(posting as an answer because my comment didn't fit in comments) I suspect PG&E will only allow you one drop in and one metered input  , and from that meter you will feed all the subs including the house. They will either upsize the existing feed to the garage to support 200A, or run a new main to the closest place convenient for them, and you will be responsible for back feeding all the panels including the house. Actually, 200A seems light assuming your house is 100A itself with the shop equipment, the dual chargers, water heaters, and potentially another dwelling. I had a similar project (adding a shop and upgrading to 400A and moving the mains feed to the shop and making the house a 200A sub panel) see Sizing Ground wire for 200AFeeder to House and What component do I need to add my own "Private" electric meter I must add that I am not in CA and not familiar with PG&E requirements. Lastly, PG&E has likely has a list of approved meters they allow or you will need to be get familiar with the PG&E Greenbook, yours will have to be Bottom fed by UG cable, and pay attention to the manual bypass test requirements.

6.2.2 Test-Bypass Facilities

For single-phase residential installations, test-bypass facilities may be provided, but are not required.

(followed by a list where test-bypass equipment IS required)

I suspect PG&E will only allow you one drop in and one metered input, and from that meter you will feed all the subs including the house. They will either upsize the existing feed to the garage to support 200A, or run a new main to the closest place convenient for them, and you will be responsible for back feeding all the panels including the house.

Actually, 200A seems light assuming your house is 100A itself with the shop equipment, the dual chargers, water heaters, and potentially another dwelling. I had a similar project (adding a shop and upgrading to 400A and moving the mains feed to the shop and making the house a 200A sub panel) see Sizing Ground wire for 200AFeeder to House and What component do I need to add my own "Private" electric meter

I must add that I am not in CA and not familiar with PG&E requirements. Lastly, PG&E has likely has a list of approved meters they allow or you will need to be get familiar with the PG&E Greenbook, yours will have to be Bottom fed by UG cable, and pay attention to the manual bypass test requirements.

6.2.2 Test-Bypass Facilities

For single-phase residential installations, test-bypass facilities may be provided, but are not required.

(followed by a list where test-bypass equipment IS required)

(posting as an answer because my comment didn't fit in comments) I suspect PG&E will only allow you one drop in and one metered input , and from that meter you will feed all the subs including the house. They will either upsize the existing feed to the garage to support 200A, or run a new main to the closest place convenient for them, and you will be responsible for back feeding all the panels including the house. Actually, 200A seems light assuming your house is 100A itself with the shop equipment, the dual chargers, water heaters, and potentially another dwelling. I had a similar project (adding a shop and upgrading to 400A and moving the mains feed to the shop and making the house a 200A sub panel) see Sizing Ground wire for 200AFeeder to House and What component do I need to add my own "Private" electric meter I must add that I am not in CA and not familiar with PG&E requirements. Lastly, PG&E has likely has a list of approved meters they allow or you will need to be get familiar with the PG&E Greenbook, yours will have to be Bottom fed by UG cable, and pay attention to the manual bypass test requirements.

Blockquote

6.2.2 Test-Bypass Facilities For single-phase residential installations, test-bypass facilities may be provided, but are not required. (followed by a list where test-bypass equipment IS required)

Blockquote

(posting as an answer because my comment didn't fit in comments) I suspect PG&E will only allow you one drop in and one metered input , and from that meter you will feed all the subs including the house. They will either upsize the existing feed to the garage to support 200A, or run a new main to the closest place convenient for them, and you will be responsible for back feeding all the panels including the house. Actually, 200A seems light assuming your house is 100A itself with the shop equipment, the dual chargers, water heaters, and potentially another dwelling. I had a similar project (adding a shop and upgrading to 400A and moving the mains feed to the shop and making the house a 200A sub panel) see Sizing Ground wire for 200AFeeder to House and What component do I need to add my own "Private" electric meter I must add that I am not in CA and not familiar with PG&E requirements. Lastly, PG&E has likely has a list of approved meters they allow or you will need to be get familiar with the PG&E Greenbook, yours will have to be Bottom fed by UG cable, and pay attention to the manual bypass test requirements.

6.2.2 Test-Bypass Facilities

For single-phase residential installations, test-bypass facilities may be provided, but are not required.

(followed by a list where test-bypass equipment IS required)