Elin Nordegren just LEVELED her brand new $12 MILLION Florida mansion because, well, she can afford it.

Elin bought the 9,000 square foot North Palm Beach home in March … right after she struck a $100 million divorce settlement with Tiger Woods.

Apparently, Elin felt the modest 6 bedroom, 8 bathroom pad wasn’t quite up to her standards … so she did the only reasonable thing — KNOCKED THE WHOLE PLACE DOWN!

We’re told Nordegren has hired a high-priced architect to build her dream home … and sources say every single worker is required to sign a confidentiality agreement.

No word on how long the project is expected to take — but we’re told Elin is living in a nearby mansion inside the private community while the new place is under construction.