Reply To: Different baseline grids in same document

If you change the “Relative to” method in Preferences, Grids, from “Top of Page” to “Top Margin”, you can change the margins on your master page and have the first baseline go down with it. Using this method, you cannot change to another start at distance and increment — these are global settings.

However, you can also set specific baseline settings for every single text frame in your document: in “Text Frame Options” select the Baseline Options, then enable “Custom Baseline Grid”. You can also save this settings in an Object Style (in the Text Frame Baseline Options section) , so all it would take is selecting your chapter start frame and apply your new object style.