In plain English
FAR 52.236-27, Site Visit (Construction), is a contract clause prescribed at FAR 36.523, most recently dated Feb 1995. The complete official text is reproduced below, verbatim, from GSA's published FAR source files.
Its text contains no sentence requiring insertion into subcontracts; see the flowdown section below for what that does and does not mean.
Does it flow down to subcontracts?
No flowdown mandate found in the clause text
We scanned the full clause text and found no sentence directing the contractor to insert this clause into subcontracts. That is a statement about the text, not legal advice: a prime contractor may still flow terms down contractually, an agency supplement (DFARS, VAAR, …) may add requirements, and clauses listed below (if any) may order this clause into subcontracts from the outside.
Where it's prescribed
As prescribed in 36.523 , insert a provision substantially the same as the following:
Prescribing reference: FAR 36.523.
The official text, verbatim
As prescribed in 36.523 , insert a provision substantially the same as the following:
Site Visit (Construction) (Feb 1995)
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(a) The clauses at 52.236-2, Differing Site Conditions, and 52.236-3, Site Investigations and Conditions Affecting the Work, will be included in any contract awarded as a result of this solicitation. Accordingly, offerors or quoters are urged and expected to inspect the site where the work will be performed.
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(b) Site visits may be arranged during normal duty hours by contacting:
Name: ____________________________________________
Address: __________________________________________ __________________________________________________
Telephone: ________________________________________
(End of Provision)
Alternate I (Feb 1995). If an organized site visit will be conducted, substitute a paragraph substantially the same as the following for paragraph (b) of the basic provision:
(b) An organized site visit has been scheduled for-
__________________________________________________ [Insert date and time]
(c) Participants will meet at-
__________________________________________________ [Insert location]