US grandpa's $100K treehouse becomes $325K backyard castle

What started as a simple plan to build a cozy backyard play area for his grandchildren grew into an impressive architectural project after an American grandfather expanded the idea into a $325,000 custom treehouse complex. According to the Realtor.com, the original budget was between $100,000 and $150,000 for a basic structure. But as new ideas were added, the project continued to grow. Today, the unusual installation looks like a fairytale playground hidden among the trees, complete with a full-size pirate ship and a 200-foot zipline running across the property. The size and detail of the project have turned a private family backyard into a remarkable example of a grandfather’s dedication, combining skilled carpentry with childhood imagination.A modest plan that grew far beyond its budgetThe original idea was fairly simple. The owner wanted to build a strong, raised play structure where his grandchildren could spend summer afternoons outdoors.