We specialise in waterproofing and tanking membrane systems, seismic strengthening, concrete defect repairs, structural remediation, protective coatings, seismic movement joints, facade waterproofing, sealants, remedial concrete injection, auto guidance cables, and Newton Systems. 

Established in 1975, Sansom is a specialist company dedicated to solving complex building, bridge, and structural challenges. Over five decades, we’ve built an exceptional reputation for expertise and quality in maintenance, repairs and structural/seismic upgrades. Our proven track record in analysing and solving building problems has positioned us as a trusted partner, and we are now more involved in the front end of the construction industry – completing early contractor involvement projects and tender contracts with all major New Zealand Construction companies.

While primarily serving the upper North Island, we successfully deliver projects throughout New Zealand and internationally in Fiji, Tonga, Samoa, Australia, Papua New Guinea, and Hong Kong.

With over 150 skilled staff specialising in waterproofing and structural remediation, we’re committed to delivering the right solutions for every project.