Build garden archway family handyman, Now find ideal spot yard trellis lay footprint (photo 6). sturdy stable, sink arch 18 . ground. measure leg wrap tape 18-. mark depth guide (photo 7). helper, press ends arches ground.. Now find the ideal spot in your yard for the trellis and lay out the footprint (Photo 6). To keep it sturdy and stable, you have to sink each arch end about 18 in. into the ground. Measure up each leg and wrap tape at the 18-in. mark as a depth guide (Photo 7).With a helper, press the ends of the two arches into the ground. Build wooden garden arbor: 6 steps ( pictures), We wanted small arbor garden entrance. wood, simple, arts crafts craftsman style.. We wanted to have a small arbor for a garden entrance. We were looking for something made of wood, and fairly simple, with an Arts and Crafts or Craftsman style. How build arch arbor home guides sf gate, After completing basic structure, build arch top arbor frame. 1 cut pieces 2--6- lumber width arbor, adding 1 2 feet extra length overhang sides, desired.. After completing the basic structure, you can build an arch for to the top of the arbor frame. 1 Cut two pieces of 2-by-6-inch lumber to the same width as the arbor, adding 1 to 2 feet of extra length to overhang on the sides, if desired.