About Oak Joinery How we operate Assurances & guarantees Commitment to quality & the environment Commitment to Compliance | Commitment to Compliance Oak Joinery is a FENSA registered installer (number 31451), guaranteeing peace of mind for our customers that all of our double-glazed window and door installations meet fully with Government Regulations. Similarly, every staircase produced by Oak Joinery meets strict Government criteria relating both to manufacture and installation. | |