The modest house where Harry Potter (search) lives with the dastardly Dursley family is about to make a small fortune for its Muggle owner.

Tomorrow, Sandra Smith is auctioning off the three-bedroom, English residence that was used as Harry's home in the movies Harry Potter and the Sorcerer's Stone (search) and Harry Potter and the Chamber of Secrets. (search

And because of the notoriety the property has received, there's a minimum bid of $425,000 - more than $100,000 over its actual market value.

"It would be brilliant if somebody pays a million [pounds] for it!" Smith, an office secretary and mother of two, gushed to London's The Mail on Sunday.

The unassuming little home is actually located on 12 Picket Post Drive in Bracknell, Berkshire, about 75 miles from London.

But to Potter fans, it'll always be 4 Privet Drive in the town of Little Whinging, Surrey - the place where Harry has to spend miserable summers with Uncle Vernon, Aunt Petunia and the insufferable Dudley.

The house was featured in many key scenes in the movie, including when baby Harry is dropped off by Hagrid (search) and when the flock of Hogwarts owls flies in to deliver mail to the boy wizard.

After the first movie was released in 2001, the folks along Picket Post Drive suddenly found their usually sedate street getting very crowded as tour buses began pulling up and curious motorists drove by.

But Smith, 52, has had to burst the bubble of many a young fan who knocks and asks to see the cramped cupboard under the staircase that serves as Harry's bedroom.

That's because all the interior shots of the house were filmed in a studio.

"They are very disappointed when I tell them that it's not the same as in the film," she said.

The agency handling the sale, FPD Savills, believes the exterior is so recognizable as Harry's home, it's bound to earn a fortune when the bidding begins tomorrow at a hotel in London.

"It's quite possible that a wealthy Harry Potter enthusiast, perhaps from abroad, will offer up a large sum for the privilege of owning the Dursleys' home," broker John Vaughan told the Mail.

But while Smith raked in thousands of dollars a day when Warner Bros. crews rented the property for the movie shoots, the next owner can't be guaranteed the same windfall.

That's because the studio has built of replica of the residence on a sound stage so it will have more control of the set on future Harry Potter flicks.