Their burrows undermine foundations, sheds and pools, and devastate vegetable gardens. We capture them humanely and relocate them to natural habitat.

No. We use live-capture cages, checked frequently to minimize stress, and the animal is released in suitable natural habitat. No cruel methods.
No: the groundhog will reopen it within hours or dig a new exit — sometimes somewhere worse. And if it's trapped inside, it dies under your structure. Capture first, closure after.
As soon as you see the animal or an entrance hole (20–30 cm with fan-shaped dirt). Avoid late fall: it hibernates and capture becomes impossible until spring while galleries keep weakening your structure through the thaw.
Describe your problem: a certified technician calls you back with a firm price.
A certified technician replies within 6 hours on average. Fixed price announced before the visit, 6-month written guarantee.