Bert Nietzen picture

It is with a sad and heavy heart that we mourn the passing of Bert Niezen
(proud and steady owner/operator and creator of OBS and then GBS)

We thank everyone for their prayers and kind wishes during this time and during his
battle with health these past months.
We will miss him dearly and he will be forever in our thoughts and hearts.
Prayers to his Beautiful Family.

OBS & GBS Staff & Friends

Proud Member of the Timber Mart Buying Group

Guelph-Orangeville Building Supply has grown over three generations and three decades, with a focus on high standards, quality products, knowledgeable staff, and a "customer first" philosophy. Bert Niezen, owner of Orangeville Building Supply began the family business in 1991 and the Niezen family opened the doors of Guelph Building Supply in 2004.

Customer service remains our number one value, and is matched up by superior products, reputable suppliers, and an incredible staff. It's a winning business model that allows both locations to maintain an elevated reputation throughout Dufferin/Wellington County and beyond.

Visit us weekly on

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Guelph Timber Mart

Orangeville Building Supply Delivery Truck