Combined Measured Building and Topographical Survey in Harrow: What You Need
A combined measured building and topographical survey merges two distinct survey types into a single coordinated dataset — from one site visit, one team, one integrated output. For Harrow projects requiring both internal and external existing conditions data, this is the most efficient approach.
What is a Combined Survey?
| Survey Type | What It Captures | | --- | --- | | Measured Building Survey | Internal dimensions, floor plans, wall positions, door and window locations, elevations, cross-sections, ceiling heights, roof plans | | Topographical Survey | External ground levels, contours, boundaries, trees, drainage, manholes, kerbs, site features, building footprints with heights |
The combined approach produces one coordinated dataset from a single team, eliminating inconsistencies and avoiding return site visits.
When to Use a Combined Survey in Harrow
You need both surveys (and should combine them) for:
- Planning applications involving extensions or change of use — requiring both site plan and existing building drawings
- Loft and basement conversions, rear, side, or wraparound extensions
- Listed Building Consent applications
- Commercial refurbishments or design projects
- Registering leases of 7+ years with HM Land Registry
- Party wall matters requiring Schedule of Condition
Combining saves 10–25% compared to separate commissions and reduces site disruption.
2025 Costs for Combined Surveys in Harrow
| Property Type | Cost (ex VAT) | Scope | | --- | --- | --- | | Small flat | £400–£600 | Basic floor plans only | | 3-bed house | £1,600–£2,200 | Floor plans, elevations, 2 sections, topo survey | | 6-bed house | £3,500+ | 5 floor plans, 4 elevations, 2 sections, roof plan | | Small site (≤0.25 acre) | £595+ | Topo survey only | | Medium site (0.25–1 acre) | £895–£1,200 | Topo survey only | | Commercial measured survey | £1,400+ | From |
London premium: 10–25% higher in Harrow due to ULEZ, congestion, and parking constraints.
Day rates: ~£500/day for measured survey; topo survey ~£500/day including drawings.
Standard Deliverables
| Deliverable | Format | Details | | --- | --- | --- | | 2D CAD drawings | .DWG, PDF | 1:50 or 1:100 scale | | Floor plans | All levels | Internal roof space if accessible | | External elevations | All sides | Architectural detail | | Cross-sections | 1–2 | Floor-to-ceiling heights | | External roof plan | 1:100 | Pitch, ridges, parapets | | Topographical site plan | 1:200 or 1:500 | Contours (0.5m or 1m interval), spot levels, boundaries | | Point cloud data | E57, LAS, RCP | From 3D laser scanning (optional) |
Frequently Asked Questions
Q: Should I combine or commission separately?
Combine if you need both surveys — saves 10–25% and eliminates inconsistencies between separate commissions.
Q: What accuracy is achieved?
RICS standards: ±20mm for measured building; ±10–20mm for topographical. Both from the same coordinate framework.
Q: How long does a combined survey take?
Single site visit (1–2 days on site depending on property size). Drawing delivery: 5–10 working days.
Q: What scale are drawings produced at?
1:50 or 1:100 for floor plans and elevations. 1:200 or 1:500 for topographical site plan.