The following are some of the Castle Products we carry:
  • Windows
  • Doors
  • Pine
  • Paint
  • Paint Accessories
Come by to see what else we carry.

Castle Toolbox App


Hello and welcome to National Building Supplies Ltd..
You can find us at 22903 Highway 48, just north of Ravenshoe Road; about 20 minutes north east of Newmarket.
Here at National Building Supplies Ltd., we have pretty much a little bit of everything including the kitchen sink in our 5 buildings on 5 acres. We are also a Castle Building Centre which allows us to help you save money on all your building requirements. Bring in your material list for a package price.
Along with salvage materials we also have many cuts of pine, construction lumber and pressure treated lumber, a full steel assortment, plus windows, doors, assorted fasteners and for something unique - Antique / Vintage.
So come in and see for yourself. You won't believe your eyes. We are sure you will find something of interest. Our friendly team will be happy to help and serve you.
See you soon!

"The item you looked at today & want to think about until tomorrow may be the same item someone looked at yesterday & will buy today"


Monday - Friday
8am - 5pm
9am - 2pm
(April - December)