As built survey of installed piles — verifying positions, levels and tolerances against the structural design drawings.
What Our As Built Surveys Cover
Our as built surveys capture the constructed position of structural and architectural elements using Leica total stations and 3D laser scanning — providing verified data for QA, tolerance checks, compliance and handover records.
Structural grids & primary control
Gridlines and control stations verified against design to confirm the frame is in the correct position.
Foundations & substructure
Foundations, piles, pile caps and ground beams measured against design for compliance and record purposes.
Frames, cores & structural walls
Columns, RC frames and core walls surveyed to confirm geometry, position and plumb.
Slabs, levels & soffits
FFL, slab edges and soffit levels recorded to support cladding, partitions and MEP trades.
Façades & external envelopes
Cladding lines and curtain walling surveyed for elevation checks and tolerance control.
Internal layouts & openings
Partitions, room layouts and openings captured and compared against approved drawings.
External works & hard landscaping
Kerbs, roads and hard landscaping measured as built for drainage, access and completion records.
Visible services & MEP plant
MEP routes and plant locations captured to support coordination, record drawings and future maintenance.
All as built data is tied to the agreed coordinate system — OS grid, site grid or structural grid — and delivered in formats ready for QA, BIM and handover.
As Built Survey Workflow
Scope & Requirements
We define the elements to be checked, design drawings to compare against, required tolerances, coordinate system and deliverables with your team.
On-Site As Built Survey
Our surveyors establish control and capture as built data using Leica total stations and 3D laser scanning, working efficiently around live construction activities.
Data Processing & Comparison
Measurements are processed into as built CAD drawings and models, then overlaid against design information to highlight variances and tolerance issues.
Deliverables Issued
DWG as built drawings, scaled PDFs, variance reports and BIM-ready models issued — clean, coordinated and ready for QA, building control and handover.
Sheet pile as built survey drawing showing easting and northing positional deviations and top-of-pile level checks against design tolerances.
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Applications of Our As Built Survey Services
Our as built surveys are used across a wide range of construction, refurbishment and handover scenarios, including:
Construction quality assurance
Objective evidence that structural and architectural elements have been built within specified tolerances and align with construction drawings.
Verification of frames & substructure
Piles, RC frames, steel frames, cores and substructure checked as built before cladding, façades and fit-out proceed.
Fit-out, façades & services coordination
As built floor levels, slab edges, walls and openings support façade installation, partition setting-out and MEP coordination.
Compliance, sign-off & building control
As built drawings and reports support building control submissions, completion certificates, O&M manuals and health and safety files.
Record drawings & asset management
Reliable records for landlords, building owners and facilities managers planning future fit-out, maintenance or refurbishment.
BIM updates & digital handover
As built data used to update BIM models and digital twins so design-intent models reflect what has actually been constructed.
Periodic scanning for site progress
Regular 3D laser scanning at key construction stages to record progress, compare against programme milestones and provide a permanent, timestamped site record.
Floor flatness & surface verification
3D scanning of completed slabs and floor surfaces to check flatness, level tolerances and surface regularity — suitable for industrial floors, podium decks and warehouse slabs.
Accurate as built survey information reduces disputes, supports claims and provides a long-term record of completed construction.
As Built Survey Output Standards
All as built outputs are professionally structured for immediate use by contractors, architects, engineers and building control teams.
DWG & PDF as built deliverables
GA plans, elevations and sections issued in DWG with scaled PDF plots for easy review by project teams and stakeholders.
Appropriate drawing scales
Scales such as 1:50, 1:100 or 1:200 selected to suit structural verification, fit-out and record drawing requirements.
Clear layering & annotation
Structured layering, line work, grid references and annotation so drawings can be used directly in CAD and BIM workflows.
Variance & tolerance reporting
Optional variance reports and highlighted overlays showing differences between as built results and design or IFC drawings.
Coordinate systems & reference grids
Surveys related to OS grid, site grid or structural grid for setting-out, coordination and future survey work.
Registered point clouds
Where 3D laser scanning is used, fully registered E57 or RCP point clouds are delivered alongside CAD drawings — enabling deviation analysis, BIM updates and a permanent digital record of the constructed state.
BIM-ready models & IFC export
As built data delivered as Revit models or IFC files where required — structured to reflect constructed geometry and ready for integration into live BIM workflows.
Internal quality checks
Internal checks on control, levels and measurements on every project — no exceptions.
Outputs are suitable for QA documentation, construction verification, BIM updates and long-term record information.
As built survey of a steel structure carried out on site — capturing beam and column positions against design grids and levels.
Why Clients Choose Us as Their As Built Surveyor
Construction verification expertise
Specialist experience in as built surveys, tolerance checks and construction verification on live projects.
CAD & BIM-ready outputs
Structured DWG files and BIM-ready as built models that drop straight into architects' and engineers' workflows.
Consistent methodology & QA
Defined process across control, capture, processing and quality review on every project.
Fast mobilisation & reliable delivery
Quick to mobilise, with delivery timed to your programme and handover dates.
Transparent, competitive pricing
Clear fees based on defined scope — no hidden costs, no surprises.
Practical site knowledge
We understand how contractors, engineers and designers use as built data for QA, sign-off and future works.
A dedicated as built survey partner — accurate, verifiable data that can be relied on throughout the construction lifecycle.
Transparent Fees.
No Surprises.
Every project is priced individually — fairly and transparently. You know the full cost before we arrive on site.
Fees reflect project location, structure type, construction complexity, required tolerances and the level of as built documentation needed — ensuring a competitive and fair quotation every time.
- Fixed price agreed before mobilisation
- Priced on scope — not a day rate
- Like-for-like quote matching available
- No hidden fees or surprises
Flexible survey scheduling to support construction programmes and handover dates — with fast mobilisation across London and the South East.
- Short-notice & next-day appointments
- Delivery aligned with milestones & handover dates
- Flexible scheduling around your programme
- Free no-obligation quote within 24 hours
Frequently Asked Questions
A measured building survey records the existing condition of a building, typically for design, planning or refurbishment purposes. An as-built survey is carried out during or after construction to verify that what has been built matches the design — checking positions, levels and tolerances against approved drawings. The focus is on construction verification and QA rather than capturing a building as it stands.
As-built surveys are most valuable at key construction milestones — after piling and groundworks, after the structural frame reaches each level, before cladding or façade installation, and at practical completion for handover records. Early verification identifies tolerance issues before they affect follow-on trades, avoiding costly rework later in the programme.
Yes — for complex structures, tight tolerances or where a comprehensive as-built record is required, we use Leica 3D laser scanners alongside total stations. Scanning captures the full geometry of the constructed elements in a single pass, enabling deviation analysis against design models and producing a permanent, millimetre-accurate digital record. For more straightforward verification tasks, total station measurements alone are often sufficient — we advise the most appropriate approach for each project.
Yes — where design DWG or BIM files are provided, we overlay the as-built survey data against the design intent and produce a variance report highlighting any elements outside the specified tolerances. This gives the project team a clear, visual picture of what is in tolerance and what requires attention, in a format suitable for QA records, building control and contractor sign-off.
Yes — as-built survey data, including point clouds and verified CAD drawings, can be used to update Revit and other BIM models so that they accurately reflect the constructed building rather than the design intent. This is particularly valuable for digital handover, O&M documentation and facilities management workflows where the model needs to represent what was actually built.
We typically deliver DWG as-built drawings, scaled PDFs and, where applicable, variance reports and BIM-ready models. All outputs are tied to the agreed coordinate system and produced to a standard suitable for building control submissions, completion certificates, O&M manuals and health and safety files. Specific formats and content are agreed at the scoping stage to ensure the deliverables meet your project requirements.
Schedule Your As Built Survey
Send your drawings and a brief scope — we will return a clear, fixed-price quotation within 24 hours. No commitment required.