House prices in 'NG31 8', Grantham

Price per square metre data and charts revealed. Latest statistics for the housing market in 'NG31 8' (Grantham) - calculated on 04 February 2026.

Defining 'NG31 8'

This analysis is limited to properties whose postcode starts with "NG31 8", this is also called the postcode sector. There are no official postcode sector names so I've just labelled it NG31 8, Grantham. 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 sector, or you can use the search form below.

Price per square metre

Knowing the average house price in NG31 8 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 December 2025, 32, Grampian Way, Grantham, NG31 8FY sold for £425,000. Given the internal area of 147 square metres recorded on the EPC, the price per sqm is £425,000 ÷ 147 sqm = £2,891.

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 ;-). You can change your prefered units from square meters to square feet for all the graphs and charts on NG31 8 and elsewhere. Just visit the My Account page and look for the m2 to ft2 toggle switch. Alternatively just multiply everything by 10, move a decimal place to go from sqm to sqft and you'll be close enough as 1 sqm = 10.76391 sqft.

Distribution of £ per sqm for 'NG31 8' vs 'NG31'

The chart above is called a histogram, it helps you see the distribution of house price per sqm in NG31 8 To make this chart we put all the sales data into a series of £ per sqm 'buckets' (e.g. £2,900 to £3,000, £3,000 to £3,100, £3,100 to £3,200 etc...) we then count the number of sales with within in each bucket and plot the results. The histogram is based on 533 sales that took place in NG31 8, Grantham 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 NG31 8, Grantham. Notably, only 25% of properties that sold recently were valued at more than £3,040 sqm. For anything to be valued more than this means it has to be more desireable than the clear majority of NG31 8 homes.

Box plot of £ per sqm for NG31 8

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. Grantham. The chart above shows a boxplot for 'NG31 8' as well as the 'NG31' postcode district.

  • 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 'NG31 8' is £2,700.
  • 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 533 transactions in NG31 8, Grantham half were sold for between £2,260 and £3,040 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; 533 for NG31 8, Grantham.

    • Property price map for Grantham

    Have a look at the interactive price map I created for myself. Use it to explore 'NG31 8' house prices all the way down to individual property plots.

    Property price heatmap for Grantham
    House price map for Grantham

    Grantham house price forecasting

    House prices in NG31 8 grew 1.3% in the last year, -2.5% after inflation. Whether or not this trend will continue depends on many factors, such as wage growth, net migration, interest rates and the level of house building. No one can predict these things with certainty however we can plot the historic trends in house prices in NG31 8 (Grantham) compared with the wider postcode district of NG31.

    House price index for NG31 8

    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 'NG31 8' property prices over the last 20 years. The index is calculated from the average price paid per sqm for property in NG31 8 and is set to 100 in 2004. I'm comparing the trends for NG31 8,Grantham with the wider postcode district of NG31 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 South Kesteven 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 NG31 8
    NG31 8 sector NG31 district
    Nominal Real Nominal Real
    20 yr per annum 2.7% -0.1% 2.6% -0.1%
    20 yr total 69.9% -1.6% 68.1% -2.6%
    10 yr per annum 3.9% 0.7% 4.1% 0.9%
    10 yr total 46.2% 7.4% 49.1% 9.5%
    5 yr per annum 4.3% -0.2% 4.8% 0.2%
    5 yr total 23.7% -0.8% 26.2% 1.1%
    1 yr per annum 1.3% -2.5% 2.6% -1.3%
    1 yr total 1.3% -2.5% 2.6% -1.3%

    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, NG31 8 sector have seen a -0.1% annual change when adjusted for inflation. This translates to a total change of -1.6% in real terms.
    • Over the past 5 years, NG31 district have seen a 0.2% annual change when adjusted for inflation. This translates to a total change of 1.1% in real terms.

    Most recent NG31 8 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
    Premier Court, Grantham, NG31 8F 57 sqm £1,815 20
    Manthorpe Road, Grantham, NG31 8D 152 sqm £2,597 19
    Barrowby Road, Grantham, NG31 8A 169 sqm £2,336 17
    Long Street, Grantham, NG31 8L 105 sqm £2,450 15
    Belvoir Gardens, Grantham, NG31 8L 93 sqm £2,859 15
    Winchester Road, Grantham, NG31 8A 97 sqm £3,310 14
    Sandcliffe Road, Grantham, NG31 8E 83 sqm £3,085 14
    Manchester Way, Grantham, NG31 8R 79 sqm £3,031 14

    Search for your street here.

    Nearby geographies

    The table below shows how 'NG31 8' compares to the other postcode sectors in NG31.

    Sector Lower quartile Median Upper quartile Sales in last 2yr
    NG32 2 Foston £2,420 sqm £2,790 sqm £3,100 sqm 75
    NG32 1 Barrowby £2,630 sqm £2,960 sqm £3,390 sqm 88
    NG31 9 Grantham £2,100 sqm £2,510 sqm £2,850 sqm 336
    NG31 8 Grantham £2,260 sqm £2,700 sqm £3,040 sqm 533
    NG31 7 Grantham £1,750 sqm £2,080 sqm £2,530 sqm 382
    NG31 6 Grantham £1,320 sqm £1,530 sqm £1,750 sqm 164

    Raw data

    Our analysis of NG31 8 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
    32, Grampian Way, Grantham £425,000
    Dec-2025
    		 147 2,891
    108, Hazelwood Drive, Grantham £175,000
    Dec-2025
    		 65 2,692
    40, Alford St, Grantham £142,000
    Dec-2025
    		 77 1,844

    See the entire list of all sales in NG31 8 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.