If you are trying to get more habitable office space, the requirements change quite a bit.

Finishing an attic to get more storage is much easier than turning it into occupied space. One of the first measurements you need to get is the height of the joists in the attic floor and how long they are. In many cases these joists just serve as rafter ties (they tie one side of the house to the other and support the ceiling below) and they are not robust enough for occupied space. However, rafter ties are usually sufficient to use the attic as a storage area or to support HVAC equipment.

Bruce

Code requirements differ according to the intended use of the space. The first concern with converting storage space into habitable living space is whether the structure is adequate for the new purpose. This includes a look not only at the floor, but the wall structure supporting the space as well. Get an assessment from your structural engineer first.

Do you have a way to get code-compliant stairs to the space without making a mess of the floor below? If not it may be a non-starter. Many attic stairs are too steep, too narrow, or both.

It is not built with trusses, but rather stick framed.

From what I can tell, the stairs seem code complaint according to our village code. Minimum of 9.5 inch tread (measures exactly that) and 8 inch maximum rise. I don’t yet know the height of the joists.

Ceiling height will need to meet code as well.

Different localities have very different interpretations of the same code requirements. In my area, existing doors and stairs are usually considered to be grandfathered. Headroom and sufficient floor structure is the main concern for converting existing walkup attic space. New or altered access must conform to current codes and egress windows are a must.

Why doesn’t the door meet code? It’s the same height and width as every other door on our second floor. We live in a historic distract so the code measurements are probably adjusted to when our house was built in 1922.