As-Built Survey in Islington: What You Need
An as-built measured building survey in Islington (N1, N5, N7) is a precise record of a building's completed layout and structural features — typically delivered as 2D CAD drawings and or 3D point clouds or BIM models.
What Is Included in an As-Built Measured Building Survey
| Component | Details | | --- | --- | | Floor plans | Structural walls, door swings, window positions, sill and head heights, floor levels, sanitary equipment, columns | | External elevations | Window and door placements, roof lines, rainwater goods, external finishes | | Sections | Floor-to-ceiling heights, floor thicknesses, staircase profiles, roof structures | | Roof plans | Ridges, valleys, pitches, parapets, chimneys, skylights | | Reflected ceiling plans (RCP) | Lighting layouts, exposed beams, bulkheads, HVAC elements (if requested) | | 3D point cloud | Millions of data points at ±2mm accuracy in formats like RCP, E57, FLS, PTS and PTX |
Surveys use 3D laser scanning (e.g., Leica RTC360) capturing up to 1 million points per second.
2025 Costs in Islington and N1/N5/N7
| Property Type | Cost (ex VAT) | Notes | | --- | --- | --- | | Small residential (2–3 bed, extension) | £800–£2,000 | Basic 2D floor plans and elevations | | Medium residential (large house, full survey) | £1,500–£3,500 | Includes sections and roof plan | | 3-bed house example | £1,750 | 2D plans (2), elevations (4) | | 4-bed house example | £2,100 | Adds loft plan, 1 section | | Commercial office (500m²) | £3,500–£5,000 | Full point cloud plus 2D plans | | Islington starting price | £500–£3,000+ | Depends on size, complexity, output | | London premium | +10–20% | Congestion, ULEZ, parking, demand |
Pricing factors: building size (GIA), complexity, internal vs. external scope, required Level of Detail (LOD), occupancy, and urgency (express adds 20–50%).
Standard Deliverables
| Format | Contents | | --- | --- | | 2D CAD drawings | DWG and PDF: floor plans, elevations, sections, roof and ceiling plans | | 3D point cloud | RCP (AutoCAD and Revit), E57 (vendor-neutral), FLS (Faro Scene), PTS and PTX (Leica) | | 3D BIM model | Revit RVT file, LOD 200–300+ (object-based, intelligent) | | Turnaround | 3–5 working days standard; 24–72 hours for rapid (+40–50%) |
When You Need an As-Built Survey in Islington
| Project | Survey Required? | | --- | --- | | Planning permission | Yes — required by Islington Council for extensions and conversions | | House extension | Yes — accurate existing drawings for design | | Loft conversion | Yes — floor plans, sections, roof geometry | | Property sale or purchase | Only if property is unusual or complex | | BIM or digital twin | Yes — measured data for modelling | | Building regulations compliance | Yes — as-built record of completed works | | Heritage or listed buildings | Yes — detailed recording of historic fabric |
Frequently Asked Questions
Q: What accuracy is achieved on a measured building survey in Islington?
±10mm for manual measured surveys. ±2mm for laser-scanned surveys using Leica RTC360 or equivalent.
Q: What scale are drawings produced at?
1:50 for detailed design work. 1:100 for planning applications. Confirm with your architect or Islington Council planning department.
Q: How long does the survey take?
Site visit: 1–4 hours depending on property size. Drawing delivery: 3–7 working days. Express turnaround available with premium.
Q: Do I need a point cloud or just CAD drawings?
CAD drawings are sufficient for most projects. Point cloud data is useful for complex geometry, heritage projects, or if your team has in-house Revit modelling capability.
Q: What file formats will I receive?
AutoCAD DWG (editable) plus PDF. Revit RVT for BIM projects. Point cloud data in E57, RCP, or FLS formats.