iPhone LiDAR Accuracy: The Numbers
iPhone LiDAR accuracy varies significantly by model and range. Testing of iPhone 15 Pro and 16 Pro shows mean errors of 0.1–0.5% up to 10 metres, but accuracy collapses beyond that — error jumps to ~12–25% past 10.9 m.
For room-scale indoor scans, iPhone 13 Pro achieves approximately ±3 cm horizontally and ±7 mm vertically. Key limiting factor is drift — positional errors compound as you move through larger spaces.
Apps like Polycam, Canvas, and MAGICPLAN improve the raw sensor output considerably. Cloud-based post-processing can bring accuracy to within ±12 mm (half an inch).
When iPhone LiDAR Is Good Enough
These use cases play to its strengths:
- Pre-visit site assessments — understanding layout and access before committing to a full survey
- Space planning and material estimating — furniture placement, room dimensions for residential work
- As-built documentation for simple, small spaces where ±5–10 cm tolerance is acceptable
- Client walkthroughs and visual models — communicating scope, not precision
- Quick quantity take-off checks — cross-checking gross areas
- Early-stage feasibility — getting a feel for a site without mobilising survey teams
When You Need Professional Scanning
| Scenario | Why iPhone Falls Short | | --- | --- | | Structural/MEP as-builts for BIM (LOD 300+) | Drift over large spaces; ±100 mm isn't buildable | | NEC4/JCT contract measurement disputes | Data must be defensible and verifiable | | Heritage and listed building surveys | Sub-mm detail of mouldings and fabric | | Large industrial/plant/infrastructure | Range degrades badly beyond 10 m | | Clash detection in Revit/IFC workflows | Tolerance for M&E coordination is ±5–10 mm | | Measured building surveys for planning/RIBA | Requires RICS-grade accuracy and indemnified deliverables |
Professional kit — Leica RTC360, FARO Focus, Trimble X7 — uses phase-based or time-of-flight LiDAR with consistent sub-5mm accuracy at all ranges.
Side-by-Side Comparison
| Factor | iPhone/Smartphone LiDAR | Professional Scanner | | --- | --- | --- | | Accuracy at 5m | ±3–7 cm (room scale) | ±2–5 mm | | Accuracy at 10m+ | ±12–25% error (collapses) | ±5–10 mm | | Range | Limited to ~10 m effective | Up to 130–350 m | | Drift | Compounds with distance | Controlled by georeferencing | | BIM-ready | No (point cloud only) | Yes (.e57, .rcp, .rvt) | | Professional indemnity | No | Yes | | Cost | Free (iPhone 12 Pro+) | £800–£2,000/day |
Frequently Asked Questions
Q: How accurate is iPhone LiDAR?
Approximately ±3 cm horizontally and ±7 mm vertically for room-scale scans. Accuracy collapses beyond 10 m range. Professional scanners achieve ±2–5 mm at all distances.
Q: When is iPhone LiDAR good enough for QS work?
For pre-visit site assessments, rough quantity take-off estimates, space planning, and early feasibility. Not suitable for anything that will be used in formal contract documentation, BIM coordination, or measurement disputes.
Q: Can I use iPhone LiDAR for planning applications?
No — planning submissions require scaled drawings with verifiable accuracy. iPhone LiDAR drift makes it unsuitable for formal submission drawings.
Q: What does professional 3D scanning cost?
Professional scanning services: £800–£2,000/day for on-site work. iPhone LiDAR apps: free (Polycam free tier, Matterport from ~£9/month).