Ibiza's Platja d'En Bossa most expensive for holiday rentals, Galicia and Valencia cheapest

Quantity surveyors TecniTasa studied seafront holiday rental property fees per week, and found the difference between the cheapest and the priciest runs into four figures.

A 70-square-metre apartment – typically big enough for two bedrooms – on the popular Balearic beach costs an eye-watering €1,680 a week on average to rent for a summer break.

And the cheapest seaside holiday lets are found in the province of Lugo in Galicia, where a similar or very slightly smaller apartment costs less than €200 a week to rent.

The national average, which has grown 7% since last year, comes in at €595 per week if the property is right on the seafront esplanade or directly on the beach, but variations are vast according to region.

Barcelona and Almería have shot up in price, Castellón and Valencia are going down and the Balearics remain near the top.

Second- and third-most expensive holiday lets in Spain are also found in Ibiza – the Cala Martina bay in Santa Eulàlia des Riu, and Sant Antoni de Portmany, otherwise known as San Antonio.

They even outstrip typically upmarket areas such as Sotogrande (Cádiz province) which even has its own polo club, and Hondarribia – also known as Fuenterrabía – in the Basque Country province of Guipúzcoa, the capital of which is San Sebastián.

At €595 a week, the average Spanish family would spend 27% of their monthly household income on a beach 'staycation', but much cheaper lets can be found easily.

'Cheap' does not mean 'lacking in quality' – some of the areas with the lowest prices are either less touristy but still with proper facilities at hand and, because they are not as well-known, offer much more space on the beach, whilst in other areas, holiday home supply outstrips demand, bringing prices down.

Spain's most affordable coastal locations for holiday lets are mainly in the far north-western region of Galicia - Esteiro, Portosin, Boiro, Muros, Riberia (A Coruña province), and Burela and Vicedo (Lugo province) – as well as in Las Palmas de Gran Canaria at the Las Canteras beach, or in parts of the Comunidad Valenciana on the east coast.

In the latter, bargain holiday rentals can be found on the Castellón province coast in Oropesa, Canet d'En Berenguer, Almassora, Moncada and Xilxes, or on that of the Valencia province along its northern stretch up to the Castellón border, as well as in the far south of the province in Gandia, Tavernes, and Oliva.

Apartments to rent for a week's holiday in Oliva, ranging from 40 to 90 square metres – roughly a small one-bed flat to a spacious three-bed – come in at an average of €290.