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Spatial Dimensions is a UK measured building survey and geospatial company producing independent construction verification reports from permanent offices in London, Sevenoaks and Nottingham, with survey teams working on construction sites nationwide.
A construction verification report checks that what has been built matches what was designed. Spatial Dimensions laser scans the built work — a frame, a slab, a facade, a cladding system — and cross-references the real-world geometry against the original design parameters. You see the result visually and statistically: a colour-coded variance heatmap showing where the built work sits within tolerance and where it does not, backed by as-built drawings and records.
In short: a construction verification report from Spatial Dimensions is an independent as-built check, produced by laser scanning the built work and comparing it against the design model or construction issue drawings. It identifies conflicts and discrepancies while they are still easy to fix, provides compliance evidence, gives you confidence in subcontractors’ work, supports accurate valuations and minimises the risk of claims and disputes. Reports start at £850.
or call 01732 458799
What is construction verification?
Construction verification is the checking of as-built conditions against design information on a construction project. Registered laser scans — scans tied together on the project coordinate system — are compared with the design model or the construction issue drawings (the drawings the work was built from), and the match is reported visually and statistically.
Verification has grown quickly for two reasons: clients increasingly expect reliable, evidence-based information about build quality, and laser scanning and BIM have made rigorous checking practical. Spatial Dimensions was founded in 2012 and has produced 3D models from laser scan data for nearly 15 years, so the comparison between scan and design model is handled entirely in-house, from site capture to signed-off report.
Verification answers a point-in-time question: does the built work match the design today? If you need to track movement or deformation over time, that is a monitoring survey, and Spatial Dimensions will tell you plainly which of the two your project needs.
How does a construction verification survey work?
The process has four steps.
- Scan the built element. A Spatial Dimensions surveyor captures the work with Leica RTC360 and P-series laser scanners, recording millions of measured points quickly and from a safe distance so a live site is not held up — the same capture method as our laser scanning surveys.
- Tie the scans to control. The scans are registered on a closed-loop control network with redundant observations, anchored to Ordnance Survey benchmarks unless you ask for a local site grid. Where Spatial Dimensions also provides the setting out, verification uses the same control the work was set out from, so design and as-built are compared on one coordinate system, not two.
- Compare against the design. The point cloud is cross-referenced against the design model or construction issue drawings, measuring how far every surveyed surface sits from where the design says it should be.
- Report. You receive a variance heatmap, a statistical summary of the deviations, and as-built drawings and records.
The heatmap uses a traffic-light convention — green within the agreed tolerance, amber close to the limit, red outside it — with each colour tied to a stated deviation range, so the picture and the numbers agree.
What does a construction verification report include?
Swipe the table sideways to see all the columns.
| Deliverable | Format | What it is |
|---|---|---|
| Variance heatmap | Image / 3D view | Colour-coded comparison of built work against the design model — compliant and non-compliant areas at a glance |
| Compliance report | Statistical summary of deviations against the agreed tolerance — a compliance log for the project record | |
| As-built drawings and records | .DWG / .PDF | Plans, elevations and sections of the work as actually built |
| Point cloud | .RCS / .RCP / .E57 | The measured dataset itself, reusable by your design team |
| As-built BIM model | .RVT / .IFC | Optional — a parametric Revit model of the as-built structure, in your exact Revit version (see 3D models) |
Once full payment clears you receive a permanent licence to use the data, and every project is securely archived — so a verification scan at a later hold point integrates with the original dataset.
When should construction verification happen?
The most valuable time to verify is before the next trade covers the work up. Spatial Dimensions carries out verification surveys at agreed hold points during construction — a frame before it is clad, a slab before fit-out, cladding before handover — and at completion, fully documenting the build process stage by stage. An error found at a hold point is a correction; found at handover, it is a claim.
Regulation is moving the same way. The Building Safety Act 2022, introduced after the Grenfell Tower tragedy of 2017, requires higher-risk buildings — those of 18 metres or more in height, or at least seven storeys — to maintain a golden thread of building information. Gateway 3, active since October 2023, is the final checkpoint before those buildings can be occupied. Independent verification reports from Spatial Dimensions provide exactly the kind of dated, objective digital documentation this regime expects, in formats that sit naturally in the golden thread record.
Why does independent verification matter?
Because a check is only as reliable as the independence of the person making it. An independent report from Spatial Dimensions gives the whole project team the same objective facts, rather than the installer marking their own work — and a record that stands up if anything is ever disputed.
That independence is backed by checkable credentials. Spatial Dimensions is certified to ISO 9001:2015, with separate checking teams on every deliverable — the person who prepares your report is never the person who signs it off. We carry £10 million of professional indemnity insurance with zero claims to date, plus £10 million each of public and employers liability, and hold Constructionline Gold and Acclaim (SSIP) accreditation. We are a corporate member of The Survey Association, and our Managing Director, Claire Fenwick, is the TSA’s current President.
Our Survey Buyers Guide, free to download from our guides page, sets out ten checks to apply to any survey quote, including ours.
Who commissions construction verification reports?
Main contractors, project managers, quantity surveyors, engineers, and clients or funders who need evidence behind stage payments.
- Main contractors — confidence in subcontract packages at handover, and a growing as-built record
- Project managers and quantity surveyors — objective evidence for accurate valuations and change control
- Engineers — confirmation that structural elements are within tolerance before the next stage loads them
- Clients and funders — independent compliance evidence for evaluations, payments and the building safety record
Spatial Dimensions survey teams are deployed for contracting and engineering names including Willmott Dixon, Kier, BAM, Vinci Construction, Farrans, Bowmer & Kirkland, Mears Group and Bauvill, alongside engineering practices Arup, Fairhurst and CampbellReith. Our resource pages for contractors and for consultants show how verification fits alongside the rest of the survey programme.
How long does a construction verification survey take?
Spatial Dimensions mobilises to site in an average of 5.3 working days from instruction — tell us your programme dates at enquiry stage and we plan hold-point visits around them. Laser scanning is fast even on large or complex structures, and we often put multiple technicians on one project to speed the turnaround.
Reporting time depends on the size and number of elements being verified and whether a current design model already exists. Your quotation states the timescale before we start.
How much does a construction verification report cost?
A construction verification report from Spatial Dimensions starts at £850. Most construction verification reports fall between £850 and £2,500, depending on how many elements are verified and whether you need a one-off check or repeat visits.
The price depends on: the number and size of elements to verify, the tolerance being checked, whether an up-to-date design model exists, whether you need a one-off completion check or repeat hold-point visits, and site access.
Spatial Dimensions quotes a fixed price against a written specification, so you know exactly what is being verified, to what tolerance, and what you will receive.
For a fixed price, send us the site address, what needs verifying and to what tolerance. We will come back with a written quote within 24 hours. All prices exclude VAT.
or call 01732 458799
Frequently asked questions
Construction verification is an independent check that built work matches the design. Spatial Dimensions laser scans the as-built structure and cross-references the measured geometry against the design model or construction issue drawings, reporting the results as a variance heatmap with a statistical summary and as-built records.
A variance heatmap is a colour-coded comparison showing where built work deviates from the design: green is within the agreed tolerance, amber is close to the limit, red is outside it. Each colour is tied to a stated deviation range, so the team can see at a glance which areas need resolving and by how much.
At agreed hold points during construction and at completion. Checking work before the next trade covers it catches discrepancies while they are simple to correct; verification at completion gives you the as-built record for handover and the building safety file.
Yes. Comparing as-built laser scans against the original design parameters generates a compliance log that helps minimise change-order claims, and the report is an objective, dated record of what was built — evidence that supports valuations and dispute resolution, or litigation if it ever comes to that.
Yes. Main contractors regularly commission Spatial Dimensions to verify subcontract packages — steelwork, slabs, facades, cladding — before sign-off or valuation. An independent check gives you confidence in the work without relying on the installer’s own measurements.
A variance heatmap, a compliance report summarising deviations against the agreed tolerance, and as-built drawings and records. The point cloud is included in standard formats, an as-built BIM model is available on request, and on full payment you receive a permanent licence to use all of it.
Request a construction verification quote
Send us the site address, what needs verifying, the tolerance it must meet and your programme dates; Spatial Dimensions will reply with a written, fixed-price quote within 24 hours.
Email: website@spatial-dimensions.co.uk
Phone: 01732 458799
Offices: London · Sevenoaks · Nottingham · working nationwide
Related services
- Laser scanning surveys — the capture method behind every verification report
- Setting out surveys — transferring the design to site on the same control network verification uses
- Monitoring surveys — tracking movement and deformation over time
- Measured building surveys — full as-built surveys of existing buildings
- 3D models — as-built BIM models produced from the verification point cloud
