Buy Building Supplies, Tools and Hardware Online | McMahons ..4 Dec 2017 . Nationwide & 100% Irish Owned, McMahons Builders Providers are one of Ireland's largest independent building providers. Leading stockist of Building Materials, . Cottage Fence 1.8m x 600mm Treated. Product Code: 46021 . Inishowen Fence Panel 1.8 x 1.8m Treated (Green). Product Code: 46079.