House prices in AL8 (Welwyn Garden City)
This article shows price per square metre data and various charts to help you understand the housing market in AL8 - stats were last calculated on 01 November 2024.
Defining 'AL8'
This analysis is limited to properties whose postcode starts with "AL8", this is also called the postcode district. There are no official postcode district names so I've just labelled it AL8, Welwyn Garden City. 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 AL8 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 September 2024, 332, Knightsfield, Welwyn Garden City, AL8 7NQ sold for £770,000. Given the internal area of 152 square metres recorded on the EPC, the price per sqm is £770,000 ÷ 152 sqm = £5,065.
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 AL8 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 AL8
The chart above is called a histogram, it helps you see the distribution of house price per sqm in AL8 To make this chart we put all the sales data into a series of £ per sqm 'buckets' (e.g. £5,800 to £6,000, £6,000 to £6,200, £6,200 to £6,400 etc...) we then count the number of sales with within in each bucket and plot the results. The histogram is based on 242 sales that took place in AL8, 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 AL8, Welwyn Garden City. Notably, only 25% of properties that sold recently were valued at more than £6,690 sqm. For anything to be valued more than this means it has to be more desireable than the clear majority of AL8 homes.
Box plot of £ per sqm for AL8
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. Welwyn Garden City. The chart above shows a boxplot for 'AL8' as well as the 'AL' postcode area.
Property price map for Welwyn Garden City
Have a look at the interactive price map I created for myself. Use it to explore 'AL8' house prices all the way down to individual property plots.
House price map for Welwyn Garden CityWill AL8 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 AL8 (Welwyn Garden City) compared with the wider postcode area 'AL'. You can extrapolate from this based on your own views on future interest rates, inflation and other factors.
House price index for AL8
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 'AL8' property prices over the last 20 years. The index is calculated from the average price paid per sqm for property in AL8 and is set to 100 in 2004. The chart compares trends for AL8, Welwyn Garden City against those of the broader postcode area 'AL'. 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 Welwyn Hatfield 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 AL8
| AL area | AL8 district | |||
|---|---|---|---|---|
| Nominal | Real | Nominal | Real | |
| 20 yr per annum | 4.0% | 1.3% | 3.8% | 1.1% |
| 20 yr total | 117.2% | 28.6% | 110.4% | 24.6% |
| 10 yr per annum | 3.5% | 0.7% | 3.1% | 0.3% |
| 10 yr total | 41.5% | 7.4% | 35.8% | 3.1% |
| 5 yr per annum | 2.6% | -1.5% | 1.9% | -2.1% |
| 5 yr total | 13.5% | -7.1% | 10.0% | -10.0% |
| 1 yr per annum | -1.6% | -5.5% | -2.7% | -6.5% |
| 1 yr total | -1.6% | -5.5% | -2.7% | -6.5% |
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, AL8 district have seen a 1.1% annual change when adjusted for inflation. This translates to a total change of 24.6% in real terms.
- Over the past 5 years, AL8 district have seen a -2.1% annual change when adjusted for inflation. This translates to a total change of -10.0% in real terms.
Most recent AL8 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 |
|---|---|---|---|
| College Way, , AL8 6D | 64 sqm | £5,532 | 20 |
| Barnside Court, , AL8 6T | 53 sqm | £4,707 | 14 |
| Handside Lane, , AL8 6T | 90 sqm | £6,285 | 12 |
| Haymeads, , AL8 7A | 70 sqm | £4,087 | 12 |
| Attimore Road, , AL8 6L | 130 sqm | £6,422 | 12 |
| Lemsford Lane, , AL8 6Y | 84 sqm | £5,415 | 11 |
| Longcroft Lane, , AL8 6E | 81 sqm | £6,310 | 11 |
| Great North Road, , AL8 7T | 90 sqm | £5,137 | 11 |
Search for your street here.
Nearby geographies
The table below shows how 'AL8' compares to the other postcode districts nearby 'AL8'.
| District | Lower quartile | Median | Upper quartile | Sales in last 2yr |
|---|---|---|---|---|
| AL9 Brookmans Park | £4,720 sqm | £5,520 sqm | £6,600 sqm | 226 |
| AL8 Welwyn Garden City | £5,070 sqm | £5,770 sqm | £6,690 sqm | 242 |
| AL7 Welwyn Garden City | £4,290 sqm | £4,800 sqm | £5,490 sqm | 638 |
| AL6 Welwyn | £4,700 sqm | £5,380 sqm | £5,980 sqm | 229 |
| AL5 Harpenden | £5,880 sqm | £6,920 sqm | £7,920 sqm | 750 |
| AL4 St Albans | £5,600 sqm | £6,540 sqm | £7,430 sqm | 625 |
| AL3 St Albans | £5,380 sqm | £6,360 sqm | £7,860 sqm | 618 |
| AL2 London Colney | £4,790 sqm | £5,680 sqm | £6,580 sqm | 432 |
| AL10 Hatfield | £3,980 sqm | £4,470 sqm | £5,050 sqm | 436 |
| AL1 St Albans | £5,760 sqm | £6,790 sqm | £7,900 sqm | 1,028 |
Raw data
Our analysis of AL8 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 |
|---|---|---|---|
| 332, Knightsfield, | £770,000
Sep-2024
|
152 | 5,065 |
| 6, Tilecroft, | £395,000
Aug-2024
|
71 | 5,563 |
| 103, Handside Lane, | £840,000
Aug-2024
|
126 | 6,666 |
See the entire list of all sales in AL8 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.