Surveying & Map Checking

What We Do

The Public Works and Map Checking Unit:

  • Review subdivision maps within Unincorporated San Mateo County.  Review all Records of Survey, and Corner Records in San Mateo County to assure technical accuracy and adherence to various State and County regulations.
  • Perform field surveys in connection with Public Works related projects.
  • Maintain indexes to various surveying and mapping records.
Please note:
   • Due to pandemic restrictions, Public Works is open to public visitation by appointment only.  
Please visit the following webpage for additional information and to make an appointment:
   • All project application submittals, and limited requests for copies of documents on file, can be emailed to:
   • Project fees for process and review of survey and mapping products must still be submitted via hardcopy check, made payable to       “Public Works”, include the subject property address and assessor’s parcel number, and sent to:
           o 555 County Center
              5th Floor, Public Works
              Attn: Surveys and Mapping
              Redwood City CA 94063

Researching Easements

Recorded easements may be shown on recorded maps, deeds, and occasionally on other recorded documents. You can access the County record maps and other mapping products on the County’s “Property Maps Portal”. Select the “Recorded Property Maps” link under the “Online Research” section on this web page. There is also a link on this web page for instructional YouTube videos on how to search our Public Works map records.

For deeds and other documents, please visit the office of the County Recorder:

Please be aware that easements may exist which are not reflected on record maps or the latest deeds. You may need to contact the utility provider or user of the easement you suspect may exist, contact the City in which you live (If incorporated), or research other/older documents.

“Prescriptive easements” may also exist after prolonged use, even if not contained in a recorded document.



Phone: (650) 363-4100


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Surveying Research Resources

Online Research

Recorded Property Maps - View, download, or print Survey and Subdivision Maps. For inquiries please contact

Video Instructions for the new online research site

Maps not filed for recording - An index of maps in County archives occasionally mentioned in older deeds

External Resources

San Mateo County Genealogical Society - The SMCGS has some land-related records in their databases.

On Site Research

The following records are not available online at this time but can be researched on-site at the Public Works Office:

  • Field Books
  • Right-of-Way Maps
  • Miscellaneous Records

8:00am to 4:30pm

555 County Center, 5th Floor
Redwood City, CA 94063

Please note: All survey research must be performed by the surveyor / engineer. Public Works staff is only available to assist in locating the types of records to be researched and in reproducing maps and field books. We cannot take phone or email requests to research the above mentioned records.


COVID-19 Info
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