House prices in CF3 3 (Rumney)

This article reveals price per square metre data and various charts to help you understand current housing market in Rumney, St Mellons (CF3 3).

Defining 'CF3 3'

This analysis is limited to properties whose postcode starts with "CF3 3", 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 Rumney.

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 Rumney 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. 12, Witla Court Road, Rumney, St Mellons, sold for £215,000 on Apr-2024. Given the internal area of 76 square metres, the price per sqm is £2,828.

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. £2,350-£2,500, £2,500-£2,650, £2,650-£2,800 etc...) we then count the number of sales with within in each bucket and plot the results. The chart is based on 113 sales in Rumney (CF3 3) that took place in the last two years.

Distribution of £ per sqm for Rumney, St Mellons
Distribution of £ per sqm house prices in Rumney

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 Rumney (CF3 3). Of the 113 transactions, half were sold for between £2,320 and £3,280 per square metre. The median, or 'middle', price per square metre in 'CF3 3' is £2,760. Notably, only 25% of properties that sold recently were valued at more than £3,280 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 Rumney, 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 Rumney
House price heatmap for Rumney, St Mellons

Comparison with neighbouring postcode sectors

The table below shows how 'CF3 3' compares to neighbouring postcode sectors.

Postcode sector Lower quartile Middle quartile Upper quartile
CF3 2 Marshfield £2,820 sqm £3,390 sqm £3,920 sqm
CF3 5 Llanrumney £2,210 sqm £2,500 sqm £2,810 sqm
CF3 6 Old St Mellons £3,200 sqm £3,710 sqm £4,010 sqm
CF3 3 Rumney £2,320 sqm £2,760 sqm £3,280 sqm
CF3 0 St Mellons £2,640 sqm £3,130 sqm £3,440 sqm
CF3 4 Llanrumney £1,990 sqm £2,360 sqm £2,750 sqm
CF3 1 Rumney £2,010 sqm £2,220 sqm £2,610 sqm

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 chart below for CF3 3 (Rumney) compared with both the wider area CF3 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 Rumney,St Mellons
House price trends for Rumney

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 CF3 3 sales
Recent trends for Rumney

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 St Mellons 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 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.

Street level data

Street Avg size Avg £sqm Recent sales
Greenway Road, Rumney, CF3 3A 44 sqm £2,410 13
Wentloog Close, Rumney, CF3 3H 68 sqm £2,376 13
New Road, Rumney, CF3 3A 105 sqm £2,719 11
Wentloog Road, Rumney, CF3 3E 70 sqm £2,343 11
Quarry Dale, Rumney, CF3 3B 87 sqm £2,744 11
Greenway Road, Rumney, CF3 3P 88 sqm £2,166 11
New Road, Rumney, CF3 3B 80 sqm £2,194 10
Ty Fry Road, Rumney, CF3 3J 103 sqm £2,822 10

Search for your street here.

Raw data

Our analysis of Rumney 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
12, Witla Court Rd, Rumney, St Mellons £215,000
76 2,828
10, Rhossilli Avenue, Rumney, St Mellons £147,000
93 1,580
38, Ty Fry Rd, Rumney, St Mellons £170,000
103 1,650

See the entire list of all sales in Rumney (CF3 3) 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.