SIL is the funding you receive to provide support within the home in order for you to live as independently as possible. Specialist Disability Accommodation (SDA) is dedicated accessible housing for NDIS participants. SDA properties include accessibility options.
You can live in an SDA house while receiving SIL funding to assist you with your daily living activities. You can receive SIL funding without the need for SDA. This means you may not require specialist housing, but still require the levels of support that SIL provides.