Contractors, lenders and permit offices ask for these documents constantly, often interchangeably. They're not the same thing, they're not produced by the same people, and mixing them up is one of the most expensive mistakes you can make on a project.
At some point on every project, someone asks for "the survey" or "the site plan" or "the engineering drawings." Whoever is asked nods and says they'll get it, while quietly wondering whether those are three different things or three names for the same document. They are three different things. They're produced by different licensed professionals, serve different legal and technical purposes, and are needed at different stages. Mixing them up costs time, money and sometimes the permit itself.
The confusion is understandable because the documents look similar: drawings of a property with lines, dimensions and notes. But the information in them, the credentials needed to produce them and the questions they answer are fundamentally different. This post breaks all three down, explains where each fits, and covers the most common mistakes.
Document 1: The Survey
A survey is a legal document produced by a licensed land surveyor that establishes the physical facts of a piece of land. It answers the question: what exactly is here, and where are the legal boundaries? The surveyor goes to the site, finds or sets property corners, measures distances and angles, and produces a drawing of what is actually on the ground, not what the deed says or what the prior owner believed.
There are several types. A boundary survey establishes property lines. A topographic survey adds elevations, the contour lines that show how the land rises and falls. An ALTA/NSPS survey, which most commercial lenders ask for, adds easements, encroachments, rights-of-way and other title-related items. Construction staking marks the locations of proposed improvements on the ground so the crew knows exactly where to build.
Survey types and when each is needed:
- Boundary survey. Establishes legal property lines. Needed for permit submittals, subdivision and title work. The base for every other document on this list.
- Topographic survey. Adds elevations to the boundary. Needed for drainage design, grading plans and any project where slopes affect construction.
- ALTA/NSPS survey. Combines boundary, easements, encroachments and title items. Commonly required by commercial lenders before closing.
- Construction staking. Puts the approved design on the ground as physical markers. Needed before grading or foundation work on most commercial and many residential projects.
- As-built survey. Documents what was actually built versus what was designed. Some lenders and jurisdictions require one before the Certificate of Occupancy.
The key point: a survey is a legal record, not a design document. It describes what exists. It doesn't propose what should be built. Only a licensed land surveyor can produce one, and the surveyor's seal makes it a defensible record of the property. In Texas, surveyors are licensed by the Texas Board of Professional Engineers and Land Surveyors. In Florida, they're licensed by the Board of Professional Surveyors and Mappers.
The most expensive survey mistake. Using an old survey, even one from a previous sale of the same property, is a common and costly mistake. Boundaries and conditions change through lot splits, replats, new easements and encroachment settlements. If a lender or permit office decides an older survey doesn't reflect current conditions, they'll require a new one. Order a current survey before design starts, not after.
Document 2: The Site Plan
A site plan is a design document. It proposes what will be built and where, on top of the legal reality the survey establishes. The survey answers "what is here." The site plan answers "what are we building, and how does it fit on this property?" Depending on the project, it's prepared by a civil engineer, a landscape architect, an architect, or for simpler residential work, a drafter or designer. It uses the boundary and topographic survey as its base.
A site plan shows the proposed building footprint with setback dimensions, the driveway and parking layout, utility connections (water, sewer, electric, gas and stormwater), proposed grading to move water away from the structure, landscaping where the jurisdiction requires it, and any easements that limit where improvements can go. It's the document that shows whether the project fits the rules for that piece of land.
That's why the order matters. You can't produce a reliable site plan without a current survey. Site plans drawn from assumed or estimated dimensions set the client up for rejection. If the footprint sits a foot inside a setback that turns out to be shorter than assumed, the site plan is wrong and the permit won't issue until it's fixed.
A site plan without a current survey underneath it is a design built on assumptions. Assumptions are fine until they're wrong.
What Jurisdictions Review on a Site Plan
Reviewers aren't just checking whether the building fits on the lot. They're checking setbacks from every property line, right-of-way and easement. They're checking impervious cover against the maximum for the zoning district. They're confirming the driveway approach meets the city's width and sight-line requirements, that utility connections are shown in the right places, and that stormwater isn't being pushed onto neighbors.
In many Texas cities, site plan review is handled by the planning or development department, separate from the building department that reviews the construction drawings. A site plan rejection and a building plan rejection can happen independently on the same project, and back to back, adding weeks if the site plan isn't right the first time.
When a Site Plan Needs a PE Seal
For simple residential projects in some jurisdictions, a site plan doesn't need an engineer's seal. A designer, an architect or even the owner can produce an acceptable one. For commercial projects, projects in flood hazard areas, projects with real drainage requirements, projects that need a stormwater pollution prevention plan (SWPPP), or any project with significant civil work, expect to need a site plan sealed by a civil engineer. That engineer is certifying the grading, drainage and utility design meets the applicable codes and standards.
Document 3: Engineering Drawings
Engineering drawings are the technical documents that tell the contractor how to build something so it performs as intended. The survey establishes legal reality and the site plan shows what goes where. Engineering drawings show how each part is built: beam sizes, footing depth and reinforcement, circuit routing and sizing, and mechanical system specs.
A full engineering set for a commercial building includes structural drawings (foundation, framing, connections), MEP drawings (mechanical, electrical and plumbing), civil drawings (grading, drainage and utility design in more detail than the site plan), and sometimes fire protection and other special systems. Each discipline is typically handled by an engineer in that discipline, who seals their portion of the set.
What each part covers:
- Structural drawings. Foundation design, framing plans, load paths, connection details and material specs. Sealed by a licensed structural engineer.
- Civil drawings. Grading plans, drainage calculations, utility design and erosion control. The engineering behind what the site plan shows. Sealed by a licensed civil engineer.
- Electrical drawings. Panel schedules, circuit layouts, load calculations, service entrance design and special systems like solar PV, EV charging and emergency power. Sealed by a licensed electrical engineer.
- Mechanical drawings. HVAC design, duct layouts, equipment schedules and energy compliance documentation, coordinated with the electrical drawings.
- Geotechnical report. Not a drawing set, but an engineering document that supports the foundation design. Produced by a geotechnical engineering firm from soil borings and lab testing. Required on most commercial projects and common on residential projects in clay soils like those around Dallas-Fort Worth.
How the Three Documents Work Together
The relationship isn't just sequential. It's cumulative. Each document builds on the one before it, and errors that aren't caught early carry forward. A boundary error in the survey creates a setback error in the site plan. A setback error in the site plan creates a foundation placement error in the structural drawings. That can turn into a failed inspection after construction has started.
So a well-run project goes in this order: boundary and topographic survey first, site plan second using the survey as its base, engineering drawings third using the approved site plan. When projects skip steps, especially starting engineering before the survey is done or drawing a site plan from assumed dimensions, they build coordination risk in from day one.
The Coordination Problem Behind Most Rejections
The most common scenario isn't one bad document. It's two documents that disagree. The site plan shows the building in one place and the structural drawings show the foundation slightly elsewhere. The electrical drawings reference equipment that isn't on the mechanical drawings. The drainage design assumes a grade that doesn't match the topographic survey.
Reviewers look for these inconsistencies because a contractor who doesn't know which drawing to follow may pick the wrong one. When they find them, the package goes back for correction, even if each document is technically correct on its own. The way to prevent this is to have someone review the documents against each other before submittal.
Who Produces Each Document, and Why It Matters
The licensing lines are firm. Only a licensed land surveyor can produce a survey. An engineer can't, and neither can an architect. Engineers seal engineering work within their area of competence, so electrical sheets come from an electrical engineer and structural sheets from a structural engineer. On a commercial site plan, the drainage and utility pieces typically need a civil engineer's seal, even if someone else laid out the building footprint.
The most efficient project teams have the surveyor, civil engineer, drafter or designer, and the other engineers working from the same base file, with someone owning the coordination between documents. When everyone works independently and hands files off without checking each other, the gaps between documents are where permit delays come from.
The unlicensed document gotcha. Online tools and unlicensed designers can produce documents that look like surveys, site plans and engineering drawings. Reviewers check for the required seals. A site plan submitted without a required engineer's seal, or a "survey" without a licensed surveyor's seal, will be rejected at intake before review even starts. Redoing it almost always costs more than hiring the right professional from the start.
Where A1 Engineering Fits
A1 Engineering is the engineering review and sealing layer of this stack. A1 doesn't produce surveys, site plans or architectural drawings. Your surveyor, civil engineer and drafter or designer do. Here's what A1 does:
- PE plan review. A review of the set with code-cited redlines, including checking that the documents agree with each other before you submit.
- Electrical engineering. Load calculations, panel schedules, service design, solar PV, EV charging and generators, sealed by Nick Burton, PE, a licensed electrical engineer in Texas, Florida, Georgia and North Carolina.
- Seals for drafters' sets. A1 reviews the electrical engineering in sets that drafters and designers draw, and seals it once it's right.
- Structural. Foundation and structural engineering is handled by a licensed structural engineer in A1's network, licensed in the project's state.
- Permit support. Responding to comments and carrying the engineering through to the Certificate of Occupancy.
For more on how zoning fits in with all of this, see Zoning vs Building Code.
If you're starting a project and aren't sure which documents you need or in what order, send A1 Engineering what you have and we'll tell you what the engineering needs. You can also call (214) 382-9584 to talk it through.