As Built Survey

Definition and Purpose

An as built survey is a comprehensive measurement and documentation process performed upon completion of construction, renovation, or installation projects. This survey verifies that all constructed elements conform to approved plans and specifications, capturing the actual final condition of the work performed. The primary purpose is to create an accurate record of what was actually built, which may differ from the original design documents.

Key Objectives

The main objectives of as built surveys include:

Verification of Compliance: Confirming that construction meets design specifications and building codes

Accurate Documentation: Creating precise records for future reference, maintenance, and modifications

Conflict Resolution: Identifying discrepancies between planned and executed work

Regulatory Requirements: Meeting legal and contractual obligations for project completion

Facility Management: Providing essential data for building operations and maintenance

Survey Methodology

Professional surveyors employ various techniques to conduct as built surveys:

Traditional Methods

Tape and chain measurements for dimensional verification

Transit and level instruments for elevation checks

Manual notation and sketching of existing conditions

Modern Technology

3D Laser Scanning: Captures precise point cloud data of complex structures

GPS/GNSS: Provides high-accuracy horizontal and vertical positioning

Drones: Enables aerial documentation of large areas and building exteriors

BIM Integration: Creates Building Information Models for comprehensive asset documentation

Common Applications

As built surveys are essential for numerous project types:

Building Construction: Verifying structural elements, mechanical systems, and finishes

Infrastructure Projects: Documenting roads, utilities, and drainage systems

Renovation Work: Recording modifications and alterations to existing structures

Landscape Projects: Measuring grading, drainage, and hardscape installations

Mechanical Systems: Verifying HVAC, plumbing, and electrical installations

Deliverables

Typical as built survey deliverables include:

Marked-up Plans: Original drawings annotated with actual measurements and changes

Survey Reports: Detailed documentation of findings and any discrepancies

Digital Models: CAD drawings or BIM files reflecting actual construction

Photographic Documentation: Visual records of completed work

Certifications: Professional seal confirming survey accuracy and compliance

Importance in Project Management

As built surveys provide critical value throughout a project lifecycle. They establish baseline data for warranty claims, facilitate future renovations, support maintenance planning, and create legal documentation of work completion. These surveys are particularly valuable when original plans were modified during construction, which is common on complex projects.

Regulatory and Contractual Context

Many construction contracts explicitly require as built surveys before final payment. Building departments and regulatory agencies often require these surveys for permit closeout and occupancy certification. Professional liability insurance frequently mandates as built documentation for verification purposes.

Quality Assurance

Accurate as built surveys require qualified surveyors with proper licensure and equipment calibration. The surveying profession maintains strict standards ensuring accuracy and reliability of measurements, typically to within specific tolerances depending on project requirements.

Conclusion

As built surveys represent an essential component of modern construction project completion. By documenting actual conditions and verifying compliance with specifications, these surveys protect all project stakeholders, facilitate future building management, and create accurate historical records of constructed assets.