2025 Survey Costs (ex VAT)
| Property | Standard | Fast Track (+25%) | Rush (+50%) | | --- | --- | --- | --- | | 2–3 bed | £400–£600 | £500–£750 | £600–£900 | | 4+ bed | £500–£800 | £625–£1,000 | £750–£1,200 | | Commercial | £800–£1,500 | £1,000–£1,875 | £1,200–£2,250 |
Survey Deliverables Reference
| Deliverable | Format | Use | | --- | --- | --- | | Floor plans | DWG + PDF | Design reference | | Elevations | DWG + PDF | Planning submission | | Sections | DWG + PDF | Building regulations | | Site plan | DWG + PDF | Planning boundary |
Laser Scanning vs SLAM Scanning: A Technical Comparison for Surveyors
Two scanning technologies dominate the market for 3D survey data: tripod-mounted laser scanning and SLAM-based mobile scanning. Both capture point clouds. Both can produce BIM models. But they differ significantly in how they work, what they capture, and when each is appropriate.
This technical comparison helps surveyors and construction professionals choose the right technology for their project.
What Is Tripod-Mounted Laser Scanning?
Tripod-mounted laser scanning — also called terrestrial laser scanning (TLS) — uses a scanner mounted on a tripod to capture point cloud data. The scanner emits laser pulses and records the returning signal to calculate distance. The scanner rotates 360 degrees, capturing all visible surfaces from each position.
Modern TLS scanners — Leica RTC360, FARO Focus, Z+F Imager — capture millions of points per second. Scan positions are established at regular intervals throughout the site. Each position captures a spherical view of the surrounding environment.
What Is SLAM Scanning?
SLAM — Simultaneous Localisation and Mapping — uses a mobile scanner that moves through the environment capturing data as it goes. SLAM scanners use the same laser ranging technology as TLS but without the tripod.
SLAM scanners — including the FJD Trion S1, Leica BLK2GO, and GeoSlam ZEB — build a point cloud by combining scanner positions with a SLAM algorithm that tracks position in real time. The scanner does not require setup at each position. It simply moves through the space.
Key Technical Differences
Setup and Positioning
TLS requires setup at each scan position. The tripod is levelled, the scanner is aligned, and the scan is initiated. Each position captures a complete spherical view. Setup takes around two minutes per position.
SLAM requires no setup. The scanner is carried or mounted on a pole or vehicle. Movement through the space is continuous. Setup time is minimal — essentially zero.
For small sites with few positions, TLS setup time is acceptable. For large sites or complex environments, SLAM eliminates setup time.
Point Cloud Quality
TLS produces high-quality point clouds with accurate geometry. Scanner positions are precisely controlled. Point cloud registration is based on target overlap or control points. Accuracy is consistent and verifiable.
SLAM point cloud quality depends on the SLAM algorithm and the environment. SLAM can drift — accumulating position error over distance. Environments with repetitive features — long corridors,货架 — cause additional drift. Post-processing corrects drift but reduces point cloud quality.
TLS point clouds are generally more accurate than SLAM point clouds, particularly for larger sites.
Indoor vs Outdoor Performance
TLS performs well in both indoor and outdoor environments. Outdoor scanning uses GPS or targets for positioning control.
SLAM performs best indoors where environments are constrained and GPS is unavailable. SLAM struggles outdoors where large open spaces reduce SLAM algorithm performance. Some SLAM scanners use GPS for outdoor positioning but accuracy degrades compared to indoor use.
Scan Speed
SLAM scanners capture data faster than TLS. A SLAM scanner moves continuously through a building, capturing data as it goes. A TLS scanner captures one position at a time.
For large indoor sites — warehouses, multi-floor buildings — SLAM can be significantly faster. For small sites or outdoor work, TLS speed is comparable.
When to Choose TLS
Choose TLS when:
Accuracy is critical: TLS produces more accurate point clouds. For heritage recording, structural verification, or precision engineering, TLS is the right choice.
Large outdoor sites: TLS integrates with GPS for accurate outdoor positioning over large areas.
Complex environments: SLAM algorithms struggle in repetitive or feature-poor environments. TLS works reliably in all environments.
Verification required: TLS positions are verifiable. SLAM drift is estimated and corrected but not independently verifiable.
When to Choose SLAM
Choose SLAM when:
Speed matters: SLAM is faster for large indoor sites. A warehouse scan that takes TLS hours takes SLAM a fraction of the time.
Access is limited: SLAM scanners can access spaces that are difficult for TLS setup — tight corridors, stairwells, complex layouts.
Large indoor sites: Multi-floor buildings, long corridors, large warehouses. SLAM captures these efficiently.
Budget is constrained: SLAM scanners have lower equipment costs. Surveyors pass these savings on.
Combined Approaches
The best approach for some projects combines TLS and SLAM:
TLS for primary control: High-accuracy TLS scans provide control points and reference geometry.
SLAM for rapid coverage: SLAM captures large volumes quickly within TLS control.
Integrated point cloud: TLS and SLAM data registered together in a single coordinate system.
Combined approaches leverage the strengths of each technology.
Cost Comparison
TLS and SLAM have different cost structures:
TLS equipment: Professional-grade TLS scanners cost significantly more than SLAM scanners. Equipment cost is amortised over surveys.
SLAM equipment: SLAM scanners are more affordable. Lower equipment cost reduces survey prices.
Operational cost: TLS requires more setup time per position. SLAM captures faster. Labour cost per site varies.
For most projects, the total cost — equipment, labour, processing — is comparable between TLS and SLAM. The choice should be driven by technical suitability, not cost.
Which Technology Does icelabz Use?
icelabz uses both TLS and SLAM scanners depending on project requirements. We select the technology best suited to each project.
For accuracy-critical projects, we use TLS. For rapid coverage of large indoor sites, we use SLAM. For combined projects, we use both.
Contact icelabz to discuss the right technology for your project.
Accuracy Specifications
TLS accuracy specifications:
Range accuracy: Around 1mm at 10m range for high-end scanners.
Angular accuracy: Around 19 arc-seconds for the best scanners.
Point accuracy: Around 2mm to 3mm at typical working ranges.
SLAM accuracy specifications:
Drift: Around 1cm to 3cm per 100m of travel, depending on the scanner and environment.
Post-processing correction: Drift can be corrected but accuracy is reduced after correction.
For most construction and BIM applications, both TLS and SLAM achieve sufficient accuracy. For precision applications, TLS is more reliable.
Point Cloud Density
TLS point density is controlled by scan resolution setting. Higher resolution captures more points but takes longer. Typical scan density is 25 to 100 points per square metre at working range.
SLAM point density depends on movement speed and scanner design. Dense SLAM scanners capture comparable point density to TLS. Sparser SLAM scanners may miss fine detail.
Specify point density requirements when commissioning scanning. TLS delivers consistent density. SLAM density varies with movement speed.
Registration and Control
TLS registration uses target overlap between scan positions or surveyed control points. Registration accuracy is verifiable by comparing target measurements before and after registration.
SLAM registration uses the SLAM algorithm to track position. Post-processing uses loop closure to correct drift. Registration accuracy is estimated but not independently verifiable in the same way as TLS.
For projects requiring verifiable accuracy, TLS is preferred.
Practical Considerations
Portability: SLAM scanners are portable. TLS scanners require tripod and setup. For sites with limited access, SLAM is more practical.
Battery life: SLAM scanners have limited battery life — typically 30 to 60 minutes. TLS scanners have longer battery life per charge.
Weight: SLAM scanners are lighter and more portable. TLS scanners are heavier but more stable.
Environmental conditions: Both work in typical indoor and outdoor conditions. Extreme temperatures, rain, or bright sunlight affect both technologies.
Fixed-Fee Scanning from icelabz
icelabz provides fixed-fee scanning using the appropriate technology for each project. TLS, SLAM, or combined approaches as required.
Contact icelabz with your project requirements for a fixed-fee quote. All scanning fixed-fee with no hidden charges. RICS-accredited surveyors with professional indemnity insurance. Point cloud data delivered in standard formats for BIM workflows. All scanning surveys include point cloud delivery in LAS or RCP format. Point cloud data compatible with AutoCAD, Revit, and Navisworks. Choose the right scanner for your project. icelabz advises on the right technology for each brief.