House prices in CF3 4 (Llanrumney)

This article reveals price per square metre data and various charts to help you understand current housing market in Llanrumney, St Mellons (CF3 4).

Defining 'CF3 4'

This analysis is limited to properties whose postcode starts with "CF3 4", 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 Llanrumney.

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 Llanrumney 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. Flat 12 Sutherland Court, Cranleigh Rise, Llanrumney, St Mellons, sold for £62,500 on Feb-2024. Given the internal area of 59 square metres, the price per sqm is £1,059.

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 110 sales in Llanrumney (CF3 4) that took place in the last two years.

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

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 Llanrumney (CF3 4). Of the 110 transactions, half were sold for between £1,930 and £2,770 per square metre. The median, or 'middle', price per square metre in 'CF3 4' is £2,330. Notably, only 25% of properties that sold recently were valued at more than £2,770 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 Llanrumney, 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 Llanrumney
House price heatmap for Llanrumney, St Mellons

Comparison with neighbouring postcode sectors

The table below shows how 'CF3 4' compares to neighbouring postcode sectors.

Postcode sector Lower quartile Middle quartile Upper quartile
CF3 2 Marshfield £2,860 sqm £3,400 sqm £3,910 sqm
CF3 5 Llanrumney £2,220 sqm £2,520 sqm £2,770 sqm
CF3 6 Old St Mellons £3,200 sqm £3,730 sqm £4,010 sqm
CF3 3 Rumney £2,310 sqm £2,760 sqm £3,290 sqm
CF3 1 Rumney £2,020 sqm £2,240 sqm £2,620 sqm
CF3 0 St Mellons £2,630 sqm £3,140 sqm £3,440 sqm
CF3 4 Llanrumney £1,930 sqm £2,330 sqm £2,770 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 4 (Llanrumney) 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 Llanrumney,St Mellons
House price trends for Llanrumney

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 4 sales
Recent trends for Llanrumney

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
Ridgeway Road, Llanrumney, CF3 4A 84 sqm £2,241 30
Kennerleigh Road, Llanrumney, CF3 4B 68 sqm £1,822 17
Newport Road, Llanrumney, CF3 4F 104 sqm £2,475 15
Cranleigh Rise, Llanrumney, CF3 4A 62 sqm £1,831 13
Bideford Road, Llanrumney, CF3 4E 84 sqm £2,458 12
Lynmouth Crescent, Llanrumney, CF3 4A 65 sqm £1,574 10
Chulmleigh Close, Llanrumney, CF3 4B 73 sqm £1,706 8
Ball Road, Llanrumney, CF3 4B 91 sqm £2,758 8

Search for your street here.

Raw data

Our analysis of Llanrumney 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
Flat 12 Sutherland Court, Cranleigh Rise, Llanrumney, St Mellons £62,500
59 1,059
44, Woolacombe Avenue, Llanrumney, St Mellons £210,000
83 2,530
Flat 16 Sutherland Court, Cranleigh Rise, Llanrumney, St Mellons £112,000
58 1,931

See the entire list of all sales in Llanrumney (CF3 4) 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.