House prices in SA4 (Gorseinon)

This article shows price per square metre data and various charts to help you understand the housing market in SA4 - stats were last calculated on 01 November 2024.

Defining 'SA4'

This analysis is limited to properties whose postcode starts with "SA4", this is also called the postcode district. There are no official postcode district names so I've just labelled it SA4, Gorseinon. It is shown in red on the map below.

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You can click on the map above to change to a neighbouring district, or you can use the search form below.

Price per square metre

Knowing the average house price in SA4 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

For example in September 2024, 17, Parkwood, Gorseinon, SA4 3DQ sold for £227,000. Given the internal area of 75 square metres recorded on the EPC, the price per sqm is £227,000 ÷ 75 sqm = £3,026.

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 ;-). It is a huge pain to code the automatic conversion for square meters to square feet for all the graphs and charts on SA4 and elsewhere. All the conditionals turn my tidy code for into spaghetti. I will get around to it at some point, but for now you can just divide everything by 10 in your head, move a decimal place and you'll be close enough. If you want to be more precise 1 sqm = 10.76391 sqft.

Distribution of £ per sqm for houses vs flats in SA4

The chart above is called a histogram, it helps you see the distribution of house price per sqm in SA4 To make this chart we put all the sales data into a series of £ per sqm 'buckets' (e.g. £2,350 to £2,500, £2,500 to £2,650, £2,650 to £2,800 etc...) we then count the number of sales with within in each bucket and plot the results. The histogram is based on 1,103 sales that took place in SA4, in the last 24 months.

Generate a custom histogram like the one above but based on your own criteria.

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 SA4, Gorseinon. Notably, only 25% of properties that sold recently were valued at more than £2,680 sqm. For anything to be valued more than this means it has to be more desireable than the clear majority of SA4 homes.

Box plot of £ per sqm for SA4

Tip: click on the chart to see the values.

The chart above is called a boxplot (or a box-and-whisker plot). Box plots, like histograms, are used to graphically represent the distribution of data, showing the central tendency, spread of the distribution. In the context of £ per square metre property price distributions, box plots represent the variation in property prices within a geographic area e.g. Gorseinon. The chart above shows a boxplot for 'SA4' as well as the 'SA' postcode area.

  • Median: The horizontal line inside the box represents the median (£ per square meter). This is the midpoint of the data, meaning 50% of the prices are below this value, and 50% are above. The middle price per square metre in 'SA4' is £2,220.
  • Interquartile Range (IQR): The box spans from the 25th percentile (Q1) to the 75th percentile (Q3). This is the range where the middle 50% of the data lies, giving a good indication of the typical price spread. Of the 1,103 transactions in SA4, Gorseinon half were sold for between £1,740 and £2,680 per square metre.
  • Whiskers: In our case, the whiskers extend from the 9th percentile (at the lower end) to the 91st percentile (at the upper end), This provides a slightly broader view of the distribution by including the middle 82% of records. The whiskers capture most of the variation but exclude extreme outliers caused by data errors in recording sold house prices or internal area.
  • 'n=' is the number of property transactions the box plot is based on; 1,103 for SA4, Gorseinon.

    • Property price map for Gorseinon

    Have a look at the interactive price map I created for myself. Use it to explore 'SA4' house prices all the way down to individual property plots.

    Property price heatmap for Gorseinon
    House price map for Gorseinon

    Will SA4 house prices drop in 2025?

    I cannot tell what house prices will do in the future and don't believe anyone who says they can. However we can plot price trends, I have done this in the chart below for SA4 (Gorseinon) compared with the wider postcode area 'SA'. You can extrapolate from this based on your own views on future interest rates, inflation and other factors.

    House price index for SA4

    Tip: click on the legend items to show/hide different lines

    Download house price index as CSV (premium users only).

    The chart above shows changes in 'SA4' property prices over the last 20 years. The index is calculated from the average price paid per sqm for property in SA4 and is set to 100 in 2004. The chart compares trends for SA4, Gorseinon against those of the broader postcode area 'SA'. What is more interesting is to look at the difference between flats and houses, even those in the same area follow a very different trend, to get a robust enough sample size to see this we need to zoom out and look at house price trends for the entire Swansea local authority.

    The dashed lines show nominal house price changes, the solid lines show the same data adjusted for inflation. Economists call this the 'real' price change. You have to take inflation into account when comparing prices over time. It's calculated using the formula:

    Real Rate of Return = (1 + Nominal Rate) ÷ (1 + Inflation Rate) – 1
    In this formula, the nominal rate is the rate of change before any adjustments, and the inflation rate is taken from the Consumer Price Index. The real rate of return is a more accurate measure of change in value, because £1 today does not have the same buying power as £1 in the past. For example, if a savings account pays an interest rate of 3% per year and the inflation rate is 5% per year, the real rate of return is -2%. This means that the investment's value is shrinking by 2% each year.

    Historic returns for SA4
    SA area SA4 district
    Nominal Real Nominal Real
    20 yr per annum 3.1% 0.4% 3.0% 0.3%
    20 yr total 83.6% 8.7% 79.9% 6.5%
    10 yr per annum 4.0% 1.2% 4.5% 1.7%
    10 yr total 48.3% 12.6% 56.0% 18.5%
    5 yr per annum 5.1% 1.0% 6.1% 1.9%
    5 yr total 28.1% 4.9% 34.3% 9.9%
    1 yr per annum -0.7% -4.6% 2.6% -1.5%
    1 yr total -0.7% -4.6% 2.6% -1.5%

    This table complements the house price index chart above, presenting the data in a more detailed format. It breaks down the information into 20-year, 10-year, 5-year, and 1-year periods, further categorized by property type. For each period, we display both a per annum rate of change and a total rate of change.

    The total rate of change represents the overall change over the entire period. The formula for total return is:

    Total return = (Index at end of period ÷ Index at start of period) - 1

    The per annum rate of change is the annualized rate of change over the period. This is equivalent to the annual bank savings rate you would need to achieve the same total return over the given period. This annualized return is also known as the Compound Annual Growth Rate (CAGR). The formula for CAGR is:

    CAGR = (1 + Total return) ^ (1 ÷ Number of years) - 1

    Some specific examples:

    • Over the past 20 years, SA area have seen a 0.4% annual change when adjusted for inflation. This translates to a total change of 8.7% in real terms.
    • Over the past 5 years, SA4 district have seen a 1.9% annual change when adjusted for inflation. This translates to a total change of 9.9% in real terms.

    Most recent SA4 sales

    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.

    Tip: hover over dots to see details

    Street level data

    Street Avg size Avg £sqm Recent sales
    Alexandra Road, , SA4 4N 73 sqm £1,809 34
    Borough Road, , SA4 6R 106 sqm £1,917 26
    Llwyngwern, , SA4 0A 78 sqm £2,268 24
    Frampton Road, , SA4 4Y 92 sqm £1,917 23
    West Street, , SA4 4A 99 sqm £1,482 22
    Belgrave Road, , SA4 6R 117 sqm £1,967 22
    Six Mills Avenue, , SA4 4Q 78 sqm £1,887 22
    Bronallt Road, , SA4 0U 145 sqm £1,768 21

    Search for your street here.

    Nearby geographies

    The table below shows how 'SA4' compares to the other postcode districts nearby 'SA4'.

    District Lower quartile Median Upper quartile Sales in last 2yr
    SA9 Ystradgynlais £1,360 sqm £1,770 sqm £2,280 sqm 351
    SA8 Pontardawe £1,630 sqm £2,090 sqm £2,560 sqm 255
    SA73 Neyland £1,460 sqm £1,840 sqm £2,370 sqm 531
    SA72 Pembroke Dock £1,110 sqm £1,480 sqm £1,920 sqm 273
    SA71 Pembroke £1,830 sqm £2,270 sqm £2,770 sqm 227
    SA70 Tenby £2,490 sqm £3,030 sqm £3,630 sqm 270
    SA7 Birchgrove £1,840 sqm £2,270 sqm £2,580 sqm 312
    SA69 Saundersfoot £2,710 sqm £3,450 sqm £4,260 sqm 120
    SA68 Kilgetty £2,480 sqm £2,910 sqm £3,380 sqm 112
    SA67 Narberth £2,070 sqm £2,560 sqm £3,200 sqm 187

    Raw data

    Our analysis of SA4 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
    17, Parkwood, £227,000
    Sep-2024
    		 75 3,026
    28, Brynamlwg Rd, £156,000
    Sep-2024
    		 79 1,974
    16, Heol Y Llan, £170,000
    Sep-2024
    		 87 1,954

    See the entire list of all sales in SA4 here.

    About

    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.