NEWQUAY, England — People who move to Nansledan, a new residential community in the southwestern corner of England, must abide by certain rules.

Homes and doors can be painted only certain colors, including pastel pink and eggshell blue. Local businesses are welcome to set up shop, but no fast-food chains, please. And don’t think of tampering with the dime-size holes in some of the bricks outside the houses: They are there to make homes for bees.

Also, don’t be surprised if you see Charles, the Prince of Wales, strolling down the street, admiring what he has wrought.

Nansledan, which will eventually have about 4,000 homes, could be the most ambitious project undertaken in the 700 years of the Duchy of Cornwall, the patchwork of properties spread across England, covering more than 200 square miles, that provides an income to the Prince of Wales.