With a computer animation of their new house projected on the wide screen at the far end of their architect’s conference room, Alison and Nate Meadows finally allow themselves a moment to breathe. A few clicks of the mouse and a small loop of the architect’s hand swings into view a 360-degree rendering of the home on Saint Andrews Lane: a two-story modern farmhouse, resplendent in bright white, with a black metal roof and a front porch.