Which entities must certify a land survey for it to be valid?

• A. Barangay and DENR
• B. Surveyor and DENR
• C. Local Government Unit only
• D. Surveyor alone

Answer: (B)

In land surveying, a plan becomes legally usable only when it carries both professional and government certification. The surveyor’s certification verifies technical accuracy: field measurements, calculations, closures, and the plan’s proper depiction of boundaries and features. The DENR’s certification provides government validation that the survey complies with cadastral rules and is suitable for registration or patent processes, ensuring it doesn’t conflict with official land records. Without the surveyor’s seal and certification, the plan isn’t trusted as a professional work; without DENR certification, it isn’t recognized for legal land transactions. The LGU or barangay handle local administrative aspects, but they do not substitute for the required professional and DENR certifications. Therefore, the correct requirement is certification by both the surveyor and the DENR.