House prices in AL9 7 (Welham Green)

This article reveals price per square metre data and various charts to help you understand current housing market in Welham Green, Brookmans Park (AL9 7).

Defining 'AL9 7'

This analysis is limited to properties whose postcode starts with "AL9 7", this is also called the postcode sector. It is shown in red on the map above. There are no official names for postcode sectors so I've just labelled it Welham Green.

You can click on the map labels to change to a neighbouring sector, or you can enter a different postcode sector (e.g. CM23 4) below.

FYI, a postcode sector is the full postcode without the last two letters.

Price per square metre

Knowing the average house price in Welham Green 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
E.g. 25, Alderman Close, Welham Green, Brookmans Park, sold for £560,000 on Feb-2024. Given the internal area of 77 square metres, the price per sqm is £7,272.

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 ;-) They may want to convert square meters on this page to square feet.

The chart below is called a histogram, it helps you see the distribution of this house price per sqm data. To make this chart we put the sales data into a series of £ per sqm 'buckets' (e.g. £6,700-£7,000, £7,000-£7,300, £7,300-£7,600 etc...) we then count the number of sales with within in each bucket and plot the results. The chart is based on 106 sales in Welham Green (AL9 7) that took place in the last two years.

Distribution of £ per sqm for Welham Green, Brookmans Park
Distribution of £ per sqm house prices in Welham Green

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 Welham Green (AL9 7). Of the 106 transactions, half were sold for between £5,090 and £7,250 per square metre. The median, or 'middle', price per square metre in 'AL9 7' is £6,120. Notably, only 25% of properties that sold recently were valued at more than £7,250 sqm. For anything to be valued more than this means it has to be more desireable than the clear majority of homes.

Price map for Welham Green, Brookmans Park

Do have a look at the interactive price map I created. I find it useful and I am sure it will help you in exploring Brookmans Park. You can zoom in all the way to individual properties and then all the way back out to see the whole country. The colours show the current estimated property values.

Property price heatmap for Welham Green
House price heatmap for Welham Green, Brookmans Park

Comparison with neighbouring postcode sectors

The table below shows how 'AL9 7' compares to neighbouring postcode sectors.

Postcode sector Lower quartile Middle quartile Upper quartile
AL9 5 Hatfield £4,130 sqm £4,570 sqm £5,220 sqm
AL9 7 Welham Green £5,090 sqm £6,120 sqm £7,250 sqm
AL9 6 Essendon £5,170 sqm £6,250 sqm £6,900 sqm

Will Brookmans Park house prices drop in 2024?

I cannot tell the future and don't believe anyone who says they can. I can however plot price trends - I have done this in the chart below for AL9 7 (Welham Green) compared with both the wider area AL9 and inflation (CPIH from the Office of National Statistics). The dashed trend lines in the chart show the average over time.

Historic price per square metre in Welham Green,Brookmans Park
House price trends for Welham Green

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.

Most recent AL9 7 sales
Recent trends for Welham Green

Data from Land Registry comes in gradually over time. I update it every month but it takes about 5 months for the majority of sales for Brookmans Park to be recorded. Disclaimer: I do not verify and cannot guarantee the accuracy of any data shown. Outliers exist in the data, typically these are where the EPC registry records the internal area incorrectly, sometimes although very rarely the Land Registry price paid data can be wrong. The data provided throughout this website about Brookmans Park and any other area, is not financial advice. Any information provided does not and cannot ever take in to account the particular financial situation, objectives or property needs of either you or anyone reading this information.

Street level data

Street Avg size Avg £sqm Recent sales
Georges Wood Road, Welham Green, AL9 7B 179 sqm £6,726 21
Brookmans Avenue, Welham Green, AL9 7Q 282 sqm £8,217 18
Moffats Lane, Welham Green, AL9 7R 173 sqm £6,905 15
Bluebridge Road, Welham Green, AL9 7U 118 sqm £6,424 14
Westland Drive, Welham Green, AL9 7U 104 sqm £6,575 11
Mymms Drive, Welham Green, AL9 7A 258 sqm £7,304 11
Somers Road, Welham Green, AL9 7P 91 sqm £4,567 11
Holloways Lane, Welham Green, AL9 7N 116 sqm £5,573 9

Search for your street here.

Raw data

Our analysis of Welham Green 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
25, Alderman Close, Welham Green, Brookmans Park £560,000
77 7,272
24, Mymms Drive, Welham Green, Brookmans Park £1,350,000
248 5,443
106, Vincenzo Close, Welham Green, Brookmans Park £380,000
55 6,909

See the entire list of all sales in Welham Green (AL9 7) here.


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.