Despite that he’s a high-ranking royal, Prince Charles doesn’t exactly seem scary. However, his keen eye apparently makes some people quite nervous when they’re showing off their work.

Prince Charles created a community called Poundbury in Dorset in 1993 to much success and he restored Dumfries House and started building a development called Knockroon on the edge of the estate more recently. In 2012, a documentary following the latter project revealed that developers are actually very nervous around the Prince of Wales.

Kim Slowe, a developer for Poundbury and Knockroon, according to Express, admitted his nervousness. “You always quite look forward to his visits but you also slightly fear them, because you’re not quite sure what’s going to come back to you,” Slowe explained. “Because you know he won’t miss any of the details.”

Prince Charles apparently is unafraid to make changes, using a red pen to cross out and edit plans. Perhaps Charles’ passion stems from his fears about climate change and the environment.

“It does seem to me insanity if we are going to bequeath this completely polluted, damaged and destroyed world to them,” he said last year during a royal visit to Ghana (via the Telegraph). “All grandchildren deserve a better future.”

The Prince’s first development is carbon neutral. His second is intended to be similarly eco-conscious, but is still in the midst of being built. According to the Scotsman, after eight years, only 31 homes have been built. The original schedule was for 330 to be done by 2017. The plans, which span 25 years, include 770 homes eventually being built in the area.

Prince Charles
Prince Charles waves as he attends the Royal Cornwall Show on June 7, 2018 in Wadebridge, United Kingdom. Getty Images/Time Rooke