Although I am an agent in Portugal not in the UK, I am assisting my son in selling his property in the UK and buying another one.
In Portugal, properties are valued at a certain amount per square metre depending on the area. Then a bit more is added or subtracted for specific location in a town/village, garage, views, heating, new bathrooms and kitchens, solar panels, swimming pool, EPC rating, etc etc.
The properties where he is viewing differ wildly (totally wildly) on price per square metre. And I cannot see how two houses in the same street, with slightly differing style but exactly the same foot print) can be priced with such a variation.
The way they are advertised as well is interesting. On our adverts, we have to specify exact square metre of the footprint of the house, the covered area of the house and size of the plot. At the end of each page on the website, it provides the average price per square metre of all the properties in that area on that page.
On many adverts in the UK, the size of the property is not noted - even when there are floor plans (obviously with no room sizes otherwise I can calculate it myself!) It does make knowing whether something is outrageously overpriced or good value very quickly. I believe it is useful to know that a property in the same postcode is selling at £3500 per square metre for one property and £6500 per square metre for the other property.