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Plans Versus What Was Built

What Are As-Built Plans, and Why Do They Matter?

Approved plans show what a developer was authorized to build. As-built plans are supposed to document what was actually constructed in the field. When flooding begins after development, the difference between those two records can matter.

As-built plans are not merely another copy of the original design. They should reflect the completed locations, dimensions, elevations, slopes, structures, pipes, ponds, roads, utilities, and other improvements as they were constructed.

📐 Approved design

What was supposed to be built

These plans show the design reviewed and approved before or during construction.

📍 As-built record

What was actually installed

These plans should document the completed project and any field changes from the approved design.

🌧️ Stormwater

Small differences can matter

A changed elevation, pipe size, slope, pond outlet, or overflow route can affect where water travels.

🔎 Verification

Compare plans with field conditions

Records, inspections, surveys, certifications, and photographs should be reviewed together.

Jump to a section

What as-built plans are Design versus as-built Stormwater details Changes that matter Certification Records to request How to compare plans Questions to ask

What is an as-built plan?

An as-built plan is a record drawing intended to show the completed construction as it exists after the work has been performed.

Approved design plan

The proposed project

The approved design plan shows the project the applicant, engineer, architect, surveyor, or developer proposed to construct and the government or permitting agency reviewed.

It may include:

Proposed building locations
Proposed roads and parking areas
Proposed grading and elevations
Proposed drainage pipes and culverts
Proposed retention or detention ponds
Proposed stormwater calculations
Proposed overflow routes
Construction details and specifications

As-built plan

The completed project

The as-built plan should record the project as constructed, including relevant field measurements and approved changes made during construction.

It may include:

Actual building and pavement locations
Actual finished elevations
Actual pipe sizes and locations
Actual culvert elevations
Actual pond dimensions and depths
Actual inlet and outlet elevations
Actual slopes and drainage routes
Recorded deviations from the design

Approved plans answer, “What was authorized?” As-built plans should answer, “What was actually constructed?”

Why the difference matters

Feature	Approved plan	As-built plan	Why residents should care
Ground elevation	Proposed finished elevation	Measured completed elevation	A raised or lowered area can redirect runoff.
Drainage pipe	Proposed diameter, material, slope, and location	Actual installed pipe information	A smaller, higher, damaged, or relocated pipe may affect flow.
Culvert	Designed inlet and outlet elevations	Completed elevations and location	A culvert installed too high may hold water back.
Retention pond	Designed size, depth, volume, and outlet	Actual pond dimensions and structures	Less storage may reduce flood protection.
Road	Designed crown, grade, and elevation	Actual completed road elevations	A road can act as a barrier or overflow path.
Overflow route	Intended emergency path for excess water	Completed grading and physical route	Water may travel toward existing homes if the route changed.
Drainage connection	Proposed connection to an existing system	Actual tie-in point and elevation	The connection may affect older downstream infrastructure.
Property grading	Proposed contours and slopes	Completed contours and elevations	Fill and grading can change historic drainage patterns.

A field change is not automatically improper. Construction projects commonly require adjustments. The important questions are whether the change was documented, reviewed, approved when required, accurately shown on the as-built plans, and evaluated for drainage impacts.

What stormwater information should appear?

The exact contents depend on the project, jurisdiction, permit, and applicable standards. For flooding investigations, the following details can be especially important.

Finished ground and road elevations

Elevations show the height of completed land, roads, building pads, berms, swales, pond banks, and drainage structures.

Residents may want to compare:

Development elevations with existing neighboring homes
Road elevations with nearby yards
Finished lots with the predevelopment ground
Berm elevations with intended overflow routes
Low points shown on the plans with actual low points

Drainage pipe and culvert information

A useful as-built record may identify the actual pipe diameter, material, length, location, slope, inlet elevation, and outlet elevation.

Important questions include:

Was the approved pipe size installed?
Was the pipe installed in the approved location?
Do the completed elevations create positive drainage?
Were additional pipes or connections installed?
Were any pipes removed, shortened, or relocated?
Does the outlet connect to the intended downstream system?

Retention and detention pond details

Pond performance depends on more than the outline visible from the road. The depth, bottom elevation, side slopes, normal water level, control structure, outlet, overflow elevation, and available storage all matter.

Review whether the as-built plans identify:

Pond top-of-bank elevation
Pond bottom elevation
Normal or seasonal water level
Side slopes
Control-structure dimensions
Outlet pipe size and elevation
Emergency overflow elevation
Actual storage volume, when required

Swales, ditches, and drainage easements

Swales and ditches can appear minor but may carry water between lots, roads, ponds, and downstream systems.

Check:

Actual ditch and swale locations
Bottom elevations
Top width and depth
Direction of slope
Connections to culverts and ponds
Whether structures or landscaping obstruct the route
Whether the feature lies within a recorded easement

Emergency overflow routes

Stormwater systems have limits. When pipes or ponds are exceeded, water needs a planned route that reduces danger to buildings, roads, and neighboring properties.

Ask whether the completed project preserves:

The approved emergency overflow path
The approved overflow elevation
Clear passage through the development
Protection for existing homes
Safe road-crossing locations
Connections to the intended receiving system

Impervious surfaces and developed area

Roads, roofs, sidewalks, parking lots, driveways, and other hard surfaces can affect how quickly rainfall becomes runoff.

The completed amount and location of impervious area should be consistent with the approved stormwater analysis or properly addressed through approved revisions.

Construction changes that may affect drainage

Changes residents may notice

Lots appear higher than shown during public review
A pond appears smaller or shallower
A drainage pipe was relocated
A culvert opening appears smaller
A ditch was filled or narrowed
A berm redirects water toward existing homes
An overflow route is blocked by fill or construction
A new connection sends water into an older ditch
Water begins traveling in a new direction

Records that may explain the change

Engineering revision applications
Revised construction plans
Field-change approvals
Inspection reports
Surveyor field notes
Engineer certification letters
As-built plans
Permit modifications
Final acceptance records

Do not rely only on visual estimates. A pond may look smaller because of its shape, vegetation, water level, or viewing angle. A road may appear higher without a survey confirming the difference. Photographs can raise important questions, but elevations and dimensions should be verified through records and qualified measurements.

What does as-built certification mean?

Depending on the permit and project, a licensed professional may be required to certify that construction substantially conforms to the approved plans, permitted design, or applicable requirements.

Professional certification

A signed statement

A professional may certify the completed work based on surveys, inspections, records, measurements, and the applicable certification requirements.

Documented deviations

Changes should be identified

Certification may identify or address deviations from the permitted or approved plans, depending on the governing requirements.

Operation phase

Construction may transition

Stormwater permits may require completion and certification before the system moves into its long-term operation and maintenance phase.

Certification does not make the records beyond question. Residents can still request the supporting surveys, inspection reports, revisions, photographs, calculations, and correspondence used to document the completed project.

As-built plans are not the entire file

A full investigation should include the documents showing what was approved, what changed, what was inspected, and what was finally accepted.

Record	What it may show	Why it matters
Original approved plans	The project initially authorized for construction	Creates the design baseline
Approved revisions	Changes authorized during construction	Explains differences from the original design
As-built plans	The completed locations, dimensions, and elevations	Shows what was reportedly constructed
Inspection reports	Conditions observed by inspectors	Shows whether deficiencies were identified
Correction notices	Work that did not comply or required repair	Shows unresolved or corrected issues
Survey records	Measured elevations and locations	Supports the accuracy of the as-built plans
Final certification	Professional representation regarding completed work	Identifies who certified the final condition
Acceptance records	Government, HOA, district, or owner acceptance	May affect future maintenance responsibility
Operation and maintenance plan	How the completed system should be inspected and maintained	Identifies long-term responsibilities

What records should residents request?

The original approved site and engineering plans.
Request complete plan sets, not only selected pages.
All approved revisions.
Include revised grading, drainage, pond, utility, roadway, landscaping, and stormwater sheets.
The final as-built plan set.
Request every sheet, attachment, certification, and revision date.
Survey data supporting the as-builts.
Ask for field notes, elevation data, survey files, and related documentation when available.
Construction inspection records.
Include inspection dates, photographs, deficiency notices, correction records, and reinspection findings.
Engineering certifications.
Request signed and sealed certifications and any lists of deviations.
Stormwater permit records.
Include applications, calculations, modifications, certifications, operation approvals, and maintenance requirements.
Final acceptance and turnover documents.
Determine whether infrastructure was accepted by a government agency, HOA, community district, utility, or other entity.

Sample public-records request

I am requesting records related to the development known as [PROJECT NAME], located at [ADDRESS, PARCEL NUMBER, OR LOCATION].

Please provide:

1. The complete original approved site-development and engineering plan set.
2. All approved plan revisions, field changes, and engineering revision applications.
3. The complete final as-built or record-drawing plan set.
4. All as-built surveys, elevation data, surveyor notes, and supporting measurement records.
5. All stormwater, grading, drainage, roadway, pond, culvert, pipe, inlet, outlet, and overflow-route inspection records.
6. All deficiency notices, correction notices, reinspection records, and photographs.
7. All engineer, surveyor, or other professional certifications related to final construction.
8. All stormwater permit applications, modifications, certifications, and conversion-to-operation records.
9. All final acceptance, completion, turnover, warranty, and maintenance records.
10. Correspondence discussing differences between approved plans and completed construction.

Please provide the records electronically in their original format when available.

How residents can compare the plans

Start with the title blocks

Project name
Sheet number
Plan date
Revision dates
Engineer or surveyor name
Professional seal
Approval stamps
As-built or record-drawing notation

Confirm the plan versions

Original approved plans
Latest construction revision
Final approved revision
Final as-built set
Permit-modification set
Final certification date

Compare measurable details

Pipe diameter
Pipe length
Inlet elevation
Outlet elevation
Pond bottom elevation
Overflow elevation
Road and lot elevations
Distances from property lines

Compare actual conditions

Current photographs
Before-development photographs
Construction photographs
Floodwater direction
Standing-water locations
Visible structures
Erosion and sediment
Blocked overflow paths

Look for notes such as “field verified,” “record drawing,” “as-built,” or “contractor provided.” These terms may indicate different levels or sources of information. Residents should ask who measured each feature, when it was measured, and what records support the drawing.

Questions residents should ask

Questions about plan accuracy

Who prepared the as-built plans?
Who performed the field survey?
When were the measurements taken?
Were measurements taken before structures were covered?
Are the plans based on field survey or contractor information?
Were all drainage structures measured?
Were any areas inaccessible or estimated?
What deviations were identified?

Questions about government review

Which department reviewed the as-built plans?
Were differences from the approved plans identified?
Did any difference require a revised permit?
Were new drainage calculations required?
Were corrections ordered?
Was the project reinspected?
Who authorized final acceptance?
What conditions remain unresolved?

Questions about stormwater performance

Does the completed pond provide the required storage?
Do pipe elevations match the approved design?
Does the system drain in the intended direction?
Is the emergency overflow route intact?
Was current downstream capacity evaluated?
Were neighboring properties considered?
Does the final model match the completed construction?
Has the system been inspected after major rainfall?

Questions about future maintenance

Who owns each pond, pipe, culvert, and structure?
Who accepted maintenance responsibility?
Is there an operation and maintenance plan?
How often must the system be inspected?
Who keeps the inspection records?
Who corrects erosion or sediment buildup?
Who maintains drainage easements?
Who should residents contact when flooding occurs?

Warning signs that deserve closer review

Request a plan comparison when:

Flooding begins or worsens after construction.
Water travels in a direction not previously observed.
New fill appears substantially higher than surrounding homes.
A retention pond fills quickly or does not recover between storms.
A culvert or pipe repeatedly backs up.
An overflow route appears blocked or redirected.
Sediment repeatedly enters older neighborhood drainage.
Roads, ditches, or yards remain flooded after moderate rainfall.
The approved plan and visible construction appear different.
Agencies cannot identify the final accepted plan set.

Sample request for an engineering comparison

I am requesting a written comparison of the approved engineering plans, all approved revisions, and the final as-built plans for [PROJECT NAME].

Residents have observed [DESCRIBE FLOODING, DRAINAGE CHANGE, EROSION, STANDING WATER, OR OTHER CONDITION] near [LOCATION].

Please identify:

1. Every change between the original approved plans and the final as-built plans.
2. Whether each change was reviewed and approved.
3. Whether revised drainage calculations were required.
4. Whether pipe, culvert, pond, road, lot, and overflow elevations were field verified.
5. Whether the completed stormwater storage matches the approved design.
6. Whether the completed system connects to the downstream system as approved.
7. Whether inspectors identified deficiencies or required corrections.
8. Whether the project received final acceptance or conversion to its operation phase.
9. Which entity is now responsible for inspection and maintenance.
10. Whether an additional field inspection is recommended based on the reported flooding.

As-built plans can help answer important questions, but they are not proof by themselves that a system performs properly. A project may match its recorded plans and still experience a maintenance, capacity, design, groundwater, or downstream drainage problem. Flood history, inspections, rainfall records, surveys, and engineering analysis may also be needed.

The bottom line

Approved plans show what was supposed to be built. As-built plans should show what was actually constructed.

For stormwater systems, important details include ground elevations, road grades, pipe sizes, pipe slopes, culvert elevations, pond dimensions, outlet structures, drainage connections, and emergency overflow routes.

Request the original plans, every approved revision, the final as-built set, supporting surveys, inspection records, certifications, correction notices, and final acceptance documents. Then compare the records with current field conditions and the way water actually moves.

Brevard County Site-Plan Information Brevard County Public Works Engineering

Official resources and further reading

This page provides general public education. Required as-built documents, certification language, review procedures, and public-record availability depend on the project, jurisdiction, permit, approval date, and applicable regulations. A qualified engineer, surveyor, attorney, or other professional may be needed to evaluate a specific project or discrepancy.

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