In 1078 King William used Gundulf's skill in the construction of the White Tower: the keep of the Tower of London, he was described as "competent and skilled at building in stone and was the principle overseer and surveyor of the White Tower of London"; also the castle at Colchester which was started around 1080. Colchester is attributed to Gundulf on the basis of the similarity in plan and design to the White Tower.
In 1078, King William used Gundulf's skills for the construction of the White Tower: the keep of the Tower of London; he was described as "competent at stone building and the principal overseer of the White Tower of London"; also the castle in Colchester that began around 1080. The similarity in design to the White Tower led to attributing the Colchester structure to Gundulf.