Christmas might come but once a year, but for former "Happy Days" star Scott Baio, his wife Renee and 8-year-old-daughter Bailey, there's 12 months of planning – and three weeks of hard work on Renee's part – that goes into turning their Los Angeles home into a Christmas wonderland. The couple love Christmas and each year they deck their halls with Christmas tree after Christmas tree featuring unique themes.

"We start at Halloween and continue through Christmas," Renee tells HNGN in an exclusive interview. "'The Nightmare Before Christmas' and 'Alice In Wonderland' are Bailey's favorites, so we start with the 'Nightmare' tree on the piano at Halloween, and everything else expands from there."

The Baio holiday decoration extravaganza started after the couple married in 2007 and took on greater meaning following Bailey's birth later that year. "Having Bailey definitely took this to another level," Scott tells HNGN.

"Five years ago we moved into this house, and I promised Bailey Christmas would be magical," adds Renee. It's something she has delivered ever since.

"I love Halloween, as my birthday is Nov. 2," Bailey shares with HNGN. "I love Sally and Alice." And with Renee's birthday falling on Christmas Eve, the loving family has much to celebrate within the holiday season.

To ensure Christmas is filled with nothing but happy days for the family, hand-made, history-filled ornaments, together with a high attention to detail, ensure the 18 Christmas trees that adorn every corner of the home are simply spectacular.

"It takes upwards of three weeks to do everything, inside and out, as I do all the outside lights too," shares Renee, who gets no professional help. "I do like it to look professional. But I wouldn't do it professionally."

Still, she's not ruling out the possibility of sharing her expertise in a coffee table how-to book of tips. One tip she's happy to share: "When decorating a tree, always start from the top and work your way down."

For the Alice tree, that has pride of place in the home's foyer, Renee used the skills her instilled by her grandmother, who once worked as a seamstress at The Grand Ole Opry. "I get my crafty from my granny," Renee says, laughing.

"I used the plush Disney dolls as the characters, but really paid attention to every detail," she says. "I have about 80 yards of fabric incorporated into the tree, ordered the giant cards from a magician and filled the little bottles that adorn it with food coloring."

There's also homage to Tim Burton's live action version of the story. However, one character won't be found - the caterpillar. "He's smoking," Bailey says earnestly. "Smoking is bad."

For the family room, this year's theme was black, white and red, and following a special request from Bailey, Renee hand made the exquisite tree dresses that adorn the family room. She also has the battle scars to prove it.

"I'll probably never so that again," Renee says with a laugh. "I'm beat up like you wouldn't believe. You have to shape the chicken wire that forms them, cover them with garland and add the lights and the handmade bows. My secret is scrapbooking and some help from Bailey."

"I like to stick with themes, but Santa only comes to our main tree in the formal living room, and that has to be whimsical with a touch of Norman Rockwell," she adds. "Traditionally, there are a lot of handmade things on that tree, and Elvis Presley adorns the tree every year."

This year, Santa's delivery may prove problematic, as Bailey wants an American Girl doll that isn't available until January. "Yeah, she's still figuring that out," Renee says with a smile.

Another tradition for the Baios is their annual "Ugly Sweater Party," ensuring that upwards of 150 of their closest friends and family get to experience their winter wonderland.

"This year I added the ugly sweater tree, to represent the party," says Renee. "It's something we have done for five years, and before it was cool. We give away nice gifts like engraved crystal clocks. It's always so nice to see friends like Garry Marshall ('Happy Days' creator) who's attended and Marion Ross (Mrs. Cunningham), who's our neighbor, came this year."

For Renee, who's already thinking of next year's decorations, pre-planning is paramount. "I already have the trees for next year planned," she shares. "I start looking at the after Christmas sales online."

"I knew last year I would be doing a pastel tree in the kitchen, so all of that was purchased a year ago, " she says. "Scott also has an ornament on that tree (it's inscribed Bah Humbug) with a little Grinch character."

However, despite his Grinchy tree depiction, Scott admits he loves the results.

"My favorite is probably the pastel tree with the 'humbug' ornament, it's cute," he says. "But the mannequin trees Renee built are beautiful. She really outdid herself."

"It's a lot of work for her," he continues. "It's beautiful when she's done and really enjoyable. The neighbors always comment on how great it looks. I never did Christmas like this. Even as a young boy, we'd hang lights and do a Christmas tree, but that was about it - this is quite extraordinary."

When it comes to participating in the home's transformation, Scott reveals he tends to "not be too involved, as I only get in the way." But he did do the lights in the backyard this year. "For the first time!" Renee says, laughing.

"I usually ask she take it back a little, only as it's so much work," Scott says. "But Renee loves it. It is really time- consuming for her ,and I see it go up in stages, but it's always spectacular and so nice when it's all done. How could you not be in the Christmas spirit?"