GPS accuracy can be significantly reduced indoors. This is because GPS signals from satellites have a hard time penetrating solid objects like walls and ceilings in buildings. Some of the reasons for poor indoor GPS accuracy include:

Signal obstruction - GPS signals cannot pass through solid objects, so they get blocked by walls and ceilings.
Signal reflection - GPS signals can bounce off objects like large windows and metals beams, creating a reflected signal that interferes with the direct signal.
Narrow signal beams - GPS satellites transmit signals in narrow beams, so even small obstructions can block the signal.

To improve indoor GPS accuracy, some solutions include:

Using Wi-Fi and Bluetooth signals in addition to GPS
Using assisted GPS which uses wireless networks to help calculate location
Using dedicated indoor positioning systems that use various wireless signals
Using inertial sensors and dead reckoning to estimate location based on previous position and movement

So in general, GPS accuracy indoors will be lower than outdoors in an unobstructed area. The level of degradation really depends on the specific building construction and what techniques are used to supplement the GPS.
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