The basic rules governing the Land Registry are:
- The Mortgage Law. Its original version dates from February 8, 1861. A new text was drafted by the Act of December 30, 1944 and Decree of February 8, 1946. It was later amended on several occasions.
- Mortgage Regulations. Many of its sections were amended pursuant to the Decree of February 14, 1947.
- Royal Decree 1093/1997 of July 1997, on the Registration of Urban Planning Acts.