Topographical Surveys: When You Need One and What They Cost

A topographical survey is the geometric foundation of any design. Without one, drawings start from assumption and end in surprise during groundworks.

What a topo survey shows

• Existing levels (contours and spot heights)
• Trees and vegetation
• Buildings, walls, fences, drives
• Manholes, gulleys, drainage features
• Services (above ground; below requires utility survey)
• Boundary features

When required

• New build dwellings (always)
• Larger extensions where level changes matter
• Sloping sites
• Sites with drainage challenges
• Planning submissions where existing/proposed levels must match
• Commercial development

Accuracy classes

• Standard (Class C): ±50mm — most domestic
• Class B: ±25mm — commercial
• Class A: ±10mm — precise engineering
• Class AA: ±5mm — monitoring, deformation

Cost

• Domestic plot (under 500m²): R8,000–R16,000
• Larger residential (up to 2000m²): R16,000–R36,000
• Commercial site (1 hectare): R30,000–R90,000
• Large industrial: R80,000–R300,000+

Survey methods

• Total station: traditional, accurate
• GPS/GNSS: fast for open sites
• Drone photogrammetry: large open areas, fast
• 3D laser scanning: complex existing buildings

Buried services

Topo surveys typically don't trace buried services. Separate utility survey (R10,000–R40,000) uses electromagnetic and GPR detection. Always commission if excavating below ground.

MCFAR commissions topo and utility surveys as part of project setup.

Frequently Asked Questions