Movement Monitoring Survey for Architects: UK Guide
Movement monitoring surveys record and measure building movement or deformation during construction works — with accuracy as precise as ±1mm. Architects need to understand when monitoring is required and how to specify it.
Two Main Types
| Type | Description | Best For | | --- | --- | --- | | Automated monitoring | 24/7 continuous measurement with SMS/email alerts | High-risk or occupied buildings | | Manual monitoring | Surveyors attend site regularly (weekly/fortnightly) | Standard residential projects |
When Architects Need Movement Monitoring
| Work Type | Requires Monitoring | | --- | --- | | Basement excavation | Yes | | Underpinning | Yes | | Piling | Yes | | Demolition | Yes | | Cutting concrete slab from party wall | Yes | | Large extensions | Often required | | Loft conversions | Optional for small projects |
Monitoring is recommended under Section 6 of the Party Wall etc. Act 1996 for extensive works to protect adjoining owners.
Party Wall Requirements
- Party Wall Act 1996: Notify neighbours for work on or near shared property boundaries
- The Act is a civil matter — not enforced by local councils
- Schedule of Condition (pre-works record): £350 + VAT
- Monitoring tags installed on adjoining owner's property before work commences
Trigger Levels
| Movement | Category | Action | | --- | --- | --- | | 0–7mm | 🟢 Green | No action required | | 7–12mm | 🟡 Amber | Notify site manager, structural engineer, party wall surveyor | | 12mm+ | 🔴 Red | Cease all works immediately — remedial actions required |
Monitoring Schedule
- Before works: 2 base reading surveys
- Heavy works (underpinning, demolition, digging): Weekly readings
- Light works (fitting out): Monthly for 3 intervals post-heavy works
2025 UK Costs
| Project Type | Cost (ex VAT) | | --- | --- | | Small residential installation | £800 + VAT | | Small residential weekly visits | £300 + VAT per visit | | Major project | £3,000–£20,000+ | | Per visit (London/M25) | £354–£630 per visit |
Frequently Asked Questions
Q: Who installs monitoring tags?
The monitoring surveyor installs targets on the adjoining owner's property before work begins.
Q: What is the Schedule of Condition?
A pre-works record of the adjoining property's condition — £350 + VAT. Protects both parties.
Q: How long does monitoring last?
Typically through the heavy works phase — 3–6 months for residential basement projects.