I'm unclear about what you are trying to do and what your current set up is.

Is there a main breaker outside your home that feeds the 'main' panel in the townhome that in turn feeds the subpanel in the shed?

Or does the main breaker feed both the 'main' panel and the shed's subpanel separately?

And what are you looking to do? Add a transfer switch in the shed that will switch power at the house?

I personally can't answer your question, but a clearer description will help others answer it.

I'm familiar with what he is describing. The service disconnect is at the meters in the "shed" and he has a panel (not the service disconnect) inside the unit.

There's no real issue with installing a transfer switch in this situation but he needs to understand he almost certainly needs to bring in a electrician for this. Multifamily houses are not places to be screwing around with DIY work.

Ron Natalie has it correct. There is no panel of any kind in the townhome. The only panel is a sub panel located in the attached shed. With the service disconnect located down the street at the meters.

I have absolutely no intention of attempting this myself. My DIY electric skills are fixtures and replacing worn out electrical outlets, lol.

Want to get a transfer switch installed to the subpanel in the shed so I can hook up a portable generator during power outages. Having no electrical knowledge I didn't know if having a sub panel with the main disconnect located elsewhere created an issue or extra work, etc.

Looking for advice on what to ask for when getting bids so I can seem somewhat versed in what I need. And rough approximate costs do so in the Northeast area.

Thanks again for the quick replies. Most appreciated.

Get bids from multiple contractors, get references (especially ones from people you trust). I