Gauteng cost guide · Updated 27 August 2026
A supplementary CoC for a clearly defined, accessible and compliant addition or alteration typically uses the R900 to R1,900 inspection-and-certification planning range. The Electrical Installation Regulations require a CoC for at least an addition or alteration made to an installation that already had a certificate. The document must identify its real scope; it does not silently re-certify unrelated pre-existing work.
This is planning guidance. The final amount depends on the written scope, access, condition, materials, timing and work found necessary. Never treat a search-result price as a property-specific quotation.
Typically included
Usually separate
Why prices move
A better quote explains the variables instead of hiding them inside one number.
A labelled circuit and defined alteration are faster to verify than undocumented mixed work.
Closed ceilings, fixed cabinetry and trading premises can extend inspection time.
Missing identification, incorrect protection or poor terminations require correction before certification.
The new work must connect safely to the installation; upstream defects can affect the certification boundary.
Before you approve
Scope — the exact installation, points, circuits or areas covered.
Price components — attendance, labour, materials, testing and certification.
Exclusions — access, finishes, after-hours work and third-party repairs.
Approval rule — when additional work must be authorised.
Questions people ask
It documents an inspected and compliant addition or alteration to an installation that already has prior certification.
It normally sits with the earlier certificate and test report so the documents together describe the installation history.
Yes, where the electrical work and authority to inspect are clear. Landlord and lease requirements should also be checked.
Usually not. The range is for inspection, testing and certification of a suitable limited scope; defects are quoted separately.
Regulation 7(4) of the Electrical Installation Regulations requires a CoC for at least the addition or alteration where a certificate was previously issued.
Make the scope clearer
Include the suburb, property type, reason for the work, access constraints and safe photos where relevant.
Rate basis: Wesslink pricing register reviewed 28 July 2026; planning guidance reviewed 27 August 2026. VAT treatment, validity period and exact inclusions must be confirmed on the written quotation.