What is needed to sell an apartment

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Update existing technical documents and collect missing ones;
pay off all debts to housing and communal services and suppliers, as well as to homeowners associations and other organizations;
remove registered residents from the register;
choose a lawyer or, in certain cases by law, a notary to conclude the transaction, or draw up a sample text of the agreement yourself.
What documents are needed to sell an apartment, where to start:

certificate or extract from the Unified State Register of Real Estate on registration of ownership;
title document - purchase and sale agreement, privatization, donation, exchange, etc.;
technical data sheet or plan;
cadastral plan or extract from the Unified State Register of Real Estate;
certificate of family composition, form 9 (prepared by the passport office);
a copy of the personal account with a phone number database statement of the status of accrued and paid utility bills;
notarized consent of the spouse if the apartment is in joint marital ownership;
permission from guardianship authorities if there is a child or incapacitated/partially incapacitated persons among the owners.
If the apartment is in shared ownership or the documented owner is a child or an incapacitated/partially incapacitated person, the purchase and sale agreement must be certified by a notary.
Preliminary agreement
Recently, it has become relevant to conclude a real estate purchase and sale transaction by concluding an agreement of intent - a preliminary purchase and sale agreement. This document obliges the parties to conclude the main purchase and sale agreement within the time period specified by them.