LONDON — Natasha Corne is offering Olympic fans who attend this summer’s London Games a piece of her backyard for around $24 a night, including a full English breakfast.

Corne, 36, a health-care worker, has bought a blue tent to house her guests and plans to set up a barbecue on the 1,750 square-foot plot of land in Eltham, southeast London.

“I’ve jumped on the Olympic bandwagon,” said Corne, whose two-bedroom home is 3 miles from the equestrian-event sites in Greenwich. “I haven’t got a massive garden, but there’s enough space to sleep eight.”

The Olympic ritual of renting out space to visitors is under way in London after government cuts triggered the biggest drop in disposable incomes in more than two decades. Homeowners are trying to take advantage of a hotel shortage that’s allowed some operators to charge as much as double the usual rate during the Games.

About 320,000 visitors will converge on the British capital in July, many of them competing with invitees of Britain and the International Olympic Committee for more than 140,000 hotel rooms, according to estimates by the British government’s VisitBritain office.

“There are simply not enough rooms available across all price classes,” said Konstanze Auernheimer, London-based director of marketing and analysis at hospitality research company STR Global. “That’s why many Londoners see this as an opportunity to offer accommodation with a local flavor for less money.”

Corne is one of several hundred people advertising alternative accommodation during the Games on Campinmygarden.com. Londoners are offering houses and apartments to rent on websites such as Londonrentmyhouse.com, Gumtree.com and Craigslist’s London site.

A six-bedroom property in Hammersmith, about a mile from the Earls Court sports hall where the Olympic volleyball competition will take place, is listed for $4,000 a week. A 10-bedroom Hackney Wick home, north of the Olympic Park, will cost about $12,000 a week.

A typical London hotel room during the Olympic Games will cost $330 a night, according to Hotels.com, a website advertising more than 145,000 hotels around the world. That compares with an average rate of about $163 at the same time last year.

By renting a furnished room, homeowners can make about $6,300 tax-free, according to Claire Evans, a director at accounting firm PricewaterhouseCoopers. It costs $32 to place an advertisement on Londonrentmyhouse, while Campinmygarden is free.

The swell of visitors is prompting some residential property brokers in London’s East End, where the 608 acres of wasteland and disused railroads made way for the Olympic Park, to contact tenants before their leases are up and ask whether the space will be free during the Games.

Alan Harvey Property Services mailed renters of the properties it manages four months before the Opening Ceremony. It’s offering two-bedroom apartments near Newham, London’s poorest neighborhood, for $4,000 a week during the Games.

Those prices are as much as five times higher than typical rates, according to Jane Ingram, head of the rental unit at brokerage Savills. The landlords are risking a void in rental income during and after the Games by seeking temporary tenants, she said.

“We don’t know if they’re ever going to get that, as it’s so inflated,” Ingram said. “There’s a lot that people need to think about that they haven’t necessarily considered because they’ve got excited about the pound signs.”

The returns for those turning their gardens into campsites won’t be huge, according to Susan Goode, who’s renting her garden about 10 miles east of the Olympic Park in Romford, Essex for $13 a person per night. She hopes to earn a few hundred pounds to pay for repairs to her garage roof.

“It’s a bit of fun,” Goode said. “If people want to stay, I can earn a little bit of money. I’m not going to make megabucks.”

The competition from private individuals doesn’t appear to have hurt hotel companies. The Lanesborough, a luxury hotel near Buckingham Palace operated by Starwood Hotels Resorts Worldwide, is fully booked for the Games, according to the Stamford, Conn.-based company. That includes a suite for $22,000 a night, the most expensive in London.

Intercontinental Hotels Group, the world’s largest hotelier and the official hotel provider for the Games, has about 86 percent of its rooms in London booked. More than 90 percent of Starwood’s city center hotel rooms have been sold, said Michael Wale, senior vice president for northwest Europe.

TraveLodge, London’s biggest hotelier, opened its 500th British property in Stratford, home of the Olympic Stadium, last month and plans to open another six in the city before the event begins.

Room rates are unlikely to rise further as hotels lower or remove the minimum number of nights required for a booking, according to Seamus MacCormaic, director of market management for Hotels.com.

“Demand isn’t as strong as hotels may have expected,” he said. “They’re testing the water but still holding on to rates.”

The Olympics run from July 27 to Aug. 12 and the Paralympics last 12 days starting Aug. 29. About 8.8 million tickets to events will be sold and will attract more visitors than other Summer Games in Europe, according to a study by Oxford Economics.

About 250,000 people traveled to Barcelona for the 1992 Games, while Athens had around 150,000 tourists in 2004, the researcher said.