Many thanks both. I will be careful with the fumes.
After I posted here, I tried a structural engineer and was surprised that they will assess a small project like this. They're coming next week.
Hi
I'm building a den for my children in the garage roof. Before I go any further I want to hire someone to take a look and tell me whether the garage structure will take the weight.
Can anyone advise me please on who I should be getting in touch with? An architect? Structural engineer...