The undermentioned my reply is in consonance with the reply of Sh.Sadanand Bulbule, Sir. Therefore, my reply should be read conjointly with his reply.
(i) Sale of land (plot) is neither supply of goods nor services as per Clause 5 of Schedule-III. Hence it is non-GST supply and GST is not leviable. The words, "sale consideration including GST" confirm that the builder has collected GST from you. which is not leviable. He cannot retain with him.
(ii) As per Section 76 (1) of CGST Act, the builder is statutorily bound to deposit the said amount of tax with the Govt.
(iii) As per Section 54 (1) of CGST Act, any person can claim refund. For claiming refund as an individual, being unregistered, you can apply for refund under Section 54 (1) of CGST Act read with Board's circular appended below
Refund for unregistered person under CGST Rule 89(2) — Implementation of filing an application — Clarification
C.B.I. & C. Circular No. 188/20/2022-GST, dated 27-12-2022