The bigger the size of your barrel vault oven, the more you stand to spend financially. The size vary, with the largest internal dimension of a barrel oven being 1200 mm x 900 mm. this size will cost you $2600 for all the refractory requirements. The standard barrel size is 800 mm x 600 mm. to cut down the costs of building a barrel oven; it is recommended you use locally sourced materials. For example, using a half-cut barrel is a great was of forming the dome and cut down of costs.
Further information: Make your own barrel brick pizza oven and outdoor setting and How to build a pizza oven