Structural Movement Monitoring in Ealing, London
Structural movement monitoring is required for notifiable works under the Party Wall etc. Act 1996 — particularly basement excavations, piling, underpinning, demolition, and large extensions near adjoining properties.
Key trigger: Excavation within 3m of a neighbour's foundation (if going deeper) or within 6m (if going below the 45° line from the foundation).
When It's Needed
| Work Type | When Required | | --- | --- | | Basement excavations | Deep excavation near neighbours (within 3–6m) | | Piling works | Any pile foundation work | | Underpinning | Foundation strengthening | | Demolition | Full or partial demolition | | Extensions | Large structural extensions | | Party wall works | Cutting slabs, thickening walls, inserting beams |
Costs in Ealing (2025)
| Service Level | Price (ex VAT) | | --- | --- | | Small residential installation | £800 | | Weekly visit (small project) | £300 per visit | | Initial inspection visit | £75–£125 | | Visit with report | £354–£630 per visit | | Full project (typical range) | £3,000–£20,000+ |
Factors affecting cost: Project size, number of monitoring tags, duration of works, visit frequency.
Deliverables
- Initial schedule of condition (pre-works baseline with photographs)
- Monitoring targets and tags installed on adjoining property (front, rear, flank walls)
- Regular measurement reports (typically weekly, ±1mm accuracy)
- Trigger level alerts (1–3mm movement thresholds, with SMS/email alerts for automated systems)
- Final report confirming movement has ceased or documenting trends
- Data formats: Spreadsheets, 3D digital models, online secure portals
- Burland Scale damage assessment (if required for planning)
Turnaround Time
| Aspect | Timeline | | --- | --- | | Engineer deployment | Within 7 days (ASAP basis available) | | Report delivery | Timely after each visit (often same day or 24–48 hours) | | Monitoring duration | Typically 3 months to 1 year (through construction + post-completion) | | Visit frequency | Weekly during critical phases (more frequent for high-risk works) | | Real-time option | Automated 24/7 monitoring available (premium cost) |
Ealing Coverage
We provide monitoring surveys throughout the London Borough of Ealing — including Ealing, Acton, Hanwell, Northolt, Perivale, Southall, Greenford, West Acton, East Acton, Brentford, and all surrounding W, NW, and UB postcode areas.
Frequently Asked Questions
Q: When do I need monitoring in Ealing?
Monitoring is typically required when Party Wall awards specify monitoring of adjacent properties, when planning conditions require it, or when visible defects suggest subsidence or structural movement. Ealing's mix of Victorian and Edwardian properties often requires careful monitoring during adjacent works.
Q: What accuracy can I expect?
Modern monitoring achieves ±1mm accuracy using total stations. Trigger levels are typically set at 1–3mm movement thresholds.
Q: How long does monitoring continue?
Monitoring typically runs for the duration of the adjacent works plus a post-works period. Basement projects often require 6–12 months. Confirm the programme with your structural engineer.
Q: What triggers a stop-work alert?
Trigger values are agreed in advance with your structural engineer. If readings exceed these thresholds, you receive an immediate alert so works can be paused and mitigation measures implemented.