of -7.1% in real terms.
Most recent HP8 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 |
|---|---|---|---|
| Deanway, , HP8 4J | 129 sqm | £5,480 | 14 |
| Burtons Lane, , HP8 4B | 272 sqm | £6,461 | 12 |
| Vache Lane, , HP8 4S | 198 sqm | £5,478 | 12 |
| Palliser Road, , HP8 4D | 91 sqm | £6,420 | 12 |
| Kings Road, , HP8 4H | 167 sqm | £5,903 | 11 |
| Bottrells Lane, , HP8 4E | 164 sqm | £6,597 | 11 |
| Birkett Way, , HP8 4B | 133 sqm | £6,927 | 10 |
| White Hart Close, , HP8 4P | 117 sqm | £5,823 | 10 |
Search for your street here.
Nearby geographies
The table below shows how 'HP8' compares to the other postcode districts nearby 'HP8'.
| District | Lower quartile | Median | Upper quartile | Sales in last 2yr |
|---|---|---|---|---|
| WD3 Croxley Green | £5,440 sqm | £6,310 sqm | £7,110 sqm | 806 |
| SL9 Chalfont St Peter | £5,400 sqm | £6,180 sqm | £7,140 sqm | 439 |
| HP9 Beaconsfield | £6,140 sqm | £6,960 sqm | £7,640 sqm | 413 |
| HP8 Chalfont St Giles | £5,470 sqm | £6,210 sqm | £7,010 sqm | 106 |
| HP7 Amersham | £5,530 sqm | £6,310 sqm | £7,370 sqm | 204 |
| HP6 Amersham | £5,640 sqm | £6,470 sqm | £7,250 sqm | 300 |
| HP5 Chesham | £4,540 sqm | £5,130 sqm | £5,940 sqm | 551 |
| HP4 Berkhamsted | £5,500 sqm | £6,410 sqm | £7,500 sqm | 607 |
| HP3 Hemel Hempstead | £4,300 sqm | £4,870 sqm | £5,520 sqm | 633 |
| HP27 Princes Risborough | £4,680 sqm | £5,210 sqm | £6,010 sqm | 314 |
Raw data
Our analysis of HP8 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 |
|---|---|---|---|
| 10, Captain Cook Close, | £500,000
Oct-2024
|
106 | 4,716 |
| Claytiles, Three Households, | £695,000
Sep-2024
|
138 | 5,036 |
| 19, Lapraik Grove, | £260,000
Sep-2024
|
81 | 3,209 |
See the entire list of all sales in HP8 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.