Feb 07, 2023 by HM

House prices in Llanrumney (CF3 4)

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

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. 80, Kennerleigh Road, Llanrumney, St Mellons, sold for £70,000 on Sep-2023. Given the internal area of 74 square metres, the price per sqm is £945.

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

Distribution of £ per sqm for Llanrumney (CF3 4)
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.

That said, the spread of prices will give you a feel of the typical range to expect in Llanrumney (CF3 4). Of the 113 transactions, half were sold for between £1,990 and £2,810 per square metre. Notably, only 25% of properties that sold recently were valued at more than £2,810m2. For anything to be valued more than this means it has to be more desireable than the clear majority of homes.

For the average, we calculate the 'median' or middle price. The median price per square metre in 'CF3 4' is £2,440. The table below shows how 'CF3 4' compares to neighbouring postcode sectors.

Postcode sector Lower quartile Middle quartile Upper quartile
CF3 3 Rumney £2,310m2 £2,650m2 £3,240m2
CF3 1 St Mellons £1,890m2 £2,180m2 £2,540m2
CF3 2 Marshfield £2,780m2 £3,360m2 £3,890m2
CF3 5 Llanrumney £2,220m2 £2,530m2 £2,800m2
CF3 6 Old St Mellons £3,190m2 £3,620m2 £3,920m2
CF3 0 St Mellons £2,630m2 £3,110m2 £3,390m2
CF3 4 Llanrumney £1,990m2 £2,440m2 £2,810m2

Will Llanrumney 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 4 (Llanrumney). 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 4 and the blue dots are the individual property sales that inform this trend.

Price per square metre in Llanrumney (CF3 4) over time
House price trends for Llanrumney

Hover on any blue dot to see details of specific sales

Disclaimer: The data provided throughout this website about Llanrumney 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 Llanrumney data or any other data I am given.

Price map for Llanrumney

I've just finished coding the map I link to below. I find it useful and I am sure it will help you in exploring Llanrumney. 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. I will explain more about the methodology and create a key next week.

Property price heatmap for Llanrumney
House price heatmap for Llanrumney

Street level data

Street Avg size Avg £/m2 Recent sales
Ridgeway Road, Llanrumney, CF3 4A 84m2 £2,239 30
Kennerleigh Road, Llanrumney, CF3 4B 68m2 £1,809 17
Newport Road, Llanrumney, CF3 4F 104m2 £2,584 16
Bideford Road, Llanrumney, CF3 4E 84m2 £2,434 11
Llanrumney Avenue, Llanrumney, CF3 4D 89m2 £2,255 11
Ball Road, Llanrumney, CF3 4J 85m2 £1,888 11
Cranleigh Rise, Llanrumney, CF3 4A 61m2 £1,792 9
Ball Road, Llanrumney, CF3 4B 91m2 £2,685 9

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 m2 £/m2
80, Kennerleigh Rd, Llanrumney, St Mellons £70,000
74 945
14, Hartland Rd, Llanrumney, St Mellons £247,000
93 2,655
20, Mendip Rd, Llanrumney, St Mellons £290,000
125 2,320

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