Dear experts,
I am interested in a 2-storey inter terrace which was built 25 years ago.
If I were to add on an attic, may I check that the following is correct?
1. The attic can be added on without additional structural support if the 25 y old structure is deemed strong enough. I understand this would require a PE to certify.
2. The attic is to be added on only with additional structural support
In the case of 1 and 2 above, what is the estimated cost range including the re-roofing etc?
Lastly, anyone has done addition of attic and can share your builder?