Updated June 2026 — prices reflect 2026 market conditions
What Is Party Wall Monitoring?
Party wall monitoring (structural movement monitoring) precisely measures tiny movements in an adjoining owner's building before, during, and after construction works. It works alongside — but is separate from — the standard Party Wall Award process. The Award itself may mandate monitoring as a condition before works proceed.
What Triggers Monitoring
Monitoring is required for high-impact works posing significant risk to neighbouring structures:
- Basement excavations and underpinning
- Piling works
- Demolition near a party wall
- Cutting away reinforced concrete slabs
- Large engineering or infrastructure projects
Local councils also recommend monitoring as a condition when approving construction consent, particularly in London's dense urban environment.
How It Works
- Baseline survey — Reflective targets installed on adjoining property walls before works
- Control network — Off-site static targets established for millimetric precision via triangulation
- Regular readings — Total station records exact X, Y, Z coordinates at each visit (accuracy ±1mm)
- Data analysis — Results compared to baseline; reports track movement trends
- Trigger levels — Pre-agreed threshold; if exceeded, works stop until project team agrees action
- Post-completion — Readings continue after works end to confirm stability
Typical Costs (London 2025)
| Service | Cost (ex VAT) | | --- | --- | | Party Wall Notice | £80–£150/notice | | Schedule of Condition | £300–£600/property | | Party Wall Award | £700–£1,500/award | | Movement monitoring | Bespoke (per visit) | | Third Surveyor (disputes) | £200–£300/hr |
The building owner pays all party wall surveying costs — including the adjoining owner's surveyor fees.
Who Needs It
- Developers and building owners undertaking basement digs, demolitions, or piling in London
- Adjoining owners wanting independent protection and an evidential baseline
- Contractors and architects on projects where the Party Wall Award conditions monitoring
- Commercial clients on large-scale urban engineering near sensitive structures
Frequently Asked Questions
Q: Does every party wall job need monitoring?
No — loft conversions and standard rear extensions typically don't need monitoring. It is the deeper, heavier works that warrant it.
Q: Who pays for party wall monitoring in London?
The building owner carrying out the works pays — including the adjoining owner's surveyor fees.
Q: How often are monitoring readings taken?
Typically weekly during active works (excavation, underpinning), reducing after heavy phases. Your engineer sets the schedule.