Short answer. It depends on assessed value. Real property always requires twenty days of posting in three public places. Publication in a newspaper is required on top of that only where the assessed value of the property exceeds fifty thousand pesos, and then once a week for two consecutive weeks.
What the law says
if the assessed value of the property exceeds fifty thousand (P50,000.00) pesos, by publishing a copy of the notice once a week for two consecutive weeks in one newspaper selected by raffle
Rule 39, Section 15 — Notice of sale of property on execution. Read the full provision →
What the law says
written notice of the sale shall be given to the judgment obligor, at least three days before the sale
Rule 39, Section 15 — Notice of sale of property on execution. Read the full provision →
Posting is the baseline for real property
Section 15 sets different notice requirements for different kinds of property, and real property carries the longest. Before the sale, notice is given by posting for twenty days in three public places, preferably in conspicuous areas of the municipal or city hall, the post office and the public market in the municipality or city where the sale is to take place. The posted notice is not a bare announcement. It must particularly describe the property and state where the property is to be sold. Posting applies to every execution sale of real property, whatever the value of the land involved.
Newspaper publication turns on assessed value
Publication is an additional requirement, not an alternative to posting, and it is triggered by value. Where the assessed value of the property exceeds fifty thousand pesos, a copy of the notice must also be published once a week for two consecutive weeks. The measure named in the provision is assessed value, which is not the same figure as the market price or the amount of the judgment. Below that threshold, the twenty-day posting stands on its own and the Rules do not add a newspaper requirement for the sale.
Which newspaper, and in what language
The provision does not leave the choice of newspaper to either party. Publication is in one newspaper selected by raffle. As to language, the notice may be in English, Filipino, or any major regional language. The paper must be published, edited and circulated in the province or city where the sale is to take place, or, in the absence of such a paper, one having general circulation there. Each of those elements is part of the requirement, so a publication that satisfies the frequency but not the selection method has not met what the section describes.
You are entitled to personal notice as well
Posting and publication are directed at the public. Separately, in all cases, written notice of the sale must be given to the judgment obligor at least three days before the sale, in the same manner as personal service of pleadings and other papers. The only variation is for perishable property, where notice to the obligor may be given at any time before the sale. So an owner is entitled both to the public notice that brings bidders and to a direct written notice, and the absence of either is a matter to raise with counsel at once rather than after the auction.