Building a barndominium, starting with a low-cost shell, is becoming a trendy and fashionable DIY challenge. But questions remain. The Barndominium Shell. Is it a cost-effective solution brought about by increased competition? Several kit builders make theirs available from $7,000 to $40,000 and up. But they come without slabs, doors, or windows as shells-only. Many of them do come with low-cost financing, however. We’ll try to list as many of these kit builders as we can today.