inuti

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inuti

1. inside, within, in

   En xenomorph levde inuti hennes kropp

   An xenomorph lived inside her body

inuti (not comparable)

1. on the inside

   Jag undrar hur en tennisboll ser ut inuti

   I wonder what a tennis ball looks like on the inside

Inne i sounds better for being inside a house, as inuti puts a weird emphasis on the location as within ("in the bowels of") the house (possibly also stuck in a wall). Inne i implies a point of entry and plenty of space, while inuti sounds cramped and/or inaccessible. It is perfectly understandable either way though.

• Jag är inne i huset ― I'm inside the house

For a building one is normally inside for a particular reason (with which it is associated), like a club, a museum, a hospital, or a station building at a train station, inne på is common, putting less emphasis on the building itself and more emphasis on the activity it's associated with. This is also used for attending social media.

• Jag är inne på klubben ― I'm in (inside) the club
• Jag är inne på stationen ― I'm in the station building
• Jag är inne på Facebook ― I'm logged onto Facebook

Dropping the inne makes things even less about the building.

• Jag är på klubben ― I'm at (attending) the club
• Jag är på stationen ― I'm at the train station
• Jag är på Facebook ― I'm on Facebook (have an account)
• Jag är vid klubben ― I'm at (standing outside) the club (for comparison)

For attending school, i is also common.

• Jag är i skolan ― I'm at school

• i
• inne i

• utanför
• utanpå
• ovanpå

• på

• inuti in Svensk ordbok.