Richard Sherman’s rise from low-round draftee to NFL stardom with the Seahawks is the textbook sporting definition of going from the outhouse to the penthouse.

So why wouldn’t a mansion be next?

Public records show that Sherman on Friday completed the purchase of a 9,475-square-foot home in Maple Valley resting neatly on 4.96 acres. He bought the house from another famous athlete with Seattle ties — NBA star Jamal Crawford.

Sherman paid $2.31 million to buy the house from Crawford, a former Rainier Beach High star who plays for the Los Angeles Clippers.

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The purchase came shortly after Sherman signed a four-year contract extension with the Seahawks that could pay him more than $57 million through the 2018 season.

Sherman said Monday the contract won’t change him, calling himself still the “raggedy dog’’ who entered the NFL as a fifth-round pick in 2011, regarded by many as something of an afterthought.

“You can teach an old dog new tricks,’’ Sherman said Monday, referring to his humble roots in Compton, Calif. “But you can’t take him away from where he is from.’’

NFL riches can, though, buy him a nice new crib in which to hang out.

Real-estate listings detail that the Mediterranean-style house has an indoor pool/hot tub, three outdoor water features, a billiards room and game room, a wet bar, a personal beauty salon, an athletic court, two floor-to-ceiling rustic stone fire­places, three bedrooms with private decks and, yes, a dog run.

It also contains 6.25 baths, four bedrooms, six covered parking spaces and according to one real-estate listing “a double kitchen with two of everything.’’

All decidedly not me-di-o-cre.

Bob Condotta: 206-515-5699

or bcondotta@seattletimes.com. On Twitter @bcondotta