Our work is the foundation of any project, big or small. One mistake impacts everything, costing everyone time and money. That’s why our goal is to get your project signed, sealed, and delivered in record time, with precision and ease.


We approach every project with meticulous care yet bold determination. We may be juggling hundreds of jobs at once, but you’ll never know it. Because we’ll be there to see your project through every detail, and we won’t stop until the job is done right.


As one of the only firms whose sole focus is land surveying, you can rest assured that we’ve got the chops for your job. Curveballs don’t faze us. Delays aren’t in our vocabulary. And we’ve seen it all.

SDOT/SIP Surveys


A Seattle Department of Transportation (SDOT) survey is typically associated with engineering-level projects to provide highly detailed topographic basemaps with a heavy emphasis on Right-of-Way (ROW) and utility data. Many SDOT survey projects are focused on utility extensions or upgrades and Street Improvement Permits (SIP) within the city of Seattle Jurisdiction. Attention to detail is critical on these project types, and you can trust our team to get it right the first time, mapping with complete accuracy all on- and off-site improvements.

Read more Environmentally Critical Area (ECA) Surveys


Environmentally Critical Areas (ECAs) typically include pieces of land that vitally impact the surrounding environment. ECAs can include wetlands, wildlife habitats, or environmentally hazardous areas, but they often have differing designations depending on the jurisdiction.

Read more Boundary/Topographic Surveys


A topographic survey is the representation of real world, 3D characteristics of a property. This survey is comprised of site data and elevation points (spot elevations) on a portion of land and presents them as contour lines on a drawing to show the shape, configuration, and relief of the surface. A contour line represents the heights of the land. A topographic survey collects vertical (and horizontal) information of the natural and improved (man-made) features of the property, noting elevations on each element.

The survey shows the location, size, and height of these site improvements, as well as gradual changes in elevation (typically in two-foot contour intervals). Topographic surveys are typically used to show elevations and grading features for design and site planning for homeowners, architects, engineers, builders, contractors and other professionals.

Read more Boundary Surveys


Boundary Surveys are the determination of bearings and distances, computed per a legal description, that define the limits of a tax parcel. Typically, boundary survey aims to set permanent markers, physically on site, at the exterior limits of the parcel per the deeded legal description.

Terrane will then represent the parcel boundary data on a survey drawing, showing lines of occupation, fences, and any encroachments that were mapped along the limits of the property.

Read more Boundary/House Surveys


The determination of bearings and distances, computed per a legal decription, that define the limits of a tax parcel. Lot corners are set or recovered. Fences, lines of occupation, and encroachments are mapped, and the existing structure is located on site.

Read more ALTA Surveys


An ALTA survey is a visual representation of what is contained within a title report for a property. A title report can be hundreds of pages of legal descriptions of the property, easements or encumbrances on the property, encroachments, and liens. It’s a running list of everything that has happened or affects a certain piece of land.

In addition to completing a thorough Boundary Survey and locating any improvements or possible encroachments along the boundaries, we also locate the building(s) and other improvements, including roads, walkways, parking, and visible utilities.

Once we have created this aerial image (sometimes literally using a drone) of the property, we then overlay any easements that affect the property, usually related to ingress-egress and utilities entering and leaving the site. There is also an option to incorporate zoning information on the survey to make sure the property is in compliance with current zoning regulations.

Read more Legal Description & Map Exhibit


A legal description and map exhibit are used for land titles to recognize a definable or metes-and-bounds area over a portion of property to be designated for a specific use or conveyance.

Read more FEMA Certificate


Terrane will prepare and certify your elevation certificate as required by the Federal Emergency Management Agency (FEMA). Only a licensed land surveyor or engineer can provide the certificate, which includes elevation data that FEMA can use to accurately assess flood risks to structures within flood hazard zones.

Read more LOMA Application


A Letter of Map Amendment (LOMA) is an official amendment to an effective National Flood Insurance Program (NFIP) map, which is issued as a letter to the homeowner after review and approval by FEMA. If issued, the LOMA letter can provide your insurance company proof that your property is at a lower risk of flooding than the original NFIP map indicates, which equates to a lower insurance premium for you.

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