Five companies that present online house plans for castle-style homes are Archival Design Incorporated, Unique Custom Homes, Eplans, Dream Home Source and Dream Home Design USA. Archivaldesigns.com features castle designs ranging in size from just under 3000 square feet to more than 20,000 square feet.
Archival Designs' plans are based on actual European castles and include designs from manor homes, grand estates and elegant French chateaux.
Unique Custom Homes provides sample plans, large castle plans, construction designs, interior examples and castle pictures from around the world. The company works with customers to re-create a castle or design a unique new castle plan.
Eplans.com offers castle house plans in the modern chateau style, which includes steep and complex roof lines with spires, pinnacles, dormers, turrets and chimneys. Dream House Source also presents castle plans in the French chateau style. The Dreamhomedesignusa.com site contains French castle and chateaux plans.