Cleanup already has begun at the home of the winning family - whose identity is being kept hidden - to prepare for the project, which calls for removal of the existing house and construction of a new one in one short week.

On Friday the trees surrounding the home had been trimmed to make way for the heavy equipment.

When ABC's Ty Pennington and his crew roll up Sunday, operators and their bulldozers will be on site to raze the home. Construction workers and hundreds of student volunteers from Utah State University and Logan High also will help with the fast-track project.

Home-improvement stores have been pulling construction materials and new furniture and appliances and are standing by, although sales associates have been asked by "Extreme" planners not to talk about the project.

Logan Mayor Randy Watts said hosting the show is a “huge undertaking for the entire valley” and “it has been hard to keep it under wraps.”

Building permits are lined up and law enforcement, fire and street departments will be working overtime to minimize any negative effects from the construction.

“The neighbors will be impacted because this is a 24-7 project,” Watts said. “A lot of people will want to do drive-bys, and they won't be able to because the streets will be closed down.”

Watts said several families scarred by tragedy were contacted by "Extreme Makeover" researchers.

“All of them have circumstances we could [weep] over because they're tough,” Watts said.

Keeping the identity of the winning family secret is critical, he added. “It's a deal-breaker for the show. On Sunday, people will know the location and the people,” Watts said. “Once they go and knock on that door, there is no turning back.”

abrunson@sltrib.com