AN extra toilet adds an average of £3,900 and 2.9 per cent to the value of a home in Bradford, which is the highest of Yorkshire’s major cities.

To mark today’s World Toilet Day, the survey found in second place is Leeds, offering value increases of £3,100 and 1.8 per cent.

The averages in England are £5,600 and 2.3 per cent. PropertyHeads, the property portal and social network, crunched the numbers across England’s 25 largest cities to celebrate a day which raises awareness of the global sanitation crisis and the United Nations’ objective of achieving water and sanitation for all by 2030.

It analysed its database of 25 million historic property listings to determine the cost and added value of an extra toilet.

It excluded other significant value-add factors including property type, location and floor area and adjusted the data accordingly, before applying to official Land Registry sold prices via Ourproperty.co.uk (part of PropertyHeads).

It found that England’s most expensive cities unsurprisingly command the highest extra toilet premiums, while the more affordable cities command some of the lowest.

House-hunters pay an average of £16,500 in London, £12,800 in Cambridge and £11,500 in Oxford, which add 3.5, 3.1 and 2.9 per cent to the value of the home, respectively.

Extra toilets in London are 10 times more expensive than they are in Newcastle, currently England’s most affordable city and commanding a premium of £1,700.

Extra toilets there add 1.3 per cent to the value of a home, followed by Liverpool, costing £1,900 and adding 1.5 per cent. There are some exceptions to the overarching trend. Buyers will pay a premium of almost three per cent and £4,000 for an extra toilet in Bradford, despite it being England’s third most affordable city.

An extra toilet in Leeds (+1.8%), Nottingham (+2.1%), Stoke (+2.3%), Manchester (+2.2%) and Bradford (+2.9) will cost buyers between £3,000 and £4,000.