How do I bathroom / kitchen / extension? etc.

How much will inspection hatches cost me?
It will vary from property to property. It is recommended that hatches are at least 300mm x 300mm and wherever possible, be positioned within 1.5m to the side of any joint in the flue system. Therefore, some properties will only need one hatch, while others may need more.

We could in theory take our inspection hatches out now as we replaced the coupled flue with a single pipe earlier this year.