Feb 07, 2023 by HM

House prices in St Mellons (CF3 0)

This article reveals price per square metre data and various charts to help you understand current housing market in St Mellons (CF3 0).

Defining 'CF3 0'

This analysis is limited to properties whose postcode starts with "CF3 0", this is also called the postcode sector. It is shown in red on the map above. You can click on the map labels to change to a neighbouring sector.

Price per square metre

Knowing the average house price in St Mellons 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. 67, Sanderling Drive, St Mellons, sold for £185,000 on Feb-2024. Given the internal area of 55 square metres, the price per sqm is £3,363.

England & Wales have been officially metric for many decades. However house price per square foot is sometimes prefered by those of sufficiently advanced age. ;-) They may want to convert metres 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. £3,350-£3,500, £3,500-£3,650, £3,650-£3,800 etc...) we then count the number of sales with within in each bucket and plot the results. The chart is based on 222 sales in St Mellons (CF3 0) that took place in the last two years.

Distribution of £ per sqm for St Mellons (CF3 0)
Distribution of £ per sqm house prices in St Mellons

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 St Mellons (CF3 0). Of the 222 transactions, half were sold for between £2,630 and £3,440 per square metre. The median, or 'middle', price per square metre in 'CF3 0' is £3,140. Notably, only 25% of properties that sold recently were valued at more than £3,440m2. For anything to be valued more than this means it has to be more desireable than the clear majority of homes.

Price map for St Mellons

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 St Mellons. 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 St Mellons
House price heatmap for St Mellons

Comparison with neighbouring postcode sectors

The table below shows how 'CF3 0' compares to neighbouring postcode sectors.

Postcode sector Lower quartile Middle quartile Upper quartile
CF3 2 Marshfield £2,900m2 £3,450m2 £3,910m2
CF3 5 Llanrumney £2,240m2 £2,550m2 £2,850m2
CF3 6 Old St Mellons £3,210m2 £3,730m2 £3,990m2
CF3 3 Rumney £2,350m2 £2,780m2 £3,290m2
CF3 0 St Mellons £2,630m2 £3,140m2 £3,440m2
CF3 4 Llanrumney £1,930m2 £2,340m2 £2,780m2
CF3 1 St Mellons £2,040m2 £2,240m2 £2,580m2

Will St Mellons 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 scatter plot below for CF3 0 (St Mellons). From this one could infer a range of reasonable possible future price falls or rises. In the chart below, the red dashed line is the house price trend for CF3 0 and the blue dots are the individual property sales that inform this trend.

Price per square metre in St Mellons (CF3 0) over time
House price trends for St Mellons

Hover on any blue dot to see details of specific sales

Disclaimer: The data provided throughout this website about St Mellons 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. Furthermore, I cannot guarantee the accuracy of any data shown. This information is based on sold prices and internal area data provided by Land Registry and other third parties - I do not verify the accuracy of the St Mellons data or any other data I am given.

Street level data

Street Avg size Avg £/m2 Recent sales
Heritage Park, St Mellons, CF3 0D 63m2 £2,875 31
Willowbrook Gardens, St Mellons, CF3 0B 82m2 £2,592 28
Matthysens Way, St Mellons, CF3 0P 81m2 £2,928 22
Spencer David Way, St Mellons, CF3 0Q 95m2 £2,480 21
Sanderling Drive, St Mellons, CF3 0D 76m2 £2,982 16
Rhodfa Crughywel, St Mellons, CF3 0F 76m2 £2,519 12
Brython Drive, St Mellons, CF3 0L 70m2 £2,996 12
Orchard Park, St Mellons, CF3 0A 63m2 £2,777 12

Search for your street here.

New build activity

Street Avg size Avg £/m2 New build sales
Willowbrook Street, St Mellons, CF3 0F 91m2 £2,590 12

Willowbrook Street, St Mellons, CF3 0F has seen 12 new build sales in the last 4 years (average price £226,068). These new build homes typically have an internal area of 91 m2, with an average price of £2,590 m2. This £sqm average is £-550 below the average for CF3 0. New builds typically command a £ per sqm premium. In the case of Willowbrook Street the premium seems not to exist. Without more info we can only speculate why this may be. Perhaps it may be greater density and smaller gardens, but this is just a guess.

Raw data

Our analysis of St Mellons 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 m2 £/m2
67, Sanderling Drive, St Mellons £185,000
55 3,363
18, Jenkins Way, St Mellons £235,000
71 3,309
51, Harrison Drive, St Mellons £228,000
70 3,257

See the entire list of all sales in St Mellons (CF3 0) here.


HouseMetric is a hobby, created out of a desire to see data and analysis not present on any free to use website. It is still a work in progress and I'll add more stuff in the near future.