DIY Tree House. This is 18 ft. in the air. It is approx. 150 sq. ft. with a 100 sq. ft. loft. I used Garnier limbs to support it. He says they hold 8,000 lbs. each. The porch was done with a Tenon cutter. The suspension bridge is 40 ft. long. It is all cedar tongue & groove with bamboo flooring.