Rooftop room addition cost calculator
Estimate the cost band for adding a terrace room with structure, finishes, and waterproofing scope.
Common questions
Can I add a room on any terrace?
Not safely without review. Existing structure, load path, waterproofing, drainage, and municipal approval need to be checked first.
Why include waterproofing in a rooftop room estimate?
Terrace additions often disturb existing roof waterproofing and drainage, so it should be scoped before finalizing cost.