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Do I need a structural engineer for a new flat roof?
We're replacing the flat roof on our extension and the builder says we don't need a structural engineer but I want to check. Is it required and when does it become necessary?
Expert Trade Answers
"Good Morning Sarah,
if your simply replacing the existing roof covering and the roof Dec and supporting joists remain exactly the same and in good condition then no you don't.
Hope this helps"
if your simply replacing the existing roof covering and the roof Dec and supporting joists remain exactly the same and in good condition then no you don't.
Hope this helps"
Answered on 1st Jun 2026 - Member since May 2026 -
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"Not if your just changing the covering however if more than 25% of the roof is getting change it’s advised to inform building control to make them aware of the changes been made"
Answered on 1st Jun 2026 - Member since Oct 2023 -
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